miRNA-708 control of CD44(+) prostate cancer-initiating cells

Cancer Research
Sharanjot SainiRajvir Dahiya

Abstract

Tumor recurrence in prostate cancer has been attributed to the presence of CD44-expressing tumor-initiating cells. In this study, we report that miR-708 is a key negative regulator of this CD44(+) subpopulation of prostate cancer cells, with important implications for diagnosis and prognosis of this disease. miR-708 was underexpressed in CD44(+) cells from prostate cancer xenografts. Reconstitution of miR-708 in prostate cancer cell lines or CD44(+) prostate cancer cells led to decreased tumorigenicity in vitro. Intratumoral delivery of synthetic miR-708 oligonucleotides triggered regression of established tumors in a murine xenograft model of human prostate cancer. Conversely, miR-708 silencing in a purified CD44(-) population of prostate cancer cells promoted tumor growth. Functional studies validated CD44 to be a direct target of miR-708 and also identified the serine/threonine kinase AKT2 as an additional target. Clinically, low miR-708 expression was associated significantly with poor survival outcome, tumor progression, and recurrence in patients with prostate cancer. Together, our findings suggest that reduced miR-708 expression leads to prostate cancer initiation, progression, and development by regulating the expressio...Continue Reading

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