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X-linked inhibitor of apoptosis: a chemoresistance factor or a hollow promise Kashkar HClin Cancer Res 2010[Sep]; 16 (18): 4496-502The X-linked inhibitor of apoptosis (XIAP) is the only cellular protein that has evolved to potently inhibit the enzymatic activity of mammalian caspases and promotes resistance to apoptosis. Given its role in apoptosis and its frequently elevated expression in malignant cells, XIAP has garnered the most attention as a promising therapeutic target in cancer to overcome drug resistance. Accordingly, XIAP is thought to render tumor cells resistant to chemotherapy through its ability to inhibit caspases, and it is on this basis that XIAP has been proposed as an important adverse biomarker for chemoresistance in cancer patients. Here, the current understanding of the role of XIAP in cancer is reviewed. Further, the notion is explored that the elevated XIAP expression frequently observed in malignant tissues is, at least, not exclusively responsible for the resistance of tumor cells to conventional therapeutic treatment; rather, the function of XIAP seems to be conducive to the process of malignant transformation and/or progression.|Animals[MESH]|Antineoplastic Agents/therapeutic use[MESH]|Cell Transformation, Neoplastic/genetics[MESH]|Drug Resistance, Neoplasm/*genetics[MESH]|Humans[MESH]|Models, Biological[MESH]|Molecular Targeted Therapy/*methods/trends[MESH]|Neoplasms/*drug therapy/genetics[MESH]|Therapies, Investigational/methods/trends[MESH]|Translational Research, Biomedical/methods/trends[MESH]|X-Linked Inhibitor of Apoptosis Protein/antagonists & inhibitors/genetics/metabolism/*physiology[MESH] |
