Zhai Huihong, Shi Yongquan, Jin Haifeng, Li Yuanfei, Lu Yuanyuan, Chen Xiong, Wang Jinbo, Ding Liping, Wang Xin, Fan Daiming
State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
J Histochem Cytochem. 2008 Aug;56(8):765-72. doi: 10.1369/jhc.2008.950519. Epub 2008 Apr 28.
Calcyclin-binding protein (CacyBP)/Siah-1 interacting protein (SIP), a component of ubiquitin-mediated proteolysis, could bind the Skp1-Cul1-F box protein complex. Although CacyBP/SIP was implicated in p53-induced beta-catenin degradation, its exact function was still unknown. Our previous studies showed that CacyBP/SIP could modulate the multidrug-resistant phenotype of gastric cancer cells and was highly expressed in gastric cancer tissues compared with that in non-cancerous tissues. In this study, CacyBP/SIP protein expression profile in a broad range of human normal tissues and carcinomas was analyzed by immunohistochemistry staining with anti-CacyBP/SIP monoclonal antibody first produced in our laboratory. CacyBP/SIP was generally localized in the cytoplasm/nucleus. Positive staining of CacyBP/SIP was found in brain, heart, lymph node, and esophagus. Weak staining was shown in the rectum and kidney. No CacyBP/SIP was detected in other normal tissues. However, CacyBP/SIP was ubiquitously detected in all kinds of tumor tissues and was highly expressed in nasopharyngeal carcinoma, osteogenic sarcoma, and pancreatic cancer. To our knowledge, this is the first study on the CacyBP/SIP expression pattern in a broad range of human normal and tumor tissues. The data presented should serve as a useful reference for other investigators in future studies of CacyBP/SIP functions. Hopefully, this knowledge will lead to discovery of more roles of CacyBP/SIP in tumorigenesis.
钙周期蛋白结合蛋白(CacyBP)/Siah-1相互作用蛋白(SIP)是泛素介导的蛋白水解的一个组成部分,它可以与Skp1-Cul1-F盒蛋白复合物结合。尽管CacyBP/SIP与p53诱导的β-连环蛋白降解有关,但其确切功能仍不清楚。我们之前的研究表明,CacyBP/SIP可以调节胃癌细胞的多药耐药表型,并且与非癌组织相比,在胃癌组织中高表达。在本研究中,首先用我们实验室制备的抗CacyBP/SIP单克隆抗体通过免疫组织化学染色分析了CacyBP/SIP蛋白在广泛的人类正常组织和癌组织中的表达谱。CacyBP/SIP通常定位于细胞质/细胞核。在脑、心脏、淋巴结和食管中发现了CacyBP/SIP的阳性染色。在直肠和肾脏中显示弱阳性染色。在其他正常组织中未检测到CacyBP/SIP。然而,在所有类型的肿瘤组织中都普遍检测到CacyBP/SIP,并且在鼻咽癌、骨肉瘤和胰腺癌中高表达。据我们所知,这是首次关于CacyBP/SIP在广泛的人类正常和肿瘤组织中表达模式的研究。所呈现的数据应为其他研究人员未来对CacyBP/SIP功能的研究提供有用的参考。希望这些知识将有助于发现CacyBP/SIP在肿瘤发生中的更多作用。