| Introduction:
spite of many reports about the anticancer effect of these bacteria in in–vivo and in–vitro, their mechanisms of action are not completely
understood. The goal of this study was to compare the extracellular fractions of Lactobacillus casei and L. paracasei on the anti proliferation
and apoptosis induction in K562 cell line.
Materials and Methods: L. casei and L. paracasei were cultured in MRS broth medium. Then extracellular secretions were collected
column, and the anticancer properties were evaluated.
Results: The results of SDS–PAGE showed various molecular weight of fractionated proteins of L. casei and L. paracasei. Bioactivity
assessment illustrated that anti proliferative effects on K562 cells is dose and time dependent and the cytotoxic effects was parallel with
protein concentration and the increase of time from 36 to 72 hours.
Conclusion: Regarding the cell cytotoxicity results, the fractionated extracellular proteins of L. casei and L. paracasei
effects in inhibition of cancer cell proliferation. However, more study is needed to better elucidate the mechanisms of extracted proteins,
and its effect on other human cancer cell lines. |