Abstract
Nuclear factor-kappaB (NF-κB) is a transcription factor that is activated in various neoplasms, including gastric cancer. Insulin-like growth factor binding protein-3 (IGFBP-3) is a potent tumor suppressor and is significantly suppressed in a variety of cancers. Although IGFBP-3 has been reported to have antiproliferative and proapoptotic effects, the precise mechanisms underlying the action of IGFBP-3 have not been elucidated. In this study, we found an inverse correlation between NF-κB activity and IGFBP-3 expression in patients with gastric cancer. Overexpression of IGFBP-3 resulted in significant inhibition of total and phosphorylated p65 NF-κB and IκB proteins in gastric cancer cells. IGFBP-3 further inhibited the expression of NF-κB-regulated cell adhesion molecules, ICAM-1 and VCAM-1. Finally, the growth inhibition induced by etoposide was significantly enhanced by IGFBP-3 overexpression along with concomitant suppression of NF-κB activity. These findings indicate that IGFBP-3 enhances etoposide-induced cell growth inhibition by blocking the NF-κB signaling pathway in gastric cancer cells. Furthermore, our data suggest that IGFBP-3 could be used as an adjuvant in the treatment of gastric cancer.
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Acknowledgments
We would like to gratefully thank professor Y. Oh (Virginia Commonwealth University, Virginia, USA) for helpful discussion and insights.
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Kim, M.S., Lee, DY. Insulin-like growth factor binding protein-3 enhances etoposide-induced cell growth inhibition by suppressing the NF-κB activity in gastric cancer cells. Mol Cell Biochem 403, 107–113 (2015). https://doi.org/10.1007/s11010-015-2341-2
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DOI: https://doi.org/10.1007/s11010-015-2341-2