The chemoadjuvant potential of grape seed procyanidins on p53-related cell death in oral cancer cells

J Oral Pathol Med (2012) 41: 322–331 Background: To clarify the efficacy of grape seed procyanidin (GSP) on antiproliferative effects related to p53 functional status of oral squamous cell carcinoma (OSCC) for its chemoadjuvant potential. Methods: We used GSP to investigate SCC‐25 cells with wild‐type p53 gene and OEC‐M1 cells with mutant p53 gene for the assessment of antiproliferative effects including cell viability, cell cycle, apoptosis, migration and invasion potential, and alterations of associated oncoproteins involved in cellular and molecular events. Results: The findings suggest that GSP on OEC‐M1 cells leads to cell cycle arrest by increasing the expression of p21Cip1/p27Kip1 protein without functioning mitochondria‐mediated apoptosis, whereas GSP on SCC‐25 cells inhibits cell proliferation via both G1‐phase arrest and mitochondria‐mediated apoptosis in a dose‐dependent manner as a result of alterations of Bcl‐2. GSP also inhibits the migration and invasion of both cells, which are associated with the suppression of matrix metalloproteinases (MMPs), MMP‐2 and MMP‐9. Conclusion: Antiproliferative effectiveness of GSP is closely associated with the p53 status of OSCC cells. GSP displays chemoadjuvant potential via cell cycle blockage and apoptotic induction. Our findings clearly suggest that GSP may play a role as a novel chemopreventive or therapeutic agent for OSCC.