Research article

Vasohibin inhibits angiogenic sprouting in vitro and supports vascular maturation processes in vivo

Johann Kern¹ , Michael Steurer² , Günther Gastl¹ , Eberhard Gunsilius^{* 1} and Gerold Untergasser^{* 1}

¹Division of Internal Medicine V, Tumor Biology & Angiogenesis Laboratory, Medical University Innsbruck, Innrain 66, A-6020 Innsbruck, Austria

²Division of Internal Medicine V, Laboratory for Molecular Genetics, Medical University Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria

author email corresponding author email* Contributed equally

BMC Cancer 2009, 9:284doi:10.1186/1471-2407-9-284

Published:	17 August 2009

Abstract

Background

The murine homologue of human vasohibin (mVASH1), a putative antiangiogenic protein, was investigated for its effects on in vitro and in vivo angiogenesis.

Methods

Cell growth and migration were analyzed in murine fibroblasts, smooth muscle cells and endothelial cells. Angiogenic sprouting was studied in human umbilical vein endothelial cells (HUVECs) in the spheroid sprouting assay. In vivo effects on blood vessel formation were investigated in the chorioallantoic membrane (CAM) assay and in the C57BL/6 melanoma xenograft model.

Results

Purified murine and human VASH1 protein induced apoptosis of murine fibroblasts in vitro, but not of vascular aortic smooth muscle cells (AoSMC) or endothelial cells. Adenoviral overexpression of murine and human VASH1 inhibited capillary sprouting of HUVECs in the spheroid assay. Administration of recombinant murine and human VASH1 inhibited growth of large vessels in the CAM assay and promoted the formation of a dense, fine vascular network. Murine VASH1-overexpressing B16F10 melanomas displayed a reduction in large vessels and vascular area. Moreover, tumors showed more microvessels that stained positive for the mural cell markers α-smooth muscle cell actin (ASMA) and proteoglycan (NG2).

Conclusion

Our data imply that murine VASH1 causes angiogenic remodelling by inhibiting angiogenic sprouting and large vessel growth, thereby supporting the formation of a vascular bed consisting predominantly of mature microvessels.