A novel secreted splice variant of vascular endothelial cell growth inhibitor

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Li-Jin ChewLu-Yuan Li

Abstract

Vascular endothelial cell growth inhibitor (VEGI), a member of the tumor necrosis factor (TNF) family, is an endothelial cell-specific inhibitor of angiogenesis. Overexpression by cancer cells of a secretable VEGI fusion protein resulted in abrogation of xenograft tumor progression, but overexpression of full-length VEGI was completely without effect. This finding indicates that secretion is essential for VEGI action. Here we report the identification of two new VEGI isoforms consisting of 251 and 192 amino acid residues. Both isoforms show endothelial cell-specific expression and share a C-terminal 151-residue segment with the previously described VEGI, which comprises 174 residues. The isoforms are generated from a 17 kb human gene by alternative splicing. Their expression is regulated in parallel by inflammatory cytokines TNF-alpha and interferon-gamma. VEGI-251, the most abundant isoform, contains a putative secretion signal. VEGI protein is detected in conditioned media of endothelial cells and VEGI-251-transfected mammalian cells. Overexpression of VEGI-251 in endothelial cells causes dose-dependent cell death. VEGI-251-transfected cancer cells form xenograft tumors of reduced growth rate and microvessel density compared ...Continue Reading

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