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To address the possible differential functional roles assumed by different isoforms of CLU in the progression of human ovarian cancer, we constructed 2 human ovarian cancer cell models that represent examples of contradistinctive CLU expression levels. One is constitutively overexpressing different clusterin isoforms in SKOV3 cells by transfection of the 3 different expression vectors, another is silencing the intrinsically expressing clusterin in cisplatin\u2010resistant human A2780\u2010cis(CP70) tumor cells with the usage of shRNA\u2010mediated CLU gene silencing. Then, the different cellular localization, biological effects, and functional roles played in tumor progression and drug resistances were studied. We found that (<jats:italic>i<\/jats:italic>) in the distinct cellular contexts of human ovarian carcinoma SKOV3 and CP70 cells assayed, sCLU is a central molecule in cell homeostasis that functions as a cytoprotective protein, whereas nCLU is proapoptotic; (<jats:italic>ii<\/jats:italic>) In SKOV3 cells, nuclear localization of the truncated CLU is NLS dependent, without which the pnCLU protein was sequestrated in cytoplasm to prevent cytotoxicity. (<jats:italic>iii<\/jats:italic>) sCLU plays a significant role in the development of the chemoresistance phenotype in ovarian cancer cells. Moreover, with the CLU\u2010specific shRNA oligonucleotides, we successfully sensitized cells for chemotherapy, and inhibited cells' proliferation, migration and invasion. Collectively, our results reveal that, CLU gene expression might play a crucial role in ovarian cancer progression, adaptation and eventual resistance to chemotherapy through differential processing of CLU isoforms. Specifically, sCLU as an antiapoptotic protein, upregulated in an adaptive cell\u2010survival manner by chemotherapy, confers resistance to various cell\u2010death triggers. \u00a9 2009 UICC<\/jats:p>","DOI":"10.1002\/ijc.24316","type":"journal-article","created":{"date-parts":[[2009,2,3]],"date-time":"2009-02-03T14:39:31Z","timestamp":1233671971000},"page":"791-806","source":"Crossref","is-referenced-by-count":59,"title":["Roles of clusterin in progression, chemoresistance and metastasis of human ovarian 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