Cyr61/CCN1 and CTGF/CCN2 mediate the proangiogenic activity of VHL-mutant renal carcinoma cells.

Carcinogenesis
Mastan R ChintalapudiTien Hsu

Abstract

The von Hippel-Lindau (VHL) protein serves as a negative regulator of hypoxia-inducible factor (HIF)-alpha subunits. Since HIF regulates critical angiogenic factors such as vascular endothelial growth factor (VEGF) and lesions in VHL gene are present in a majority of the highly vascularized renal cell carcinoma (RCC), it is believed that deregulation of the VHL-HIF pathway is crucial for the proangiogenic activity of RCC. Although VEGF has been confirmed as a critical angiogenic factor upregulated in VHL-mutant cells, the efficacy of antiangiogenic therapy specifically targeting VEGF signaling remains modest. In this study, we developed a three-dimensional in vitro assay to evaluate the ability of RCC cells to promote cord formation by the primary human dermal microvascular endothelial cells (HDMECs). Compared with VHL wild-type cells, VHL-mutant RCC cells demonstrated a significantly increased proangiogenic activity, which correlated with increased secretion of cysteine-rich 61 (Cyr61)/cysteine-rich 61-connective tissue growth factor-nephroblastoma overexpressed (CCN) 1, connective tissue growth factor (CTGF)/CCN2 and VEGF in conditioned culture medium. Both CCN proteins are required for HDMEC cord formation as shown by RNA in...Continue Reading

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