Antimicrobial and anticancer properties of Carica papaya leaves derived di-methyl flubendazole mediated silver nanoparticles

Background: In this study, a biologically active molecule, di-methyl flubendazole isolated from the extract of Carica papaya leaves confirmed by using GC–MS, 1H NMR, and 13C NMR analysis was applied to synthesize silver nanoparticles (AgNPs). The AgNPs with plant sources an alternative therapeutic agent for synthetic compound used in cancer chemotherapy. Methods: The AgNPs were characterized using UV, FT-IR, XRD, FESEM with EDX and TEM. The antibacterial effects of AgNPs were determined with agar well diffusion method. The MTT assay used to evaluate the inhibitory effect cell lines. The acridine orange and ethidium bromide and DAPI have used cell morphological effects. Results: The AgNPs were mono-crystalline and their size ranged from 7 to 22 nm. AgNPs showed good antibacterial activity against both Gram-positive and Gram-negative bacteria. Studies on the antiproliferative potential of bioinspired AgNPs in cancer cell lines revealed that the antiproliferative effect was much stronger in HepG2 than in MCF-7 and A549 cell lines. Similarly, AgNPs exerted less cytotoxic activity in Vero cells (normal cells). AgNPs-treated cells showed necrosis, apoptotic morphology evidenced by cell shrinkage, membrane blebbing, cell decay, and necrosis. HepG2 cells treated with biosynthesized AgNPs exhibited a G0/G1 phase (52–53.37%) blockage. Compared to the control, AgNP-treated HepG2 cells showed elevated ®-actin levels; however, Bcl-2 was significantly down regulated in AgNP-treated cells, indicating the involvement of Bcl-2 in apoptosis. Conclusion: Overall, the fact that di-methyl flubendazole-based silver nanoparticles showed a novel and cost-effective natural antitumor and antibacterial agent.

Abstract licence: CC BY-NC-ND

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