| Summary: | The data presented illustrated the in vitro anti-proliferative effect of the PSG toxin from the cuttlefish, Sepia pharaonis. The cytostatic potentials of the PSG toxin were determined by the lymphocyte migration inhibition assay. The PSG toxin (50 μg/ml) exhibited commendable inhibition of the migration of lymphocytes across the agarose gel matrix under the presence of lipopolysaccharide mitogen, with a mean migration index of 0.625. The cytotoxicity of the PSG toxin against selected cancer cell lines was determined using the MTT assay. The PSG toxin exhibited dose-dependent cytotoxicity against the MCF-7 breast cancer cells followed by KB (oral), HeLa (cervical) and A549 (lung) cancer cell lines. The PSG toxin also exhibited proportional release of LDH leakage by mitochondrial damage with an IC50 of 13.85 μM against MCF-7 breast cancer cells. The in vitro anticancer activity of the PSG toxin against the selected cell lines was evaluated by Karthik et al. (2017) [1]. Keywords: PSG toxin, Anticancer, Anti-proliferative, Breast cancer, MTT assay, LDH leakage assay
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