Aspirin enhances IFN-α-induced growth inhibition and apoptosis of hepatocellular carcinoma via JAK1/STAT1 pathway.

TitleAspirin enhances IFN-α-induced growth inhibition and apoptosis of hepatocellular carcinoma via JAK1/STAT1 pathway.
Publication TypeJournal Article
Year of Publication2013
AuthorsLi T, Dong Z-R, Guo Z-Y, Wang C-H, Tang Z-Y, Qu S-F, Chen Z-T, Li X-W, Zhi X-T
JournalCancer gene therapy
Volume20
Issue6
Pagination366-74
Date Published2013 Jun
Abstract

STAT1 has a key role in exerting the antiproliferative and proapoptotic effects of interferon (IFN)-α on tumors, and its defects in expression is associated with IFN-α resistance. In this study we want to investigate whether aspirin can improve the antitumor efficiency of IFN-α on hepatocellular carcinoma (HCC) through the activation of STAT1. We found that aspirin not only significantly enhanced IFN-α-induced antiproliferation and apoptosis of HCC in vitro study but also enhanced tumor growth inhibition in nude mice. Although IFN-α alone resulted in significant phosphorylation of both STAT1 and STAT3, aspirin only prompted the IFN-α-induced phosphorylation of STAT1. Further study revealed that aspirin-prompted phosphorylation of STAT1 was activated through phosphorylation of JAK1. Furthermore, aspirin-activated STAT1 upregulated the transcription of proapoptotic IFN-stimulated gene (ISG) of X-linked inhibitor of apoptosis-associated factor-1 and downregulated the transcription of antiapoptotic ISG of G1P3, which in turn promoted the expression of Bax and activation of caspase-9 and caspase-3, thereby sensitizing HCC cells to IFN-α-induced apoptosis. Taken together, our findings suggest a novel strategy of using aspirin to overcome tumor resistance and enhance the effectiveness of IFN-α in HCC treatment through activating STAT1 gene, and have potential implications for improving future IFN-α protein and gene therapy.

DOI10.1021/la401531r
Alternate JournalCancer Gene Ther.