Comparative Analysis of Metastasis Variants Derived from Human Prostate Carcinoma Cells: Roles in Intravasation of VEGF-mediated Angiogenesis and UPA-mediated Invasion

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 2009 Sep 5

PMID 19729488

Citations 30

Authors

Erin M Conn

Kenneth A Botkjaer

Tatyana A Kupriyanova

Peter A Andreasen

Elena I Deryugina

James P Quigley

Affiliations

Soon will be listed here.

Abstract

To analyze the process of tumor cell intravasation, we used the human tumor-chick embryo spontaneous metastasis model to select in vivo high (PC-hi/diss) and low (PC-lo/diss) disseminating variants from the human PC-3 prostate carcinoma cell line. These variants dramatically differed in their intravasation and dissemination capacities in both chick embryo and mouse spontaneous metastasis models. Concomitant with enhanced intravasation, PC-hi/diss exhibited increased angiogenic potential in avian and murine models. PC-hi/diss angiogenesis and intravasation were dependent on increased secretion of vascular endothelial growth factor (VEGF), since treating developing tumors with a function-blocking anti-VEGF antibody simultaneously inhibited both processes without affecting primary tumor growth. PC-hi/diss cells were also more migratory and invasive, suggestive of heightened ability to escape from primary tumors due to matrix-degrading activity. Consistent with this suggestion, PC-hi/diss cells produced more of the serine protease urokinase-type plasminogen activator (uPA) as compared with PC-lo/diss. The functional role of uPA in PC-hi/diss dissemination was confirmed by inhibition of invasion, angiogenesis, and intravasation with specific function-blocking antibodies that prevented uPA activation and blocked uPA activity. These processes were similarly sensitive to aprotinin, a potent inhibitor of serine proteases, including uPA-generated plasmin. Thus, our comparison of the PC-3 intravasation variants points to key roles for the uPA-plasmin system in PC-hi/diss intravasation, possibly via (1) promoting tumor cell matrix invasion and (2) facilitating development of VEGF-dependent angiogenic blood vessels.

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