Saffron carotenoids inhibit STAT3 activation and promote apoptotic progression in IL-6-stimulated liver cancer cells.

Saffron carotenoids inhibit STAT3 activation and promote apoptotic progression in IL-6-stimulated liver cancer cells. Oncol Rep. 2018 Jan 25;: Authors: Kim B, Park B Abstract Signal transducer and activator of transcription 3 (STAT3) is involved in the survival, proliferation, angiogenesis, invasion and metastasis of tumor cells. In addition, interleukin-6 (IL-6) has been reported to be closely related to STAT3 activity. In the present study, we investigated whether crocin, a major glycosylated carotenoid derived from saffron, can modulate the IL-6/STAT3 pathway to induce growth inhibition and sensitivity to cancer cell apoptosis. We determined that crocin inhibited STAT3 activation induced by IL-6 in hepatocellular carcinoma Hep3B and HepG2 cells. STAT3 suppression was mediated through the inactivation of Janus kinase 1/2(JAK1, JAK2) and Src kinase in both liver cancer cell lines. Furthermore, crocin induced the expression of protein tyrosine phosphatase (PTP) SHP-1, which led to STAT3 dephosphorylation. Deletion of the SHP-1 gene by siRNA recovered the inhibitory effects of crocin, suggesting an important role for SHP-1. Moreover, crocin downregulated the expression of STAT3-regulated anti-apoptotic (Bcl-2, survivin), proliferative (cyclin D1), invasive (CXCR4) and angiogenic (VEGF) proteins. Conversely, crocin increased the pro-apoptotic (BAX) protein, which was correlated with the induction of apoptosis and inhibition of prolif...
Source: Oncology Reports - Category: Cancer & Oncology Tags: Oncol Rep Source Type: research