Aim:This study aimed to observe the effect of combining ellagic acid (EA), a natural phenol present in fruits and vegetables, and temozolomide (TMZ) on the proliferation and expression profile of C6 glioma cell line.
Material and Methods:Rat C6 glioma cells were treated with 100-µM EA combined with 100 µM TMZ for 24, 48, and 72 h. Cell proliferation and p53 and caspase-3 protein levels were evaluated using immunocytochemistry. Multi drug resistance 1 (MDR1), O6-methylguanine-DNA methyltransferase (MGMT), and apoptotic protein (caspase-3 and p53) expressions were assessed using reverse transcription polymerase chain reaction (RT-PCR).
Results:EA combined with TMZ conspicuously reduced the cell viability at all incubation times (P < 0.001). EA significantly downregulated MGMT expression regardless of the presence of TMZ even at early hours (P < 0.001). The combination therapy reduced MDR1 expression only on 48 h in comparison with TMZ alone. EA alone upregulated caspase-3 at 48 h but upregulated p53 at 48 and 72 h. The combined therapy enhanced the immunoreactivities of p53 and caspase-3 proteins independent of the treatment durations but not of the genes.
Conclusion:EA combined with TMZ may have a potential antiproliferative efficacy by inhibiting MGMT expression and activating apoptotic protein, p53 and caspase-3, expression.