Decreased Expression of Heat Shock Protein 20 in Colorectal Cancer and Its Implication in Tumorigenesis

作者：Ju Young Tae; Kwag Seung Jin; Park Hee Jin; Jung Eun Jung; Jeong Chi Young; Jeong Sang Ho; Lee Young Joon; Choi Sang Kyung; Kang Kee Ryeon; Hah Young Sool^*; Hong Soon Chan

来源：Journal of Cellular Biochemistry, 2015, 116(2): 277-286.

DOI：10.1002/jcb.24966

• APOPTOSIS
• COLORECTAL CANCER
• HEAT-SHOCK PROTEIN 20
• TUMOR MARKER

Heat shock protein 20 (HSP20), which is a member of the small heat shock protein family, is known to participate in many pathological processes, such as asthma, intimal hyperplasia, and insulin resistance. However, the function of HSP20 in cancer development is not yet fully understood. In this study, we identified HSP20 as a down-regulated protein in 20 resected colorectal cancer (CRC) specimens compared with their paired normal tissues. Because HSP20 proteins were barely detectable in HCT-116 cells (a human colorectal cancer cell line), recombinant adenovirus encoding HSP20 (Ad-HSP20) was used to induce HSP20 overexpression in HCT-116 cells. Infection of Ad-HSP20, but not control adenovirus (Ad-GFP), reduced viability, and induced massive apoptosis in a time-dependent manner. The forced expression of HSP20 enhanced caspase-3/7 activity and down-regulated the anti-apoptotic Bcl-xL and Bcl-2 mRNA and protein levels. In addition, immunohistochemical analysis of 94 CRC specimens for HSP20 protein showed that reduced HSP20 expression was related to advanced TNM stage, lymph node metastasis, and tumor recurrence. Our study shows, for the first time, that expression of the HSP20 protein has a pro-death role in colorectal cancer cells. Therefore, HSP20 may have value as a prognostic tumor marker and its overexpression might be a novel strategy for CRC therapy.

• 出版日期2015-2