Abstract
Background
Diallyl disulfide (DADS), a principal organosulfur component of garlic, is known for its medicinal properties including anti-cancer activity. Prior studies have demonstrated that the compounds containing Diallyl disulfide moieties exhibited diverse therapeutic potential with promising biological activities. In the present study, we have investigated the in vitro anticancer activity of Diallyl disulfide derivatives (5a–5 l and 7e-7m) against human cancer cell lines.
Methods
The effect of DADS analogs on different cancer cell lines was measured through MTT assay. Cell cycle progression, apoptosis, DNA fragmentation and levels of ROS were analyzed through FACS and confocal imaging.
Results
Bis[3-(3-fluorophenyl)prop-2-ene]disulfide (compound 5b) was the most potent compound among the tested DADS derivatives. FACS analysis revealed that increase in ROS generation by compound 5b was accompanied by cell cycle arrest in the G2/M phase and apoptosis in MIA PaCa-2 cells. Further, the apoptosis was confirmed by TUNEL assay. Western blot analysis showed that compound 5b induces G2/M phase arrest via ROS mediated DNA-damage, which in turn, induces phosphorylation of Chk1/Cdc25c/Cdc2 pathway. Furthermore, altered levels of ROS triggers intrinsic apoptotic cascade, as evidenced by dissipated mitochondrial membrane potential (ψ), decrease in Bcl-2/Bax ratio, cytochrome c release and cleavage of procaspase-3. Scavenging of ROS by antioxidant N-acetyl-cysteine (NAC) reversed the compound 5b induced augmented intracellular ROS levels and cell death.
Conclusion
Taken together, the anti-proliferative effects of compound 5b were attributed to intracellular ROS accumulation, which in turn, triggers apoptosis by mediating DNA damage-induced G2/M phase arrest and evoking mitochondrial apoptotic pathway in MIA PaCa-2 cells.
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Saini, V., Manral, A., Arora, R. et al. Novel synthetic analogs of diallyl disulfide triggers cell cycle arrest and apoptosis via ROS generation in MIA PaCa-2 cells. Pharmacol. Rep 69, 813–821 (2017). https://doi.org/10.1016/j.pharep.2017.03.006
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DOI: https://doi.org/10.1016/j.pharep.2017.03.006