Objective: This study was designed to investigate the
effects of ε-viniferin (ε-VNF) on the mitochondrial pathway of apoptosis
and on late apoptosis in HepG2 cell lines. To observe these effects,
ε-VNF and vincristine sulfate (VNC), anti-cancer drugs used for
treatment on HepG2 cells, were administered either alone or in
combination at different time intervals.
Methods: Mitochondrial membrane potential changes in
the cells (ΔΨm) were evaluated using cationic dye JC-1, while Bax, Bcl-2
expression levels with RT-PCR and caspase-3 activity were analyzed
using a kit. For detection of apoptotic activity, an in situ TUNEL assay
was performed.
Results: When 98.3µM ε-VNF, 52.5µM VNC and the
11.25+15.8µM VNC+ε-VNF combination were compared with the control group,
ΔΨm changes at the 6th hour were found to be 19.5%, 5.5%, 24.6%, and
3.5% , respectively. These finding show that the combination group
(24.6%) resulted in early apoptosis of the cell at the 6th hour. Bax
mRNA expression increased at the 24th hour in the VNC+ε-VNF group
compared to control group (160%), and caspase-3 activation increased in
the 1.25+15.8 µM[VNC+ε-VNF] group compared to the control group at the
48th hour. The detection of DNA fragments in HepG2 cells within 24 hours
suggests direct apoptosis.
Conclusion: These findings demonstrate that the doses
administered to the VNC+ε-VNF combination group were lower than those
administered to groups using one agent alone (e.g. VNC), the results of
which reduce the possibility of administering toxic doses.
Journal Section | Research Articles |
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Authors | |
Publication Date | December 25, 2016 |
Submission Date | January 11, 2017 |
Published in Issue | Year 2016 Volume: 43 Issue: 4 |