Cytotoxic effects and Identification of bioactive metabolites from crude extract of potential probiotic bacterium, Bacillus amyloliquefacians CS4, isolated from the gut of freshwater fish Channa striata (Bloch, 1793)

Abstract

Received: 23/May/2019, Accepted: 15/Jun/2019, Online: 30/Jun/2019 Abstract— In the present study, the crude secondary metabolites were extracted from the potential probiotic bacterium, Bacillus amyloliquefacians CS4 using solvent ethyl acetate and the cytotoxicity of bacterial extract was assessed against HeLa cell line through MTT assay. The crude extract exhibited cytotoxicity effect on HeLa cell lines with the effective half maximal inhibitory concentration (IC50) value of 121.65μg/ml. The brine shrimp toxicity assay of crude extract revealed half maximal lethal concentration (LC50) value at 93.377μg/ml against Artemia salina. The zebra fish (Danio rerio) embryos were treated with different concentrations of extract upto 72 hpf and was found lowest survivability (36.6 %) at 200μg/ml concentration. The bioactive compounds and their functional groups of crude extract were identified using GC-MS and FTIR analyses. The secondary metabolites produced by B. amyloliquefacians CS4 have caused potential cytotoxic effects on cancer cell line and these compounds could be possibly used for the development of therapeutic agents, in relation to cancer drug discovery.