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Cancer Genes and Genomics

Calcyclin-Binding Protein Inhibits Proliferation, Tumorigenicity, and Invasion of Gastric Cancer

¹ State Key Laboratory of Cancer Biology and Institute of Digestive Diseases, Departments of ² Geriatrics and ³ Nephrology, Xijing Hospital, the Fourth Military Medical University, Xi'an, Shaanxi, China; and ⁴ Department of Gastroenterology, Wuhan General Hospital of Guangzhou Command, Wuhan, Hubei, China

Requests for reprints: Kaichun Wu and Daiming Fan, Institute of Digestive Diseases, Xijing Hospital, the Fourth Military Medical University, Xi'an 710032, Shaanxi Province, China. Phone: 86-29-8477-5230; Fax: 86-29-8253-9041. E-mail: ningsun{at}fmmu.edu.cn

Calcyclin-binding protein/Siah-1–interacting protein (CacyBP/SIP), a target protein of the S100 family, which includes S100A6, S100A1, S100A12, S100B, and S100P, has been identified as a component of a novel ubiquitinylation complex leading to β-catenin degradation. However, the function of CacyBP/SIP in gastric cancer has not been elucidated. In the present study, we prepared CacyBP/SIP overexpressing and knockdown cell lines of gastric cancer. Forced CacyBP/SIP expression inhibited the proliferation of gastric cancer cells, suppressed tumorigenicity in vitro, and prolonged the survival time of tumor-bearing nude mice. In addition, increased CacyBP/SIP repressed the invasive potential of gastric cancer cells. Conversely, the down-regulation of CacyBP/SIP by RNA interference showed the opposite effects. Further studies showed that depressed CacyBP/SIP increased the expression of total and nuclear β-catenin at the protein level and elevated the transcriptional activity of Tcf/LEF. Taken together, our results suggest that CacyBP/SIP may be a potential inhibitor of cell growth and invasion in the gastric cancer cell, at least in part through the effect on β-catenin protein expression and transcriptional activation of Tcf/LEF. (Mol Cancer Res 2007;5(12):1254–62)