Capsaicin is a novel blocker of constitutive and interleukin-6-inducible STAT3 activation - PubMed (original) (raw)
Capsaicin is a novel blocker of constitutive and interleukin-6-inducible STAT3 activation
Manisha Bhutani et al. Clin Cancer Res. 2007.
Expression of concern in
- Editor's Note: Capsaicin Is a Novel Blocker of Constitutive and Interleukin-6-Inducible STAT3 Activation.
[No authors listed] [No authors listed] Clin Cancer Res. 2018 Sep 1;24(17):4346. doi: 10.1158/1078-0432.CCR-18-2524. Clin Cancer Res. 2018. PMID: 30181391 No abstract available.
Abstract
Purpose: Capsaicin, a constituent of green and red peppers, has been linked with suppression of tumorigenesis through a mechanism that is not well understood. Because the transcription factor signal transducer and activator of transcription 3 (STAT3) has been closely linked with tumorigenesis, we investigated the effect of this vanilloid on the STAT3 pathway in human multiple myeloma cells.
Experimental design: The effect of capsaicin on both constitutive and interleukin-6-induced STAT3 activation, associated protein kinases, and STAT3-regulated gene products involved in proliferation, survival and angiogenesis, cellular proliferation, and apoptosis in multiple myeloma cells was investigated.
Results: We found that capsaicin inhibited constitutive activation of STAT3 in multiple myeloma cells in a dose- and time-dependent manner, with minimum effect on STAT5. Capsaicin also inhibited the interleukin-6-induced STAT3 activation. The activation of Janus-activated kinase 1 and c-Src, implicated in STAT3 activation, was also inhibited by the vanilloid, with no effect on extracellular signal-regulated kinase 1/2 activation. Pervanadate reversed the capsaicin-induced down-regulation of STAT3, suggesting the involvement of a protein tyrosine phosphatase. Capsaicin down-regulated the expression of the STAT3-regulated gene products, such as cyclin D1, Bcl-2, Bcl-xL, survivin, and vascular endothelial growth factor. Finally, capsaicin induced the accumulation of cells in G(1) phase, inhibited proliferation, and induced apoptosis, as indicated by caspase activation. Capsaicin also significantly potentiated the apoptotic effects of Velcade and thalidomide in multiple myeloma cells. When administered i.p., capsaicin inhibited the growth of human multiple myeloma xenograft tumors in male athymic nu/nu mice.
Conclusion: Overall, these results suggest that capsaicin is a novel blocker of the STAT3 activation pathway, with a potential role in the prevention and treatment of multiple myeloma and other cancers.
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