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Protective Functions of Reactive Astrocytes Following Central Nervous System Insult

Mathias Linnerbauer, Veit Rothhammer

Frontiers in Immunology · 2020 · Review · CC BY

doi:10.3389/fimmu.2020.573256 (opens in a new tab)

Abstract

Astrocytes play important roles in numerous central nervous system disorders including autoimmune inflammatory, hypoxic, and degenerative diseases such as Multiple Sclerosis, ischemic stroke, and Alzheimer's disease. Depending on the spatial and temporal context, activated astrocytes may contribute to the pathogenesis, progression, and recovery of disease. Recent progress in the dissection of transcriptional responses to varying forms of central nervous system insult has shed light on the mechanisms that govern the complexity of reactive astrocyte functions. While a large body of research focuses on the pathogenic effects of reactive astrocytes, little is known about how they limit inflammation and contribute to tissue regeneration. However, these protective astrocyte pathways might be of relevance for the understanding of the underlying pathology in disease and may lead to novel targeted approaches to treat autoimmune inflammatory and degenerative disorders of the central nervous system. In this review article, we have revisited the emerging concept of protective astrocyte functions and discuss their role in the recovery from inflammatory and ischemic disease as well as their role in degenerative disorders. Focusing on soluble astrocyte derived mediators, we aggregate the existing knowledge on astrocyte functions in the maintenance of homeostasis as well as their reparative and tissue-protective function after acute lesions and in neurodegenerative disorders. Finally, we give an outlook of how these mediators may guide future therapeutic strategies to tackle yet untreatable disorders of the central nervous system.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 20, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

Astrocytes are the most abundant cell type in the mammalian central nervous system (CNS) and responsible for a multitude of functions. During development, astrocytes arise from neural stem cells (NSCs) in the subventricular zone (SVZ) and migrate along radial glia processes to populate the CNS. Once their migration is complete, astrocytes differentiate into subgroups with a high degree of functional and regional specialization. During postnatal development, astrocytes instruct the formation of excitatory and inhibitory synapses, support developmental myelination, and aid the establishment of complex neural circuitry through the secretion of soluble factors and physical cell contact. Throughout adulthood, astrocytes form close interactions with neurons to provide structural support and engage in metabolic coupling, serving as nutrient source and storage for neurons ( Figures 1A, B ). Particularly lactate produced by astrocytes has been demonstrated to play an important role in the modulation of neuronal excitability and plasticity. Furthermore, astrocytes actively take part in synaptic transmission and have been shown to modulate cognitive functions through the clearance of neurotransmitter and other extracellular factors ( Figure 1B ). In this context, the inward rectifying K+ channel Kir4.1 has gained attention as part of a K+ spatial buffering system that is required for neuronal transmission and functioning ( Figure 1B ). Kir4.1 is highly expressed in astrocytic endfeet, and its misregulation has been linked to numerous neurological disorders.

Besides their versatile role during neurogenesis and their contribution to the maintenance of neuronal circuitry, astrocytes are key participants in the formation and maintenance of the blood brain barrier (BBB) ( Figure 1C ). During CNS angiogenesis, astrocytes extend their polarized endfeet around the abluminal side of cerebral blood vessels and aid early sprout guidance and maturation by the expression of transporters, anti-permeability proteins and the secretion of growth factors. As key constituent of the glial limitans, astrocytic endfeet line the basement membrane surrounding the cerebral vasculature and provide a physical barrier between CNS and the peripheral blood system, thus limiting the influx of pathogens and large hydrophilic molecules ( Figure 1C ). Furthermore, astrocytes control water homeostasis in the CNS via Aquaporin-4 (Aqp4) and other channel proteins involved in bidirectional fluid exchange across the BBB ( Figure 1B ). The importance of Aqp4 in the CNS is demonstrated in a series of publications that link the (mal-)function of Aqp4 to multiple neurological disorders. Aqp4 has also been identified as a major target of autoantibodies in patients suffering from neuromyelitis optica (NMO), a rare CNS inflammatory disorder that has historically been closely associated to MS.

In addition to their versatile functions in the steady-state, astrocytes sense and react to danger signals in a multistep process referred to as astrogliosis. Combinatorial exposure to a broad spectrum of extracellular cues, including cytokines, growth factors, and hormones induces transcriptional remodeling, resulting in cellular hypertrophy, proliferation and secretion of inflammatory mediators ( Figure 1D ). The severity and permanence of these transcriptional changes is dependent on the type and strength of the stimuli and can range from reversible alterations to severe astrogliosis with compact scar formation. Most forms of astrogliosis share the upregulation of glial fibrillary acidic protein (GFAP), a phenomenon that has been observed in multiple CNS disorders.

For many decades, it was believed that severe astrogliosis and the formation of a glial scar inhibits axonal re-growth and is detrimental for neurological outcome. However, an increasing amount of evidence suggests that astrocytes also play beneficial roles in disease. Methodological advances in the genomic analysis of reactive astrocytes have begun to shed light on the molecular mechanisms that define the fine line between pathogenic and protective astrocyte functions. For instance, a landmark study by Zamanian and colleagues demonstrated that astrocytes respond differentially to varying forms of CNS insult. While exposure to lipopolysaccharide (LPS) resulted in the upregulation of pro-inflammatory genes and skewed astrocytes toward a cytotoxic profile, ischemia induced transcriptional programs that are associated with neuroprotective functions. In this context, particularly intercellular crosstalk with microglia has been identified as key regulator of astrocyte functions. Work by several groups including ours has unraveled molecular mechanisms through which microglia-derived molecules such as interleukin (IL)-1β, IL-10, tumor necrosis factor (TNF)-α, vascular endothelial growth factor (VEGF)-B, or transforming growth factor (TGF)- α, among others, modulate transcriptional programs in astrocytes that are associated to degenerative or protective functions ( Figure 1E ). In addition to microglia, numerous other CNS-resident and non-CNS-resident cell types modulate astroglial properties and are themselves subject to factors secreted by reactive astrocytes under inflammatory conditions. For instance, reactive astrocytes use contact- and diffusion-mediated mechanisms to modulate trafficking of peripheral immune cells into the CNS, a topic that has been extensively reviewed by Sofroniew and others ( Figure 1F ). Once the peripheral cells have extravasated, they accumulate in perivascular spaces where they are in close contact to astrocytic endfeet. It is possible that during this stage, MHCII+ astrocytes function as antigen-presenting cells to reactivate infiltrating lymphocytes and promote inflammation. Furthermore, there is increasing evidence that astrocytes control the survival of T-cells and B-cells via co-regulatory and secreted factors. Indeed, while FasL expression by astrocytes induces cell death in infiltrating lymphocytes, B cell–activating factor of the tumor necrosis factor (TNF) family (BAFF) produced by astrocytes promotes B-cell survival in inflammatory conditions and primary B cell lymphoma. Interestingly, astrocytes themselves respond to myeloid-derived APRIL, another member of the TNF superfamily with an increase in IL-10 production, consequently suppressing pro-inflammatory T-cell functions. These interactions between reactive astrocytes and cells of the adaptive immune system are complemented by their functions as part of the cerebral innate immune system.

Another degree of complexity is added when analyzing the temporal dynamics of astrogliosis in the context of disease. In vivo ablation experiments of astrocytes in experimental autoimmune encephalomyelitis (EAE), an animal model of Multiple Sclerosis (MS), demonstrated that astrocytes are required for disease suppression in early EAE stages, as loss of astrocytes worsened disease, characterized by increased BBB permeability, leukocyte infiltration, and neuronal death. Conversely, selective ablation of reactive astrocytes during the chronic phase of EAE ameliorated disease, marked by decreased microglial activation and monocyte infiltration. This and other studies underline the dire need to further dissect the contribution of astrocytes to the pathogenesis and progression of numerous CNS disorders.

While many studies focus on the pathogenic potential of reactive astrocytes, molecular mechanisms underlying their protective effects remain elusive at large. Here, we will discuss astrocyte-derived mediators with anti-inflammatory or tissue-protective properties, and examine how these factors may guide future therapeutic strategies. In this context we will not focus on protective astrocyte functions mediated by inflammatory cytokines or cell-cell contact, which have been reviewed extensively elsewhere, but rather concentrate on soluble factors often overlooked in the field of neuroinflammation.

Protective Effects of Reactive Astrocytes Following CNS Insult

A widely recognized protective function of astrogliosis is the formation of a physical barrier, which limits the influx of peripheral immune cells and thus restricts lesion size. This function has been discussed in depth in a series of excellent reviews. Here, we will focus on astrocyte secreted mediators relevant for astrocyte protective functions. Advances in single cell sequencing, spatial transcriptomics, and conditional knock-down approaches demonstrate that reactive astrocytes secrete a plethora of anti-inflammatory and tissue-protective mediators that act on numerous cells to control their inflammatory state ( Table 1 ). This review will focus on three major domains to summarize the existing knowledge on astrocyte protective function: neurotrophic factors, neuropoetic cytokines, and growth factors.

Neurotrophic Factors

Neurotrophic factors (NTFs) play an essential role in the growth, differentiation, and survival of neurons in health and disease. They can broadly be divided into neurotrophins, members of the ciliary neurotrophic factor (CNTF) family, and members of the glia derived neurotrophic factor (GDNF) family. While their role in the survival of neurons is relatively well defined, little is known about inflammatory functions and how astrocytes contribute to their production. Generally, glial cells are known to express low levels of NTFs under homeostatic conditions, but significantly upregulate their production following CNS damage.

BDNF

Brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) are members of the neurotrophin family and highly expressed by astrocytes during development. Throughout adulthood, astrocytes express low levels of BDNF but significantly upregulate its production in response to spinal cord injury (SCI), ischemia, and neuroinflammation. BDNF signals through two receptors, the high-affinity TrkB receptor and the low-affinity p75NTR receptor, both of which are expressed throughout the CNS by neurons, astrocytes, and oligodendrocytes. While BDNF/TrkB signaling on neurons has been shown to promote survival and neurite outgrowth, p75NTR signaling induces apoptosis in cultured neurons. This dualistic signaling system corresponds to the dichotomic effector functions of BDNF. Early studies in the context of axotomy and SCI demonstrated beneficial effects of BDNF on the regeneration and long-term survival of neurons ( Figure 2 ). In EAE, reports suggest that BDNF depletion in CNS resident cells during the initial phase worsens disease, while deletion during later stages does not lead to significant differences. Although this protective effect might depend on multiple cell types, astrocytes have been suggested to be a key participant in BDNF-dependent remyelination in the cuprizone model of de- and remyelination. This is supported by observations of increased progenitor cell proliferation and maturation of neurons following lentiviral overexpression of Bdnf in hippocampal astrocytes ( Figure 2 ). Furthermore, a study by Linker and colleagues demonstrated that conditional depletion of BDNF in astrocytes worsens EAE severity. Interestingly, the authors did not observe changes in infiltrating immune cells, but demonstrated a significant increase in axonal loss and demyelination.

Overall, these findings suggest that BDNF regulates axonal myelination and neuronal function through Trk/p75NTR signaling on neurons and potentially oligodendrocytes, making it a key constituent of neuronal health. This also becomes clear in the context of multiple neurodegenerative disorders, where a single nucleotide polymorphism (SNP) in the BDNF gene is associated to increased susceptibility, incidence and severity of MS and Alzheimer’s disease (AD), correlating with cognitive dysfunction. Although the relative contribution of BDNF producing cells to the protective effects of BDNF remains under debate, a substantial body of evidence points to astrocytes as key drivers of BDNF mediated effects in disease. Furthermore, astrocyte-derived BDNF has been identified as mediator of the therapeutic functions of glatiramer acetate (GA), a FDA-approved drug for the treatment of relapse-remitting MS (RRMS) in a mouse model of neurodegeneration, demonstrating the potential of astrocyte-derived BDNF for future therapeutic strategies. Nonetheless, recent evidence suggest that there is a fine line between protective and pathogenic astrocyte-mediated functions of BDNF, as astrocytes themselves respond to increased levels of BDNF with the secretion of neurotoxic amounts of nitric oxide (NO), demonstrating a sophisticated feedback loop that prevents excessive BDNF signaling.

NGF

In contrast to BDNF, little is known about the immunomodulatory and tissue-protective functions of astrocyte-derived NGF. Early studies suggest upregulation of Ngf mRNA in astrocytes in models of traumatic injury, Parkinson’s disease (PD), and neuroinflammation. Similar to BDNF, mature NGF is cleaved from its precursor pro-NGF and signals via a dual receptor system consisting of TrkA and p75NTR. While mature NGF preferentially binds to TrkA and promotes neuronal survival, pro-NGF has a higher affinity to p75NTR and has been shown to induce apoptotic signaling in oligodendrocytes and neurons. Under homeostatic conditions, pro-NGF and its mature form signal synergistically through TrkA/p75NTR to promote the survival and differentiation of neuronal cells; however, imbalances in the relative abundances of TrkA and p75NTR have been described in multiple CNS disorders. Interestingly, several reports demonstrate that activated astrocytes secrete increased amounts of neurotoxic pro-NGF in vitro and following SCI, suggesting a tissue-destructive role of endogenous, astrocyte-derived pro-NGF. In contrast, treatment with exogenous NGF has been shown to be beneficial in models of traumatic injury and neuroinflammation. For instance, administration of human NGF into the ventricle of marmoset monkeys prevented the development of lesions in an EAE model by skewing infiltrating T-cells towards an anti-inflammatory TH2 phenotype ( Figure 2 ). In line with this observation, a recent study reports that NGF instructs TrkA-mediated phagocytosis of neurotoxic Amyloid-β plaques by microglia in a mouse model of AD ( Figure 2 ). While it remains to be seen, which impact astrocyte-derived NGF has on the net effect of NGF, the activation of astrocytes and subsequent induction of Ngf expression by inflammation or stress-related events may contribute to both beneficial and harmful effects of NGF, depending on the availability of pro-NGF vs. mature NGF and the presence of TrkA vs. p75NTR receptors on adjacent cells. Of note, in addition to effects mediated by astrocyte derived NGF, a suppressive function of exogenously administered NGF in reactive astrocytes has been proposed, implicating a potential autocrine feedback loop that limits excessive astroglial activation.

GDNF

The GDNF family of neurotrophic factors consists of GDNF, neurturin (NTRN), artemin (ARTN), and persepin (PSPN). All four members belong to the TGF-β superfamily and signal through the RET Tyrosine kinase to regulate the differentiation and survival of multiple distinct sets of neurons. Interestingly, alternative signaling receptors, such as the neural cell adhesion molecule (NCAM) have been proposed and numerous studies suggest synergistic signaling with NGF, BDNF, and TGF-β. Reactive astrocytes rapidly upregulate the production of GDNF in response to LPS, IL-1β, IFN-γ and microglia-derived TNF-α, and have been shown to promote the survival of dopaminergic neurons in vitro. This is in line with in vivo studies that demonstrate beneficial effects of astrocyte-specific overexpression of Gdnf in models of Parkinson’s disease (PD). Furthermore, transplantation of human NPCs committed to a glial fate that have been genetically engineered to overexpress GDNF promoted neuronal survival and regeneration in primate models of amyotrophic lateral sclerosis (ALS) ( Figure 2 ). Besides the supportive effects of astrocyte-derived GDNF on neurons, GDNF/GDNFRα signaling has been shown to promote the trans-endothelial resistance in an in vitro BBB model, suggesting a positive effect of astrocyte-derived GDNF on tight-junction function and BBB permeability during neuroinflammation ( Figure 2 ). Collectively, further investigation into the anti-inflammatory and tissue-protective effects of astrocyte-derived GDNF is needed, but given the synergistic signaling of GDNF in combination with TGF-β and other NTFs, astrocytic GDNF may contribute to the reduction of inflammation and regenerative capacities following CNS insult.

CNTF

CNTF composes a separate family of neurotrophic factors and has been extensively studied as inducer of neuronal differentiation, survival and neurite outgrowth. Besides its effect on neurons, CNTF has been shown to support the maturation of oligodendrocytes and astrocytes ( Figure 2 ). It signals through a heterotrimeric receptor complex consisting of the non-signaling subunit ciliary neurotrophic factor receptor alpha (CNTFRα), and the two signaling chains glycoprotein-130 (gp130) and leukemia inhibitor factor receptor (LIFRβ), which are shared with the distantly related leukemia inhibitory factor (LIF) and interleukin-6 (IL-6). Upon CNTF binding, heterodimerization of gp130 and LIFRβ induces JAK/STAT dependent transcriptional programs that are associated with the differentiation and survival of neurons. Under homeostatic conditions, the expression of low levels of Cntf in astrocytes is limited to the white matter, indicating region-specific effects on distinct neuronal subpopulations. Interestingly, this finding is concordant with observations of increased Cntf expression in astrocytes and the upregulation of CNTFRα on neurons located in white matter lesions of MS patients. A study investigating the spatial and temporal dynamics of multiple NTFs in a cuprizone model of demyelination suggests that astrocytes express CNTF in a biphasic manner during initial demyelination and remyelination. Mechanistically, it has been proposed that loss of physical interaction between astrocytes and neurons following injury induces STAT3-mediated Cntf expression in astrocytes, which promotes survival of neurons and oligodendrocytes and may counteract TNF-α induced myelin disintegration during EAE ( Figure 2 ). Similar to GDNF, beneficial effects on BBB permeability and a reduction of immune cell infiltrates have been observed following administration of exogenous CNTF in a mouse model of neuroinflammation ( Figure 2 ). Collectively, the current data indicates that astrocyte derived CNTF might contribute to the reduction of acute inflammation and increases the survival of neurons and oligodendrocytes in the context of CNS insult. In addition, CNTF may promote the activation of surrounding astrocytes in an autocrine/paracrine manner.

MANF/CNDF

Mesencephalic Astrocyte-Derived Neurotrophic Factor (MANF) and Cerebral Dopamine Neurotrophic Factor (CDNF) constitute a novel, evolutionary conserved family of NTFs with regenerative capacities in health and disease. Although MANF and CDNF have been originally identified to provide neurotrophic support for dopaminergic neurons, it has become clear that their functions extend beyond those of classical NTFs. Both NTFs have been associated to numerous tissue-protective and anti-inflammatory functions in models of PD, ischemia and nerve injury. In addition, a series of recent studies demonstrated that MANF and CDNF are partially retained within the endoplasmic reticulum (ER), where they sense and respond to ER stress by negatively regulating NF-κB dependent inflammatory programs. In astrocytes, upregulation of both MANF and CDNF has been observed in response to ER stress and experimental stroke, where they alleviate the secretion of pro-inflammatory cytokines IL-1β, TNF-α, and IL-6. This is supported by a study using astrocyte-specific overexpression of Manf, which resulted in a downregulation of pro-inflammatory cytokines. Taken together, this indicates that astrocytic MANF and CDNF function as cell-autonomous safety switch that prevents ER stress induced overactivation and provides neurotrophic support for neurons ( Figure 2 ). Evidence from a Drosophila model of retinal tissue damage further suggests that MANF counteracts the pro-inflammatory functions of VEGF–related factor 1 (Pvf-1) homologue and is required for successful tissue repair. This is of particular interest in the context of glial communication, as VEGF secreted by microglia has been demonstrated to induce pro-inflammatory signaling in astrocytes, and the successive MANF secretion by astrocytes may present an anti-inflammatory mechanism that counteracts pathogenic VEGF signaling.

PDGF Family Members

Platelet-derived growth factors (PDGFs) and their cognate receptors compose a signaling network that consists of five ligand-dimers (PDGF-AA, PDGF-BB, PDGF-AB, PDGF-CC, PDGF-DD) and three receptors (PDGFR-αα, PDGFR-ββ, PDGFR-αβ). While PDGFs have originally been identified as growth factor for smooth muscle cells, they are nowadays viewed as potent inducer of oligodendrocyte proliferation and differentiation. Interestingly, the PDGF family of cysteine-knot growth factors also includes members of the VEGF subfamily, of which VEGF-B has been shown to induce pro-inflammatory gene expression in astrocytes. Similarly, astrocytes can also respond to PDGF-A and PDGF-C by expression of PDGFR-α, which serves as mitogen and inducer of astrocytic branching. In addition, a series of studies demonstrated that astrocytes express PDGF-A and PDGF-B monomers, but not PDGF-C or PDGF-D. In the developing brain, these astrocyte-derived PDGF variants modulate the proliferation and differentiation of oligodendrocyte precursor cells (OPCs) and potentially regulate the proliferation and survival of neurons. In the adult CNS, it remains unclear to what extent astrocytes contribute to the PDGF signaling network, as neurons have also been proposed as source of PDGF-A and PDGF-B. Nevertheless, early work by Silberstein et al. indicates that cultured astrocytes upregulate the expression of PDGFs in response to TNF-α and TGF-β, suggesting a role of PDGF signaling in inflammatory conditions. In this context, two independent studies investigated the therapeutic effects of astrocyte-derived PDGF-A by conditional overexpression in mouse models of chronic and acute CNS demyelination and revealed that elevated expression of PDGF-A by astrocytes significantly increased OPC survival and population density ( Figure 2 ). While these findings may prove useful to address the progressing demyelination in primary and secondary progressive MS and other degenerative CNS pathologies, important questions remain outstanding. Which programs control the expression of PDGFs in astrocytes? To what extent do astrocyte-derived PDGFs modulate the functions of oligodendrocytes and neurons? And what is their role in the remyelinating brain? Further research into the basic mechanisms of CNS intrinsic signaling of PDGFs is needed to warrant success in their use as future therapeutic target.

FGF Family Members

Fibroblast growth factors (FGFs) constitute a family of at least 20 secreted ligands with pleiotropic roles in the developing and mature CNS. Most FGF receptors (FGFRs) can respond to multiple FGF ligands (e.g. FGFR2 binds FGF1 to FGF10, whereas FGFR3 binds FGF1/2/4/8/9/17/18), creating a complex signaling network where a single FGF can induce distinct cellular responses. This notion is highlighted in a recent article by Duong et al., in which the authors report FGF8 to function as cell fate switch that controls the differentiation of radial glial cells in the SVZ into neurons or astrocytes. Additional studies have demonstrated that FGFs regulate astrocyte morphogenesis, maturation, and function in both health and disease. For instance, in remyelinating lesions of MS, FGF-1 may act as a promoter of remyelination by an indirect mechanism that involves the induction of CXCL8 and LIF expression in astrocytes.

Furthermore, astrocytes have been recognized as important source of FGFs. Indeed, reactive astrocytes have been found to upregulate FGF2 expression following CNS insult in multiple species in vivo and in vitro. In particular, a study by Messersmith et al. found significantly increased FGF2 mRNA transcripts and protein levels associated to white matter astrocytes in the initial phase of remyelination, indicating that astrocyte-derived FGF2 may modulate the differentiation of oligodendrocytes ( Figure 2 ). Other potential effects of astrocyte-derived FGF2 include the attenuation of neuronal death via signaling through FGFR3 and autocrine/paracrine regulation of glia reactivity. The therapeutic potential of FGF2 is recapitulated in a comprehensive study by Ruffini et al., in which the authors demonstrate that viral delivery of FGF2 to the CNS of mice 1 week after EAE induction significantly ameliorated the clinicopathological outcome, marked by reduced infiltration of peripheral immune cells, and an increase of myelin-forming oligodendrocytes. It is unclear, however, to what extent astrocytes contribute to these beneficial effects of FGF2. Indeed, several reports suggest that FGF2 in general, and astrocyte-derived FGF2 in particular can also inhibit oligodendrocyte repopulation and their remyelinating capacities in multiple models of CNS insult. Besides FGF2, astrocyte-derived FGF9 has been implicated to play a role during remyelination and CNS inflammation. Lindner et al. demonstrated in a series of in vitro experiments and post-mortem tissue analyses of MS patients that FGF9, upregulated by astrocytes following CNS insult, inhibits remyelination and induces the expression of inflammatory genes in oligodendrocytes. Overall, the existing data fails to produce a coherent picture on under which conditions FGF family members exhibit beneficial or harmful functions during CNS insult and extensive research is needed to illuminate the effects of astrocyte-derived FGFs. Nevertheless, accumulating evidence strongly suggests that FGFs play an important role in the pathophysiology of MS and and new insights may guide the development of FGF-based therapeutic strategies.

HB-EGF

HB-EGF has originally been identified in macrophage-like cells with mitogenic functions for numerous cell types. Similar to NGF and other neurotrophins, HB-EGF is synthesized in a pre-mature transmembrane form (pro-HB-EGF) before it is cleaved by numerous metalloproteinases (MMP3, MMP9, ADM9, ADAM10, ADAM12, ADAM17) into its mature, soluble form. While the membrane anchored pro-HB-EGF functions as juxtacrine growth factor and receptor for diphtheria toxin in some species, soluble HB-EGF has recently been described to modulate cell migration, differentiation, and inflammatory functions in multiple cell types. In addition, HB-EGF enhances neurogenesis in models of ischemic injury and promotes the survival of dopaminergic neurons ( Figure 2 ). Mature HB-EGF signals through EGFR, ErbB4 and a newly defined N-arginine dibasic convertase, but may also be able to induce ErbB2 through heterodimerization. In astrocytes, upregulation of HBEGF mRNA has been observed in response to sphingosine-1-phosphat (S1P)-receptor activation by S1P or S1P receptor modulator fingolimod. This may be dependent on combined S1P1R and S1P2R signaling and the activation of the immediate early transcription factors ERG1 and AP1, indicating that astrocyte-derived HB-EGF is part of a rapid response mechanism that counteracts pro-inflammatory astrocyte functions. Indeed, it has been suggested that HB-EGF suppresses the nuclear translocation of NF-κB by inhibition of IκB kinase (IKK) mediated inhibitor of κB (IκB) degradation. Collectively, astrocyte-derived HB-EGF may not only serve as neurotrophic factor but also dampen pro-inflammatory gene transcription in Egfr-expressing microglia and infiltrating immune cells.

IGF

Insulin-like growth factor 1 (IGF-1) is a polypeptide hormone and functions as primary mediator of growth hormone (GH) dependent growth effects in most peripheral tissues. In the brain, IGF-1 regulates the proliferation and differentiation of multiple CNS resident cells and has been implicated in several neurological disorders. IGF-1 signals through its cognate receptor IGFR-1R, but can also form functional hybrids with the insulin receptor. Besides IGF-1, IGF-2 and its receptor IGF-2R share a similar expression pattern in the developing and mature CNS. Both IGF/IGFR pairs signal through phosphoinositide 3-kinase (PI3K)–AKT–forkhead box protein O (FOXO) and RAS–mitogen-activated protein kinase (MAPK) pathways to induce downstream expression of growth promoting genes. Interestingly, IGF-1R can furthermore modulate transcription directly by acting as transcriptional regulator in the nucleus. Numerous studies indicate roles for IGF-1/IGF-1R signaling in the pathogenesis and progression of neurological disorders and show that their expression is differentially modulated by CNS insult. While microglia have been implicated as main source of IGFs under pathological conditions, the neuroprotective potential of astrocyte-derived IGFs has recently gained attention. For example, conditional overexpression of IGF-1 in astrocytes promoted neuronal survival and reduced hippocampal neurodegeneration in a controlled cortical injury (CCI) model, highlighting the therapeutic efficacy of astrocyte-derived IGFs ( Figure 2 ). Although the role of endogenous, astrocyte-derived IGFs in the context of neuroinflammation must be further investigated, its broad spectrum of growth promoting effects on CNS-resident cells may provide beneficial for neuronal and non-neuronal regeneration.

TGF-β

Transforming growth factor β (TGF-β) belongs to a family of pleiotrophic cytokines with potent regulatory and inflammatory functions in numerous cell types. In mammals, TGF-β exists in three isoforms (TGF-β1. TGF-β2, TGF-β3), with TGF-β1 being the most prevalent one. The immunoregulatory cytokine elicits its function through binding to TGF-β type I (TGF-βRI) and type II (TGF-βRII) receptors, which induce Smad protein phosphorylation and downstream transcriptional regulation of their target genes. Generally, TGF-β has been identified as master regulator of immune tolerance, T cell differentiation and mediator of inflammatory responses in multiple cell types. In addition, work by Krieglstein and others suggests that TGF-β also exerts neurotrophic functions through direct or indirect regulation of neuronal development and survival ( Figure 2 ). While members of the TGF-β superfamily are widely expressed among numerous cell types in the CNS, astrocytes have been implicated as key contributor of endogenous TGF-β in the CNS. Indeed, astrocyte-derived TGF-β has been linked to anti-inflammatory and neuroprotective functions in models of experimental stroke, Toxoplasma infection, and AD. Although the molecular mechanisms underlying the anti-inflammatory and neuroprotective functions of astrocyte-derived TGF-β in the context of neuroinflammation remain to be defined, TGF-β may exert its beneficial role through the suppression of glial NF-κB signaling and the associated pro-inflammatory functions of CNS resident macrophages and microglia ( Figure 2 ). This is in line with a study defining an IL-10/TGF-β signaling loop between activated astrocytes and microglia that limits CNS inflammation. Microglia-derived IL-10, an anti-inflammatory cytokine, redirected astrocyte pathogenic functions and stimulated the production of TGF-β, which in turn reduced microglial activation and the secretion of pro-inflammatory IL-1β. Taken together, astrocyte-derived TGF-β may serve as immunosuppressive cytokine during initial inflammation while its neurotrophic functions support axonal regeneration during recovery.

LIF

Leukemia inhibitory factor (LIF) is another member of the IL-6 class cytokine family. Analogous to CNTF, LIF signals through LIFRα and gp130 to induce JAK/STAT dependent gene transcription. It was first described as a suppressor of proliferation in a myeloid leukemia cell line, but has since been associated to functions in multiple peripheral organs. In addition, LIF has been recognized as neuropoetic cytokine, regulating the differentiation and activation of multiple cell types in the CNS. Under homeostatic conditions, expression of Lif remains low in the CNS, but is heavily ramped up in response to various types of insult. Astrocytes are thought to play an important role in the upregulation of LIF, and have been identified as major source of Lif mRNA in the injured brain. Consequently, astrocyte-derived LIF may potentiate stem cell renewal in the adult SVZ and increase the regenerative capacities following CNS insult ( Figure 2 ). Although it is not entirely clear what mechanisms modulate the upregulation of Lif expression in astrocytes, S1PR signaling has been shown to be a potent inducer. Apart from its beneficial functions on stem cell regeneration and neurogenesis, accumulating evidence shows that LIF plays essential roles during oligodendrocyte maturation and function in the context of autoimmune inflammation and remyelination. This becomes important both in health and disease. A study by Ishibashi demonstrated that astrocytes secrete LIF in response to ATP stimulation and promote the oligodendrocyte-mediated myelination of axons, defining a mechanism that mediates myelination in an activity-dependent manner. During EAE, increased levels of LIF have been associated to protective functions and increased survival of oligodendrocytes ( Figure 2 ). In line with this notion, blockage of LIF worsened oligodendrocyte loss while conditional deletion of a LIFR/gp130 suppressor protected against cuprizone-induced demyelination. Aside from oligodendrocytes, LIF has been implicated in the regulation of T-cell responses by altering their pathogenic potential. Indeed, several studies show that LIF suppresses pro-inflammatory gene expression in CD4 T-cells and skews their polarization in an anti-inflammatory manner ( Figure 2 ). Collectively, these data suggest that astrocyte-derived LIF may contribute to the resolution of acute tissue inflammation, promote the remyelinating capacities of oligodendrocytes, and induce stem-cell renewal to prevent long-term neurodegeneration.

Non-Secreted Factors

In addition to neurotrophic factors, neuropoetic cytokines and growth factors, astrocytes secrete a plethora of other protective factors, including cytokines, metabolites, extracellular matrix (ECM) proteins, and metalloproteinases (MMPs). In the healthy brain, tight metabolic coupling between neurons and astrocytes is key to sustain high firing rates and neuronal wellbeing. Recently, it has been suggested that the metabolic crosstalk between astrocytes and neurons also plays important roles during neuroinflammation and neurodegeneration. In this context, it remains to be defined which metabolites with protective functions during homeostasis have similar effects in the inflamed or injured brain. Similarly, astrocyte-derived ECM proteins and MMPs have been associated to numerous protective functions in the healthy brain. However, it has been well documented that astrocyte-derived chondroitin sulfate proteoglycans (GSPGs), which are a key component of the ECM, restrict remyelination, neurite outgrowth and limit functional recovery following CNS injury. Among multiple other strategies to overcome CSPG mediated inhibition of neuronal regeneration, MMPs have been proposed to exhibit protective effects in the post-acute phase of CNS injury. Indeed, astrocyte-derived MMPs may promote neuronal plasticity in the healthy brain and enhance functional recovery through ECM dependent and independent mechanisms. Future research will need to determine which parameters dictate the protective effects of astrocyte-derived ECM components and MMPs, and how they can be harnessed for therapeutic strategies to enhance recovery following CNS insult.

Therapeutic Outlook and Discussion

Currently, only few effective therapies exist to tackle the vast complexity of neurological disorders and the development of novel strategies is hampered by their limited access to the CNS. Exogenously administered agents require a high permeability through the BBB and a persisting bioavailability to ensure long-lasting therapeutic effects. Only a limited number of small molecules has shown beneficial “protective” effects on glial cells following acute CNS insult so far, which is best documented during neuroinflammation. Thus, there is a dire need for novel strategies that mediate recovery after acute CNS insult and lead to long-term regeneration in chronic inflammatory and degenerative diseases. Based on their strategic location and versatile roles in the pathogenesis and progression of CNS disorders, astrocytes have been proposed as therapeutic targets. Generally, most existing approaches targeting astrocytes in the context of neurological disorders are based on gene therapy, cell replacement, or the exogenous administration of compounds that induce neuroprotective functions in astrocytes. As discussed above, multiple exogenously administered molecules mimic the protective functions of astrocyte-derived mediators or induce their endogenous production. Although these strategies represent promising approaches, several issues will need to be addressed.

First, the multi-faceted functions of astrocyte derived mediators are determined by their differential spatial and temporal expression. Consequently, exogenous activation of astrocytes at an improper time-point and in the wrong microenvironment might result in harmful, rather than beneficial effects, ultimately worsening clinical outcome. Further research is needed to determine (1) how many functionally distinct astrocyte-subsets exist, (2) which factors induce their differentiation, (3) how the underlying transcriptional programs relate to the differential secretion of astrocyte-derived mediators, and (4) whether these transcriptional subsets also correlate with different secretional and functional astrocyte subpopulations.

Most protective effects mediated by astrocytes are the result of a transient response to environmental cues present in the disease-specific micro-environment. It is conceivable that the diversity and strength of the intercellular crosstalk, specific to a given lesion type, also strongly influences the outcome of specific therapeutic strategies. Indeed, while a transient and highly disease-specific astrocyte response allows for an adapted reaction to the respective insult and prevents extensive overactivation/-suppression, exogenous induction of specific tissue-protective pathways may only provide short-term solutions to long-term problems, and eventually wear off when the local microenvironment changes over the course of the disease.

In these lines, genetic modifications of astrocytes to foster their tissue-protective and anti-inflammatory functions have been proposed. These approaches might be particularly useful for the treatment of chronic conditions and allow for the targeted activation of protective subpopulations. In this context, adeno-associated viruses (AAVs) have been proven to be efficient vectors for viral gene delivery. Interestingly, a landmark study by Foust and colleagues demonstrated that AAV serotype 9 successfully bypasses the BBB and predominantly transduces astrocytes in the adult mouse brain. Further modifications such as the conditional expression of target genes under the astrocyte-specific GFAP promoter may enhance viral delivery and present a robust delivery system. However, AAVs are limited to a relatively small insert size (4.7 kb) and viral delivery may have unpredictable off-target effects. To overcome this complication, cell replacement strategies (using genetically modified or unmodified cells) may present a useful alternative to harness the anti-inflammatory and tissue-protective functions of astrocytes. Several transplantation trials of human fetal mesencephalic stem cells into striatal regions of PD patients have demonstrated successful functional integration and long-term benefits. This is different for astrocytes, as they require differentiation into their mature form before being grafted. Although we have little information about whether human astrocytes can be generated from embryonic stem cells (ESCs) or NSCs, several studies report successful and stable differentiation of human ESCs into dopaminergic neurons, and transplantation of glial-restricted pluripotent stem cells in mouse models of ALS suggest that this might represent a feasible approach. One significant advantage over existing cell replacement therapies using neurons is that one astrocyte has the capacity to induce differentiation and survival in numerous neurons (through the secretion of soluble factors), thus making it an efficient approach to tackle neurodegeneration. Indeed, two ongoing Phase I/IIa trials (NCT03482050, with GDNF overexpression NCT02943850) currently examine the therapeutic potential of grafted human stem cell derived astrocytes for the treatment of ALS.

Overall, numerous studies presented in this review suggest that exogenous application or the genetic overexpression of astrocyte derived factors limit inflammation and aid central nervous regeneration. These findings need to be strengthened and extensively recapitulated in other clinically relevant model species and CNS injuries before taking the next step towards clinical application. Such models will allow to find common mechanisms underlying tissue-protective functions of astrocytes and assess their translatability in a defined setting. Furthermore, it will become essential to investigate the combinatorial effects of astrocyte-derived factors as multiple studies have demonstrated synergistic effects and cross-regulatory mechanisms between several of the discussed mediators. Lastly, we are just beginning to grasp the versatile roles glial cells play in the diseased CNS and the extensive characterization of astrocytic subsets beyond a dualistic concept will be inevitable to understand their roles in the context of CNS inflammation. Novel high-throughput technologies will pave the way for a better understanding of what signals drive the secretion of protective factors by astrocytes, to what extent these transcriptional profiles are influenced by intercellular communication, and how we can harness the protective potential of reactive astrocytes in a clinical setting.

Author Contributions

Both ML and VR researched data and reviewed and edited the manuscript. ML wrote the manuscript.

Funding

This work was supported by grants RO4866/2-1 and RO4866/4-1 from the German Research foundation (DFG) and an ERC Starting Grant (851693 – HICI) by the European Research Council.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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    Arrieta A Blackwood EA Stauffer WT Domingo MS Bilal AS Thuerauf DJ Mesencephalic astrocyte–derived neurotrophic factor is an ER-resident chaperone that protects against reductive stress in the heart. J Biol Chem (2020 ) 295(22):7566–83.

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    Yeh H-J Ruit KG Wang Y-X Parks WC Snider WD Deuel TF PDGF A-chain gene is expressed by mammalian neurons during development and in maturity. Cell (1991 ) 64(1):209–16.

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    Mohan H Friese A Albrecht S Krumbholz M Elliott CL Arthur A Transcript profiling of different types of multiple sclerosis lesions yields FGF1 as a promoter of remyelination. Acta Neuropathol Commun (2014 ) 2(1):168.

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    Ruffini F Furlan R Poliani PL Brambilla E Marconi PC Bergami A Fibroblast growth factor-II gene therapy reverts the clinical course and the pathological signs of chronic experimental autoimmune encephalomyelitis in C57BL/6 mice. Gene Ther (2001 ) 8(16):1207–13.

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    Tobin JE Xie M Le TQ Song S-K Armstrong RC Reduced Axonopathy and Enhanced Remyelination After Chronic Demyelination in Fibroblast Growth Factor 2 (Fgf2)-Null Mice: Differential Detection With Diffusion Tensor Imaging. J Neuropathol Exp Neurol (2011 ) 70(2):157–65.

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    Yang Z Mosser DM Zhang X Activation of the MAPK, ERK, following Leishmania amazonensis Infection of Macrophages. J Immunol (2007 ) 178(2):1077–85.

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    Shen Y Ruan L Lian C Li R Tu Z Liu H Discovery of HB-EGF binding peptides and their functional characterization in ovarian cancer cell lines. Cell Death Discovery (2019 ) 5(1):1–11.

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    Miyata K Yotsumoto F Nam SO Kuroki M Miyamoto S Regulatory Mechanisms of the HB-EGF Autocrine Loop in Inflammation, Homeostasis, Development and Cancer. Anticancer Res (2012 ) 32(6):2347–52.

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    Mehta VB Besner GE Heparin-Binding Epidermal Growth Factor-Like Growth Factor Inhibits Cytokine-Induced NF-κB Activation and Nitric Oxide Production via Activation of the Phosphatidylinositol 3-Kinase Pathway. J Immunol (2005 ) 175(3):1911–8.

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    Farahnak S Simon L McGovern TK Chen M Khazaei N Martin JG HB-EGF Synthesized by CD4 T Cells Modulates Allergic Airway Eosinophilia by Regulating IL-5 Synthesis. J Immunol (2019 ) 203:39–47.

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    Mehta VB Besner GE Inhibition of NF-κB Activation and Its Target Genes by Heparin-Binding Epidermal Growth Factor-Like Growth Factor. J Immunol (2003 ) 171(11):6014–22.

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    Jin K Mao XO Sun Y Xie L Jin L Nishi E Heparin-binding epidermal growth factor-like growth factor: hypoxia-inducible expression in vitro and stimulation of neurogenesis in vitro and in vivo. J Neurosci Off J Soc Neurosci (2002 ) 22(13):5365–73.

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    Farkas LM Krieglstein K Heparin-binding epidermal growth factor-like growth factor (HB-EGF) regulates survival of midbrain dopaminergic neurons. J Neural Transm Vienna Austria 1996 (2002 ) 109(3):267–77.

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    Wang L-M Kuo A Alimandi M Veri MC Lee C-C Kapoor V ErbB2 expression increases the spectrum and potency of ligand-mediated signal transduction through ErbB4. Proc Natl Acad Sci (1998 ) 95(12):6809–14.

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    Nishi E Prat A Hospital V Elenius K Klagsbrun M N-arginine dibasic convertase is a specific receptor for heparin-binding EGF-like growth factor that mediates cell migration. EMBO J (2001 ) 20(13):3342–50.

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    Iwamoto R Yamazaki S Asakura M Takashima S Hasuwa H Miyado K Heparin-binding EGF-like growth factor and ErbB signaling is essential for heart function. Proc Natl Acad Sci (2003 ) 100(6):3221–6.

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    Clayton PE Banerjee I Murray PG Renehan AG Growth hormone, the insulin-like growth factor axis, insulin and cancer risk. Nat Rev Endocrinol (2011 ) 7(1):11–24.

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    Fernandez AM Torres-Alemán I The many faces of insulin-like peptide signalling in the brain. Nat Rev Neurosci (2012 ) 13(4):225–39.

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    Song Y Pimentel C Walters K Boller L Ghiasvand S Liu J Neuroprotective levels of IGF-1 exacerbate epileptogenesis after brain injury. Sci Rep (2016 ) 6(1):32095.

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    Sehat B Tofigh A Lin Y Trocmé E Liljedahl U Lagergren J SUMOylation mediates the nuclear translocation and signaling of the IGF-1 receptor. Sci Signal (2010 ) 3(108):ra10.

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    Beilharz EJ Russo VC Butler G Baker NL Connor B Sirimanne ES Co-ordinated and cellular specific induction of the components of the IGF/IGFBP axis in the rat brain following hypoxic-ischemic injury. Brain Res Mol Brain Res (1998 ) 59(2):119–34.

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    Walter HJ Berry M Hill DJ Cwyfan-Hughes S Holly JM Logan A Distinct sites of insulin-like growth factor (IGF)-II expression and localization in lesioned rat brain: possible roles of IGF binding proteins (IGFBPs) in the mediation of IGF-II activity. Endocrinology (1999 ) 140(1):520–32.

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    Li MO Flavell RA TGF-beta: a master of all T cell trades. Cell (2008 ) 134(3):392–404.

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  236. 236.

    Li MO Wan YY Sanjabi S Robertson A-KL Flavell RA TRANSFORMING GROWTH FACTOR-β REGULATION OF IMMUNE RESPONSES. Annu Rev Immunol (2006 ) 24(1):99–146.

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  237. 237.

    Li MO Flavell RA Contextual Regulation of Inflammation: A Duet by Transforming Growth Factor-β and Interleukin-10. Immunity (2008 ) 28(4):468–76.

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  238. 238.

    Huse M Muir TW Xu L Chen Y-G Kuriyan J Massagué J The TGFβ Receptor Activation Process: An Inhibitor- to Substrate-Binding Switch. Mol Cell (2001 ) 8(3):671–82.

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    Shull MM Ormsby I Kier AB Pawlowski S Diebold RJ Yin M Targeted disruption of the mouse transforming growth factor-beta 1 gene results in multifocal inflammatory disease. Nature (1992 ) 359(6397):693–9.

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  240. 240.

    Gorelik L Flavell RA Transforming growth factor-β in T-cell biology. Nat Rev Immunol (2002 ) 2(1):46–53.

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    Meyers EA Kessler JA TGF-β Family Signaling in Neural and Neuronal Differentiation, Development, and Function. Cold Spring Harb Perspect Biol (2017 ) 9(8):a022244.

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    Dünker N Krieglstein K Reduced programmed cell death in the retina and defects in lens and cornea of Tgfβ2–/–Tgfβ3–/–double-deficient mice. Cell Tissue Res (2003 ) 313(1):1–10.

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    Krieglstein K Unsicker K Transforming growth factor-β promotes survival of midbrain dopaminergic neurons and protects them against N-methyl-4-phenylpyridinium ion toxicity. Neuroscience (1994 ) 63(4):1189–96.

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    Krieglstein K Henheik P Farkas L Jaszai J Galter D Krohn K Glial Cell Line-Derived Neurotrophic Factor Requires Transforming Growth Factor-β for Exerting Its Full Neurotrophic Potential on Peripheral and CNS Neurons. J Neurosci (1998 ) 18(23):9822–34.

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    Krieglstein K Richter S Farkas L Schuster N Dünker N Oppenheim RW Reduction of endogenous transforming growth factors β prevents ontogenetic neuron death. Nat Neurosci (2000 ) 3(11):1085–90.

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    Kim SY Senatorov VV Morrissey CS Lippmann K Vazquez O Milikovsky DZ TGFβ signaling is associated with changes in inflammatory gene expression and perineuronal net degradation around inhibitory neurons following various neurological insults. Sci Rep (2017 ) 7(1):1–14.

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  247. 247.

    Brionne TC Tesseur I Masliah E Wyss-Coray T Loss of TGF-β1 Leads to Increased Neuronal Cell Death and Microgliosis in Mouse Brain. Neuron (2003 ) 40(6):1133–45.

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    Zhu Y Yang G-Y Ahlemeyer B Pang L Che X-M Culmsee C Transforming Growth Factor-β1 Increases Bad Phosphorylation and Protects Neurons Against Damage. J Neurosci (2002 ) 22(10):3898–909.

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    Xue X Zhang W Zhu J Chen X Zhou S Xu Z Aquaporin-4 deficiency reduces TGF-β1 in mouse midbrains and exacerbates pathology in experimental Parkinson’s disease. J Cell Mol Med (2019 ) 23(4):2568–82.

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    Cekanaviciute E Fathali N Doyle KP Williams AM Han J Buckwalter MS Astrocytic transforming growth factor-beta signaling reduces subacute neuroinflammation after stroke in mice. Glia (2014 ) 62(8):1227–40.

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    Diniz LP Tortelli V Matias I Morgado J Araujo APB Melo HM Astrocyte Transforming Growth Factor Beta 1 Protects Synapses against Aβ Oligomers in Alzheimer’s Disease Model. J Neurosci (2017 ) 37(28):6797–809.

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    Ni H Ding N-Z Harper MJK Yang Z-M Expression of leukemia inhibitory factor receptor and gp130 in mouse uterus during early pregnancy. Mol Reprod Dev (2002 ) 63(2):143–50.

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    Gearing DP Gough NM King JA Hilton DJ Nicola NA Simpson RJ Molecular cloning and expression of cDNA encoding a murine myeloid leukaemia inhibitory factor (LIF). EMBO J (1987 ) 6(13):3995–4002.

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    Wang H Wang J Zhao Y Zhang X Liu J Zhang C LIF is essential for ISC function and protects against radiation-induced gastrointestinal syndrome. Cell Death Dis (2020 ) 11(7):1–15.

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    Yu H Yue X Zhao Y Li X Wu L Zhang C LIF negatively regulates tumour-suppressor p53 through Stat3/ID1/MDM2 in colorectal cancers. Nat Commun (2014 ) 5(1):1–12.

    Not in our library10.1038/ncomms6218 (opens in a new tab)

  256. 256.
    LIF regulates CXCL9 in tumor-associated macrophages and prevents CD8+ T cell tumor-infiltration impairing anti-PD1 therapy · 2019
    No notice
  257. 257.

    Nguyen HN Noss EH Mizoguchi F Huppertz C Wei KS Watts GFM Autocrine Loop Involving IL-6 Family Member LIF, LIF Receptor, and STAT4 Drives Sustained Fibroblast Production of Inflammatory Mediators. Immunity (2017 ) 46(2):220–32.

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    Scott RL Gurusinghe AD Rudvosky AA Kozlakivsky V Murray SS Satoh M Expression of leukemia inhibitory factor receptor mRNA in sensory dorsal root ganglion and spinal motor neurons of the neonatal rat. Neurosci Lett (2000 ) 295(1):49–53.

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    Bauer S Kerr BJ Patterson PH The neuropoietic cytokine family in development, plasticity, disease and injury. Nat Rev Neurosci (2007 ) 8(3):221–32.

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    Moon C Yoo J-Y Matarazzo V Sung YK Kim EJ Ronnett GV Leukemia inhibitory factor inhibits neuronal terminal differentiation through STAT3 activation. Proc Natl Acad Sci (2002 ) 99(13):9015–20.

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    Shimazaki T Shingo T Weiss S The ciliary neurotrophic factor/leukemia inhibitory factor/gp130 receptor complex operates in the maintenance of mammalian forebrain neural stem cells. J Neurosci Off J Soc Neurosci (2001 ) 21(19):7642–53.

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    Bauer S Patterson PH Leukemia inhibitory factor promotes neural stem cell self-renewal in the adult brain. J Neurosci Off J Soc Neurosci (2006 ) 26(46):12089–99.

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    Banner LR Moayeri NN Patterson PH Leukemia inhibitory factor is expressed in astrocytes following cortical brain injury. Exp Neurol (1997 ) 147(1):1–9.

    Not in our library10.1006/exnr.1997.6536 (opens in a new tab)

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    Suzuki S Tanaka K Nogawa S Ito D Dembo T Kosakai A Immunohistochemical detection of leukemia inhibitory factor after focal cerebral ischemia in rats. J Cereb Blood Flow Metab Off J Int Soc Cereb Blood Flow Metab (2000 ) 20(4):661–8.

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    Leibinger M Müller A Andreadaki A Hauk TG Kirsch M Fischer D Neuroprotective and Axon Growth-Promoting Effects following Inflammatory Stimulation on Mature Retinal Ganglion Cells in Mice Depend on Ciliary Neurotrophic Factor and Leukemia Inhibitory Factor. J Neurosci (2009 ) 29(45):14334–41.

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    Emery B Cate HS Marriott M Merson T Binder MD Snell C Suppressor of cytokine signaling 3 limits protection of leukemia inhibitory factor receptor signaling against central demyelination. Proc Natl Acad Sci U S A (2006 ) 103(20):7859–64.

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