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Transcriptional dysregulation of 5-HT1A autoreceptors in mental illness

Paul R Albert, Brice Le François, Anne M Millar

Molecular Brain · 2011 · Review

doi:10.1186/1756-6606-4-21

Abstract

The serotonin-1A (5-HT1A) receptor is among the most abundant and widely distributed 5-HT receptors in the brain, but is also expressed on serotonin neurons as an autoreceptor where it plays a critical role in regulating the activity of the entire serotonin system. Over-expression of the 5-HT1A autoreceptor has been implicated in reducing serotonergic neurotransmission, and is associated with major depression and suicide. Extensive characterization of the transcriptional regulation of the 5-HT1A gene (HTR1A) using cell culture systems has revealed a GC-rich "housekeeping" promoter that non-selectively drives its expression; this is flanked by a series of upstream repressor elements for REST, Freud-1/CC2D1A and Freud-2/CC2D1B factors that not only restrict its expression to neurons, but may also regulate the level of expression of 5-HT1A receptors in various subsets of neurons, including serotonergic neurons. A separate set of allele-specific factors, including Deaf1, Hes1 and Hes5 repress at the HTR1A C(-1019)G (rs6295) polymorphism in serotonergic neurons in culture, as well as in vivo. Pet1, an obligatory enhancer for serotonergic differentiation, has been identified as a potent activator of 5-HT1A autoreceptor expression. Taken together, these results highlight an integrated regulation of 5-HT1A autoreceptors that differs in several aspects from regulation of post-synaptic 5-HT1A receptors, and could be selectively targeted to enhance serotonergic neurotransmission.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 26, 2026. Paragraph numbers are ours, so an answer can point at one.

Serotonin in Major Depression

Major depression is a common and severe mental illness with a lifetime prevalence of 15% (1 in 6) compared with 1% for schizophrenia, and is twice as frequent in women as in men. In developed countries, MDD currently accounts for the second highest lifetime burden of disease, and is forecast to be highest by 2030. With current antidepressant treatments, although up to 60% of patients respond, only 30% go on to remission, and 15% attempt suicide. Although other neurotransmitters (e.g., noradrenaline, dopamine, glutamate, neurotrophins) are indirectly involved in depression, multiple lines of evidence implicate reduced 5-HT neurotransmission as a primary defect in depression. For example, acute tryptophan depletion triggers relapse in recovered depressed patients, and elicits a depressed mood in normal subjects, while most antidepressant treatments, including serotonin-selective reuptake inhibitor (SSRIs), increase 5-HT neurotransmission either directly or indirectly. Alterations in 5-HT1A receptor levels are commonly observed in depressed individuals. In particular, post-synaptic 5-HT1A receptors are reduced in several cortical regions in depression and anxiety, while 5-HT1A autoreceptors are increased in depression. Elevated 5-HT1A autoreceptor expression would tend to reduce the activity of 5-HT neurons, while reduced post-synaptic 5-HT1A receptors would result in a blunted behavioral response to 5-HT. These studies implicate the 5-HT1A receptor as an important determinant of predisposition to mental illness. However, the mechanisms underlying these differential changes in 5-HT1A receptor expression remain unclear. This review examines the evidence that alterations in transcriptional regulation of the 5-HT1A receptor could underlie its dys-regulation in mental illness.

5-HT1A autoreceptor function

The brain 5-HT system originates from neurons of the raphe nuclei that express tryptophan hydroxylase 2 (TPH2), the rate-limiting enzyme for 5-HT synthesis in the central nervous system (Figure 1). These neurons project widely throughout the brain to regulate many functions, including sleep, mood, and stress reactivity and are implicated in mental illnesses, including major depression and anxiety. Among the 14 5-HT receptor genes, the 5-HT1A receptor is of particular interest since it is abundant in corticolimbic regions that are implicated in mood and emotion, such as the hippocampal and cortical pyramidal neurons and interneurons of the prefrontal cortex, medial septum, amygdala, hypothalamus, and other regions. Presynaptically, the 5-HT1A receptor is the major somatodendritic autoreceptor on 5-HT neurons where it acts as a "brake" to inhibit the activity of the entire 5-HT system and is thought to delay antidepressant response (Figure 2). Hence mechanisms that regulate 5-HT1A autoreceptor levels are likely to set the tone of the entire 5-HT system and thus influence susceptibility to mood disorders such as depression, anxiety, and related disorders.

Signaling of the 5-HT1A autoreceptor

The 5-HT1A receptor was the first 5-HT receptor cloned and encodes a protein with seven hydrophobic transmembrane domains, typical of G-protein coupled receptors (Figure 3). The 5-HT1A receptor couples to Gi/Go proteins, and in most cells and inhibits adenylyl cyclase activation, reducing cAMP levels. Several studies have investigated the signaling of the 5-HT1A autoreceptor in raphe neurons. This is also the case in the raphe nucleus, where the 5-HT1A autoreceptor preferentially couples to Gαi3, and negatively regulates serotonergic neuronal activity, in part by inhibiting adenylyl cyclase. Interestingly, signaling to this pathway depends on the 5-HT1A agonist used. In addition, the 5-HT1A autoreceptor also activates GIRK potassium channels to inhibit neuronal firing, and inhibits voltage-gated calcium channel activity to reduce calcium entry (Figure 3). In post-synaptic cortical neurons, 5-HT1A-mediated inhibition of cAMP is thought to reduce CAMKII activity and to reduce AMPA receptor levels. In hippocampal neurons, 5-HT1A receptor activation leads to activation of Akt and inactivation of GSK3β, which is also seen in raphe cultures, but has no effect on basal ERK1/2 phosphorylation. Using rat raphe RN46A cells, a model of serotonergic neurons that express endogenous 5-HT1A autoreceptors, we found that 5-HT1A receptors signaled to inhibit of adenylyl cyclase and ERK1/2 phosphorylation, and that ERK1/2 inhibition was augmented upon differentiation of the cells to a serotonergic phenotype. Similarly, in cortical neurons and human neuronal cultures, the 5-HT1A receptor also inhibits ERK1/2 activation. Thus, modulation of ERK1/2 activity may be cell- and maturation-dependent and may also depend on the expression of negative regulators of this pathway (such as MKP or PP2A). Therefore, in the raphe, the signaling of the 5-HT1A autoreceptor appears to be largely inhibitory.

5-HT1A receptors and antidepressant response

Although antidepressants such as SSRIs, rapidly block 5-HT reuptake, chronic 3-wk treatment is required for clinical improvement and desensitization of the 5-HT1A autoreceptor has been implicated in this delay (Figure 3). Blier, de Montigny and colleagues demonstrated that multiple antidepressant treatments reduce auto-inhibition of serotonergic activity in the raphe nuclei by 5-HT1A autoreceptors, and in some cases sensitize responses of post-synaptic 5-HT1A receptors. This work has led to the concept that chronic desensitization of the 5-HT1A autoreceptor is necessary to achieve increased serotonergic neurotransmission following antidepressant treatment and to increase serotonin synthesis. Consistent with this, the level of 5-HT1A autoreceptors is negatively correlated with raphe 5-HT synthesis in human subjects. The prolonged time course of 5-HT1A desensitization is consistent with adaptive reduction in 5-HT1A receptor expression, as opposed to more rapid forms of desensitization such as receptor uncoupling or internalization. In studies of normal animals chronically treated with SSRIs, only acute desensitization of the autoreceptor is observed, with no changes in 5-HT1A autoreceptor RNA or protein levels in the raphe. In contrast, studies in chronically stressed or older animals have shown reductions in 5-HT1A RNA in raphe nuclei following chronic antidepressant treatment. During chronic SSRI treatment, 5-HT1A autoreceptors desensitize, leading to reduced 5-HT1A autoreceptor levels in animal depression models and depressed subjects, and restoration of raphe firing activity and 5-HT release. Thus both acute and chronic desensitization processes appear to be required for long-term inactivation of 5-HT1A autoreceptors in SSRI treatment of depressed animal models. However, the mechanisms involved in the preferential down-regulation of 5-HT1A autoreceptors, but not post-synaptic 5-HT1A receptors following chronic antidepressant treatment remain to be clarified.

Upon treatment with SSRIs, it is presumed that as well as inhibiting 5-HT reuptake at the nerve terminals in target brain regions, 5-HT levels are increased at the cell body and dendrites of raphe neurons leading to autoinhibition (Figure 2). However, the mechanism by which SSRI treatment enhances 5-HT release in the raphe is unclear. Although recurrent collaterals or intra-raphe cross-innervation occurs in culture, it has been difficult to demonstrate 5-HT terminals in the raphe nuclei. The finding that VMAT2 is targeted to dendrites for somatodendritic vesicular dopamine release provides a new mechanism by which 5-HT may be released somatodendritically. Recent evidence suggests that somatodendritic 5-HT release can occur, at least in culture. But can transcriptional down-regulation account for a 3-week delay in antidepressant response? In cultured cells, siRNA can reduce target RNA within days, however, the half-life of 5-HT1A receptor protein in vivo is several days following doxycycline-induced suppression. Furthermore, unlike in culture where signaling to down-regulation is immediate, 5-HT1A-mediated signaling to transcriptional down-regulation is gradual in vivo since 5-HT release is auto-inhibited and only gradually increases as autoreceptors become more desensitized, a process that may take weeks.

5-HT1A receptors in animal models of depression

Due to the limitations of heterogeneity in clinical samples and in the validity of animal models, our understanding of depression remains incomplete. Nevertheless, mouse models have provided valuable insights into the role of 5-HT1A receptors in depression and anxiety. Importantly, 5-HT1A-null mice display increased anxiety behaviours and are unresponsive to selective 5-HT reuptake inhibitor (SSRI). Conversely, global over-expression of the 5-HT1A receptor or enhancement of its post-synaptic signalling decreases anxiety. Rescue of post-synaptic 5-HT1A receptor expression in early postnatal forebrain restores a normal anxiety phenotype, while its inhibition from postnatal day 13-34 induces anxiety in the adult, suggesting it has a role in development of the anxiety phenotype. 5-HT1A-dependent inhibition of CAMKIIα appears to mediate the anxiety phenotype, since 5-HT1A-null mice with reduced CAMKII activation did not develop anxiety. Recently, mice with a 30% decrease in 5-HT1A autoreceptors displayed increase in 5-HT neuron firing rate and augmented 5-HT release, and reduced depression-like behavior but no change in anxiety. Hence, reduced activity of post-synaptic 5-HT1A receptors is implicated in anxiety, while an increased transcription of 5-HT1A autoreceptors associates with depression and resistance to chronic SSRI treatment.

Transcriptional Regulation of the 5-HT1A Receptor Gene

Because acute desensitization (uncoupling and internalization) occurs rapidly (sec-min) and is rapidly reversible, we postulated that reduced transcription of 5-HT1A autoreceptors could account for the three-week delay in clinical response following antidepressant treatment. Supporting this hypothesis, transgenic mice with only 30% repression of 5-HT1A autoreceptors display an enhanced and rapid response to SSRIs, suggesting that transcriptional repression of the 5-HT1A autoreceptor could be key to an effective antidepressant response. In characterizing the 5-HT1A promoter, we have uncovered a number of important regulators at the minimal promoter, upstream repressor and enhancer regions, as well as at a C(-1019)G polymorphism, that could affect 5-HT1A autoreceptor expression (Figure 4).

5-HT1A minimal promoter

To examine the transcriptional regulation of the 5-HT1A receptor gene, the promoter region has been characterized using transcriptional reporter assays in cultured cell lines. Most non-neuronal cell lines and tissues express low or undetectable levels of 5-HT1A receptors, while some neuronal cell lines express endogenous 5-HT1A receptors. In particular, the rat raphe RN46A cells are serotonergic and express 5-HT1A receptors, and can serve as a model for 5-HT1A autoreceptor regulation. While several non-serotonergic neuroblastoma cells (human SKN-SH, rodent NG108-15 and SN-48 cells) also express 5-HT1A receptors and model post-synaptic 5-HT1A receptors. The human and mouse 5-HT1A promoters lack a TATA box and have multiple transcription start sites, while the rat 5-HT1A promoter has a major TATA-driven start site. Nevertheless, the minimal promoter located within 300 bp upstream of the intronless coding sequence is highly conserved. This minimal promoter is typical of a "housekeeping" promoter and consists of a series of GC-rich enhancer elements recognized by the ubiquitous factors MAZ1 and Sp1 that drive non-selective expression of the gene in all cell types, whether they express endogenous 5-HT1A receptors or not. Within the minimal promoter, there is a conserved NFkB response element that may mediate induction of 5-HT1A expression by NFkB. NFkB is observed in several types of immune cells including B- and T-lymphocytes, neutrophils and macrophages in which basal 5-HT1A receptor levels are very low, but can be greatly induced by mitogenic stimulation to augment the mitogenic response. Finally, there is evidence that suppression of 5-HT1A receptor expression by glucocorticoids is mediated by inhibitory actions on the minimal promoter via Sp1 and NFkB elements.

5-HT1A repressor region

Located upstream from the minimal promoter is a series of repressor elements that silence 5-HT1A expression in non-neuronal cells, but also repress 5-HT1A transcription in neuronal cell lines that express 5-HT1A receptors. Importantly these elements are conserved between human, rat and mouse genes and are functional. One of the key elements is a consensus repressor element-1 (RE-1) site that is recognized by REST/NRSF, a key pan-neuronal repressor of multiple neuronal genes. REST has been shown to be crucial for silencing neuronal gene expression in neural stem cells or progenitors and non-neuronal cells, but is down-regulated upon neuronal differentiation, allowing for expression of neuronal genes. However, the 5-HT1A receptor is not expressed in all neuronal subtypes, hence additional repressors are required to restrict its expression to appropriate neurons. Located adjacent to the RE-1 site, we identified a dual repressor element (DRE, 31-bp) that mediates the strongest repression of the 5-HT1A promoter (Figure 4). In non-neuronal cells two nuclear protein complexes bind the DRE, one at the 5' end (FRE), and the other at the 3' end (TRE); however in raphe RN46A cells only the FRE-complex is present. In raphe RN46A cells, mutation of the FRE de-repressed 5-HT1A transcription by 10-fold, whereas in non-neuronal cells, deletion of the entire DRE was required. Using a yeast one-hybrid cloning approach Freud-1/CC2D1A (FRE Under Dual repression binding protein) was identified as a protein that binds and represses at the FRE site; subsequently, the homologue Freud-2/CC2D1B was identified as the second DRE-binding protein. Freud-1 and Freud-2 are colocalized with 5-HT1A receptors in neurons, where they play complementary roles to regulate the level of 5-HT1A receptor expression. In particular, Freud-1, but not Freud-2, is strongly expressed and colocalized with 5-HT and 5-HT1A receptors in raphe nuclei, while both Freud-1 and Freud-2 are colocalized with the receptor in post-synaptic areas such as cortex and hippocampus. Together, Freud-1 and Freud-2 mediate dual repression of 5-HT1A receptor expression in most cell types including many post-synaptic neurons to restrict 5-HT1A receptor expression to appropriate neurons. Based on its role in RN46A cells and its localization in 5-HT neurons in vivo, Freud-1 appears to be the dominant repressor of 5-HT1A autoreceptor expression. However, it is possible that in mental illness, other repressors may play a role. For example, REST expression is up-regulated in serotonergic raphe cells from depressed suicide as compared to control brains, and may restrain over-expression of 5-HT1A autoreceptors observed in these subjects.

Located between the minimal promoter and the upstream DRE is a region that exhibits both enhancer and repressor activities (Figure 4). Within this region, a novel type of negative glucocorticoid response element (nGRE), composed of two GRE half-sites separated by 6 nucleotides (rather than 3 nucleotides as for a typical consensus GRE) was identified. The nGRE is conserved between human, mouse and rat, although its function has only been demonstrated for the rat nGRE thus far. The 5-HT1A nGRE mediates synergistic repression by both high and low affinity glucocorticoid receptors (MR and GR), suggesting a key role in repression of 5-HT1A receptors in the hippocampus, in which both these receptors are present. In the raphe, only GR has been detected, and it appears to have a relatively weaker ability to suppress 5-HT1A receptor expression compared to hippocampus. Interestingly, 5-HT1A agonists downregulate GR in raphe cells in culture, which would lead to an increase in 5-HT1A autoreceptors. Conversely, knockdown of GR abrogates the down-regulation of 5-HT1A autoreceptors induced by chronic mild stress in mice. Since glucocorticoids are dys-regulated in depression, the chronic elevation of cortisol may ultimately desensitize GR and could contribute to increase 5-HT1A autoreceptor expression in depression.

C(-1019)G HTR1A polymorphism (rs6295)

In our analysis of the 5-HT1A promoter we identified a human C(-1019)G 5-HT1A polymorphism located within the repressor/enhancer region. The G allele and G/G genotype were associated with major depression and suicide. Since the C(-1019)G polymorphism is located in a 26-bp palindrome, we addressed whether this palindrome could bind protein in nuclear extracts of raphe RN46A cells, and showed a specific complex that preferentially recognized the C-allele over the G-allele. Using a yeast one-hybrid screen, Deaf1 (NUDR) and Hes5 were identified as repressors of the C- but not the G-allele of the 5-HT1A promoter (Figure 4). Deaf1 (Deformed autoregulatory factor-1) binds to a minimal TCG consensus sequence present in the human, rat and mouse 5-HT1A genes and can act as a repressor or enhancer. By supershift analysis, Deaf1 was detected as a major component of the RN46A nuclear protein C-allele palindrome-binding complex. When transfected in RN46A cells, Deaf1 suppressed 5-HT1A receptor transcription, and reduced 5-HT1A RNA and protein expression. However, unlike Freud-1, while mutation of the palindrome blocked Deaf1 repression, it did not de-repress basal 5-HT1A transcription compared to mutation of the FRE, suggesting that Freud-1 is the predominant repressor of the autoreceptor in RN46A cells. In the adult rat and human brain, Deaf1 is colocalized with 5-HT1A receptors, and in the raphe nuclei it is also colocalized with 5-HT. In other neuronal 5-HT1A-expressing cell types, instead of repressing 5-HT1A gene expression as seen in raphe or non-neuronal cells, Deaf1 enhances 5-HT1A expression, and the G-allele reduces basal 5-HT1A expression. Based on this dual activity of Deaf1, the G/G(-1019) genotype is expected to increase 5-HT1A autoreceptor levels to reduce 5-HT neuron firing, and decrease post-synaptic 5-HT1A receptors, thereby synergistically reducing 5-HT neurotransmission (Figure 5). In support of this, depressed subjects homozygous for the 5-HT1A G/G(-1019) genotype have increased 5-HT1A autoreceptor binding potential, which is consistent with the increase in 5-HT1A autoreceptors observed in post-mortem studies of depressed suicides. Thus, the 5-HT1A G(-1019) allele may alter 5-HT1A receptor expression in vivo by blocking Deaf1 function.

The Hes proteins, which also preferentially recognize the HTR1A C(-1019) allele, appear to play an important role in regulating early induction of the 5-HT1A autoreceptor. Hes5, and especially Hes1, repress neuronal gene expression in neural precursor cells and are down-regulated upon neuronal differentiation. We therefore addressed whether Hes1 can repress 5-HT1A receptor expression, and found that Hes1 exerts even stronger repression than either Hes5 or Deaf1. However, Deaf1 appears to be the dominant factor when the two are co-expressed. To address whether Hes1 influences 5-HT1A receptor expression in vivo, we examined embryonic midbrain tissue from the Hes1 -/- mice for 5-HT1A receptor RNA levels at the initiation of serotonergic neuronal differentiation. We found that 5-HT1A RNA was prematurely upregulated with an expanded distribution of midbrain expression. Thus, reduction in repression by both Deaf1 and Hes proteins at the G-allele of the 5-HT1A promoter could lead to upregulation of 5-HT1A autoreceptor expression beginning in early serotonergic differentiation and extending to adulthood.

The expression of Deaf1, Freud-1 and Freud-2 also appears to be dys-regulated in human depression in a region-specific manner. In serotonergic raphe cells, both Deaf1 and REST are upregulated, and 5-HT1D receptor RNA is increased, and there is a trend for increased 5-HT1A and 5-HT1B RNA. Hence, despite compensatory upregulation of repressors, there appears to be a general upregulation of 5-HT1 autoreceptor expression on serotonergic neurons. However, the G-allele would be expected to attenuate Deaf1 action on the 5-HT1A receptor gene.

Pet-1 enhancer elements

In addition to repression, 5-HT1A autoreceptor expression is subject to regulation by enhancers, the most important of which appears to be Pet-1. Pet-1 was identified as a critical regulator of 5-HT marker genes including TPH, 5-HTT, and ADC genes, and knockout of Pet-1 results in a substantial loss of serotonin in the brain, although a few 5-HT neurons appear to persist. Hence we addressed whether Pet-1 regulates 5-HT1A receptor gene transcription. There are several putative Pet-1 sites located in the 5-HT1A promoter, and deletion analysis demonstrated that while all of the sites have some activity, deletion of the upstream Pet-1 site located at -1406 bp reduced 5-HT1A promoter activity by over 90%, indicating a predominant role for this site. Consistent with a role for Pet-1 in regulation of 5-HT1A autoreceptor expression in vivo, the Pet-1 knockout mice demonstrated a nearly complete loss of 5-HT1A RNA and protein specifically in the raphe, while at post-synaptic target tissues 5-HT1A expression was modestly affected. Thus, Pet-1 functions as a major enhancer of 5-HT1A autoreceptor expression. However, since Pet-1 is also required for TPH2 expression, blocking Pet-1 would actually reduce 5-HT neurotransmission as shown in the Pet-1 knockout mice, which leads to an anxious and aggressive behavioral phenotype.

In summary, we have identified several key transcription factors, including REST, Freud-1, GR, Deaf1, Hes1 and Pet-1, which coordinately regulate 5-HT1A autoreceptor expression and its modulation by glucocorticoids, 5-HT, and other neurotransmitters.

5-HT1A Autoreceptors in Human Depression

Given the role of 5-HT1A autoreceptors in regulation of the serotonin system and the importance of 5-HT in clinical depression, several approaches have addressed whether 5-HT1A receptor expression is altered in depression. In depressed subjects, the observed increases in 5-HT1A autoreceptors could be due to increased 5-HT1A autoreceptor transcription, while region-specific reductions in post-synaptic 5-HT1A receptors could result from reduced transcription in these regions. These changes in 5-HT1A receptors would result in a global reduction in 5-HT neurotransmission, and predisposition to depression (Figure 5). In agreement with this idea, the G(-1019) 5-HT1A allele, which leads to increased 5-HT1A autoreceptor transcription, has been associated with major depression and suicide, and this association has been replicated and extended in most, but not all studies. The 5-HT1A G(-1019) allele has also been associated with anxiety. Importantly, the 5-HT1A G/G genotype is associated with increased 5-HT1A autoreceptors in depressed subjects, suggesting that 5-HT1A G(-1019) allele is a risk factor for depression by increasing 5-HT1A autoreceptor levels to reduce 5-HT neurotransmission. Interestingly, studies in normal subjects have not found an association of the G/G genotype with depressed or anxious mood. Furthermore, in normal subjects, although a trend for increased 5-HT1A autoreceptor levels with the G/G genotype is observed, it was not statistically significant. These results suggest that although the G-allele may promote higher expression of 5-HT1A autoreceptors (Figure 5), normal subjects are able to compensate for the effect of the G allele, while depressed patients are not. For example, the absolute level of 5-HT1A receptors may differ between depressed and normal subjects due to differences in the regulation of 5-HT1A expression (e.g., by increased glucocorticoids) or in the expression of 5-HTT, TPH2, MAO or other genes that influence the amount of 5-HT that is present extracellularly in the raphe and would indirectly affect the level of 5-HT1A autoreceptors through regulating autoreceptor desensitization. In addition, it is possible that impairment of Deaf1 action could account for increased levels of 5-HT1A autoreceptors in G/G subjects, and could also mediate a reduction in post-synaptic 5-HT1A receptors, suggesting Deaf1 as a potentially important mediator of transcriptional dys-regulation of the 5-HT1A receptor gene in depression.

An increase in 5-HT1A autoreceptor levels delays or prevents antidepressant response and 3 weeks of treatment with antidepressants is required for clinical improvement, due to recurrent inhibition of raphe activity by the 5-HT1A autoreceptor (Figure 2). One strategy to overcome negative feedback by 5-HT1A autoreceptor has been to use 5-HT1A partial agonists such as pindolol or buspirone, to block or desensitize the autoreceptor and accelerate SSRI action. However, these compounds have insufficient specificity since they affect both pre-and post-synaptic receptors, and display only partial specificity for 5-HT1A autoreceptors. We and others have found that the G(-1019) allele associates with reduced antidepressant response, suggesting that regulation by Deaf1 could facilitate antidepressant response. Successful treatment of panic disorder patients with chronic SSRIs correlates with a normalization of pre- and post-synaptic 5-HT1A receptors, suggesting that down-regulation of pre-synaptic receptors concomitant with an up-regulation of post-synaptic 5-HT1A receptors may be critical for treatment response. Among the transcriptional regulators of the 5-HT1A promoter, Deaf1 is of particular interest since it displays repressor activity on 5-HT1A autoreceptor expression, but enhancer activity on post-synaptic 5-HT1A receptors, a combination of activities that would normalize pre- and post-synaptic 5-HT1A receptor levels to enhance serotonergic neurotransmission.

Conclusion

In conclusion, since dys-regulation of the 5-HT1A autoreceptor has the potential to affect the activity of the entire 5-HT system, it is critical to identify the transcriptional mechanisms underlying its long-term regulation. Understanding the transcription factors involved may provide important clues to the molecular mechanisms responsible for 5-HT1A receptor dys-regulation in mental illness. Transcriptional regulators of the 5-HT1A autoreceptor may also constitute important targets to restore normal levels of the receptor and improve treatment outcome for depression and related mental illnesses.

Competing interests

The authors declare that they have no competing interests.

Authors' contributions

PA conceived of the topic, searched the literature and drafted the manuscript. BF and AM provided specific sections and corrections. All authors read and approved the final manuscript.

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    Rabiner EA Bhagwagar Z Gunn RN Cowen PJ Grasby PM Preferential 5-HT(1A) Autoreceptor Occupancy by Pindolol is Attenuated in Depressed Patients: Effect of Treatment or an Endophenotype of Depression?Neuropsychopharmacology2004 2916881698

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    Michelson RJ Collard MW Ziemba AJ Persinger J Bartholomew B Huggenvik JI Nuclear DEAF-1-related (NUDR) protein contains a novel DNA binding domain and represses transcription of the heterogeneous nuclear ribonucleoprotein A2/B1 promoterJ Biol Chem1999 2743051030519

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    Parsey RV Oquendo MA Ogden RT Olvet DM Simpson N Huang YY Van Heertum RL Arango V Mann JJ Altered serotonin 1A binding in major depression: a [carbonyl-C-11]WAY100635 positron emission tomography studyBiol Psychiatry2006 59106113

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    Parsey RV Ogden RT Miller JM Tin A Hesselgrave N Goldstein E Mikhno A Milak M Zanderigo F Sullivan GM Higher Serotonin 1A Binding in a Second Major Depression Cohort: Modeling and Reference Region ConsiderationsBiol Psychiatry2010 68170178

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    Kageyama R Ohtsuka T Hatakeyama J Ohsawa R Roles of bHLH genes in neural stem cell differentiationExp Cell Res2005 306343348

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    Jacobsen KX Vanderluit J Slack RS Albert PR HES1 regulates 5-HT1A receptor gene transcription at a functional polymorphism: Essential role in developmental expressionMol Cell Neurosci2008 38349358

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    Iyo AH Kieran N Chandran A Albert PR Wicks I Bissette G Austin MC Differential regulation of the serotonin 1 A transcriptional modulators five prime repressor element under dual repression-1 and nuclear-deformed epidermal autoregulatory factor by chronic stressNeuroscience2009 16311191127

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    Hendricks T Francis N Fyodorov D Deneris ES The ETS domain factor Pet-1 is an early and precise marker of central serotonin neurons and interacts with a conserved element in serotonergic genesJ Neurosci1999 191034810356

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    Hendricks TJ Fyodorov DV Wegman LJ Lelutiu NB Pehek EA Yamamoto B Silver J Weeber EJ Sweatt JD Deneris ES Pet-1 ETS gene plays a critical role in 5-HT neuron development and is required for normal anxiety-like and aggressive behaviorNeuron2003 37233247

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    Jacobsen KX Czesak M Deria M Le Francois B Albert PR Region-specific regulation of 5-HT1A receptor expression by Pet-1-dependent mechanisms in vivoJ Neurochem2011 11610661076

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    Yadav PN Abbas AI Farrell MS Setola V Sciaky N Huang XP Kroeze WK Crawford LK Piel DA Keiser MJ The Presynaptic Component of the Serotonergic System is Required for Clozapine's EfficacyNeuropsychopharmacology2011 36638651

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    Kishi T Tsunoka T Ikeda M Kawashima K Okochi T Kitajima T Kinoshita Y Okumura T Yamanouchi Y Inada T Serotonin 1A receptor gene and major depressive disorder: an association study and meta-analysisJ Hum Genet2009 54629633

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    Anttila S Huuhka K Huuhka M Rontu R Hurme M Leinonen E Lehtimaki T Interaction between 5-HT1A and BDNF genotypes increases the risk of treatment-resistant depressionJ Neural Transm2007 11410651068

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    Kraus MR Al-Taie O Schafer A Pfersdorff M Lesch KP Scheurlen M Serotonin-1A receptor gene HTR1A variation predicts interferon-induced depression in chronic hepatitis CGastroenterology2007 13212791286

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    Zetzsche T Preuss UW Bondy B Frodl T Zill P Schmitt G Koutsouleris N Rujescu D Born C Reiser M 5-HT1A receptor gene C -1019 G polymorphism and amygdala volume in borderline personality disorderGenes Brain Behav2008 7306313

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    Lenze EJ Shardell M Ferrell RE Orwig D Yu-Yahiro J Hawkes W Fredman L Miller R Magaziner J Association of serotonin-1A and 2A receptor promoter polymorphisms with depressive symptoms and functional recovery in elderly persons after hip fractureJ Affect Disord2008

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    Wu Y Xu Y Sun Y Wang YF Li X Lang XE Wang WP Zhang KR Association between the serotonin 1A receptor C(-1019)G polymorphism and major depressive disorder in the northern Han ethnic group in ChinaChin Med J (Engl)2008 121874876

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    Hettema JM An SS van den Oord EJ Neale MC Kendler KS Chen X Association study between the serotonin 1A receptor (HTR1A) gene and neuroticism, major depression, and anxiety disordersAm J Med Genet B Neuropsychiatr Genet2008 147B661666

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    Domschke K Braun M Ohrmann P Suslow T Kugel H Bauer J Hohoff C Kersting A Engelien A Arolt V Association of the functional -1019C/G 5-HT1A polymorphism with prefrontal cortex and amygdala activation measured with 3 T fMRI in panic disorderInt J Neuropsychopharmacol2006 9349355

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    Fakra E Hyde LW Gorka A Fisher PM Munoz KE Kimak M Halder I Ferrell RE Manuck SB Hariri AR Effects of HTR1A C(-1019)G on amygdala reactivity and trait anxietyArch Gen Psychiatry2009 663340

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    Rothe C Gutknecht L Freitag C Tauber R Mossner R Franke P Fritze J Wagner G Peikert G Wenda B Association of a functional 1019CG 5-HT1A receptor gene polymorphism with panic disorder with agoraphobiaInt J Neuropsychopharmacol2004 7189192

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    Choi WS Lee BH Yang JC Kim YK Association Study between 5-HT1A Receptor Gene C(-1019)G Polymorphism and Panic Disorder in a Korean PopulationPsychiatry Investig2010 7141146

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    Chipman P Jorm AF Tan XY Easteal S No association between the serotonin-1A receptor gene single nucleotide polymorphism rs6295C/G and symptoms of anxiety or depression, and no interaction between the polymorphism and environmental stressors of childhood anxiety or recent stressful life events on anxiety or depressionPsychiatr Genet2010 20813

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    David SP Murthy NV Rabiner EA Munafo MR Johnstone EC Jacob R Walton RT Grasby PM A functional genetic variation of the serotonin (5-HT) transporter affects 5-HT1A receptor binding in humansJ Neurosci2005 2525862590

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    Mann JJ Brent DA Arango V The neurobiology and genetics of suicide and attempted suicide: a focus on the serotonergic systemNeuropsychopharmacology2001 24467477

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    Stockmeier CA Involvement of serotonin in depression: evidence from postmortem and imaging studies of serotonin receptors and the serotonin transporterJ Psychiatr Res2003 37357373

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    Cremers TI Wiersma LJ Bosker FJ den Boer JA Westerink BH Wikstrom HV Is the beneficial antidepressant effect of coadministration of pindolol really due to somatodendritic autoreceptor antagonism?Biol Psychiatry2001 501321

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    Arborelius L Linner L Wallsten C Ahlenius S Svensson TH Partial 5-HT1A receptor agonist properties of (-)pindolol in combination with citalopram on serotonergic dorsal raphe cell firing in vivoPsychopharmacology (Berl)2000 1517784

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    Haddjeri N de Montigny C Blier P Modulation of the firing activity of rat serotonin and noradrenaline neurons by (+/-)pindololBiol Psychiatry1999 4511631169

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    Martinez D Hwang D Mawlawi O Slifstein M Kent J Simpson N Parsey RV Hashimoto T Huang Y Shinn A Differential occupancy of somatodendritic and postsynaptic 5HT(1A) receptors by pindolol: a dose-occupancy study with [11C]WAY 100635 and positron emission tomography in humansNeuropsychopharmacology2001 24209229

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    Serrats J Artigas F Mengod G Cortes R An autoradiographic study of the influence of pindolol upon [35S]GTPgammaS binding in rat, guinea pig and human brainInt J Neuropsychopharmacol2004 72734

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    Lemonde S Du L Bakish D Hrdina P Albert PR Association of the C(-1019)G 5-HT1A functional promoter polymorphism with antidepressant responseInt J Neuropsychopharmacol2004 7501506

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