Blocking Bcl-2 Leads to Autophagy Activation and Cell Death of the HEPG2 Liver Cancer Cell Line

Background: Apoptosis may be induced after Bcl-2 expression is inhibited in proliferative cancer cells. Thisstudy focused on the effect of autophagy activation by ABT737 on anti-tumor effects of epirubicin.
Methods:Cytotoxic effects of ABT737 on the HepG2 liver cancer cell line were assessed by MTT assay and cell apoptosisthrough flow cytometry. Mitochondrial membrane potential was measured by fluorescence microscopy.Monodansylcadaverin (MDC) staining was used to detect activation of autophagy. Expression of p53, p62, LC3,and Beclin1, apoptotic or autophagy related proteins, was detected by Western blotting.
Results: ABT737 andepirubicin induced growth inhibition in HepG2 cells in a dose- and time-dependent manner. Both ABT737 andepirubicin alone could induce cell apoptosis with a reduction in mitochondrial membrane potential as well asincreased apoptotic protein expression. Further increase of apoptosis was detected when HepG2 cells were cotreatedwith ABT373 and epirubicin. Furthermore, our results demonstrated that ABT373 or epirubicin ccouldactivate cell autophagy with elevated autophagosome formation, increased expression of autophagy relatedproteins and LC3 fluorescent puncta.
Conclusions: ABT737 influences cancer cells through both apoptoticand autophagic mechanisms, and ABT737 may enhance the effects of epirubicin on HepG2 cells by activatingautophagy and inducing apoptosis.