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Centrosomal PKCβII and Pericentrin Are Critical for Human Prostate Cancer Growth and Angiogenesis

Departments of ¹ Chemical and Systems Biology and ² Urology, Stanford University, School of Medicine, Stanford, California; ³ Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; ⁴ Department of Molecular and Biochemical Nutrition and Metabolism, University of California, Berkeley, California; and ⁵ Department of Medicine, University of California, San Francisco, California

Requests for reprints: Daria Mochly-Rosen, Department of Chemical and Systems Biology, Stanford University, School of Medicine, Stanford, CA 94305-5174. Phone: 650-725-7720; Fax: 650-723-4686; E-mail: mochly{at}stanford.edu.

Key Words: prostate cancer • angiogenesis • protein kinase C • cell proliferation and pericentrin

Angiogenesis is critical in the progression of prostate cancer. However, the interplay between the proliferation kinetics of tumor endothelial cells (angiogenesis) and tumor cells has not been investigated. Also, protein kinase C (PKC) regulates various aspects of tumor cell growth, but its role in prostate cancer has not been investigated in detail. Here, we found that the proliferation rates of endothelial and tumor cells oscillate asynchronously during the growth of human prostate cancer xenografts. Furthermore, our analyses suggest that PKCβII was activated during increased angiogenesis and that PKCβII plays a key role in the proliferation of endothelial cells and tumor cells in human prostate cancer; treatment with a PKCβII-selective inhibitor, βIIV5-3, reduced angiogenesis and tumor cell proliferation. We also find a unique effect of PKCβII inhibition on normalizing pericentrin (a protein regulating cytokinesis), especially in endothelial cells as well as in tumor cells. PKCβII inhibition reduced the level and mislocalization of pericentrin and normalized microtubule organization in the tumor endothelial cells. Although pericentrin has been known to be up-regulated in epithelial cells of prostate cancers, its level in tumor endothelium has not been studied in detail. We found that pericentrin is up-regulated in human tumor endothelium compared with endothelium adjacent to normal glands in tissues from prostate cancer patients. Our results suggest that a PKCβII inhibitor such as βIIV5-3 may be used to reduce prostate cancer growth by targeting both angiogenesis and tumor cell growth. [Cancer Res 2008;68(16):6831–9]

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				Correction: KC{beta}II and Pericentrin Are Critical in Prostate Cancer Cancer Res., September 15, 2008; 68(18): 7692 - 7692. [Full Text] [PDF]