Veela B Mehta1, Gail E Besner. 1. Department of Pediatric Surgery, The Research Institute at Nationwide Children's Hospital, Center for Perinatal Research, Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, OH, USA.
Abstract
OBJECTIVE: Heparin-binding EGF-like growth factor (HB-EGF) belongs to the epidermal growth factor (EGF) superfamily of ligands. It has been implicated as a regulator of angiogenesis. However, the mechanisms by which HB-EGF promotes angiogenesis are unknown. The goal of the present study was to define the pathways by which HB-EGF stimulates angiogenesis in endothelial cells. METHODS: To characterize the angiogenic activity of HB-EGF, we treated human umbilical vein endothelial cells (HUVEC) with HB-EGF and analyzed the effects on cell proliferation, migration and tube formation. Side-by-side assays with EGF were used for comparison. RESULTS: Both HB-EGF and EGF stimulated HUVEC migration in scratch assays and promoted vascular tube formation in 2D-angiogenesis assays, without inducing cell proliferation. HB-EGF- and EGF-induced HUVEC migration and capillary tube formation were dependent upon activation of PI3K, MAPK and eNOS. Importantly, HB-EGF-and EGF-induced tube formation was comparable to, but were independent of tube formation induced by VEGF. CONCLUSIONS: We have demonstrated that HB-EGF and EGF induce angiogenesis via activation of PI3K, MAPK and eNOS in a VEGF-independent fashion. Thus, the role played by HB-EGF in stimulating physiologic processes such as wound healing in vivo may be dependent, in part, on its ability to promote angiogenesis.
OBJECTIVE:Heparin-binding EGF-like growth factor (HB-EGF) belongs to the epidermal growth factor (EGF) superfamily of ligands. It has been implicated as a regulator of angiogenesis. However, the mechanisms by which HB-EGF promotes angiogenesis are unknown. The goal of the present study was to define the pathways by which HB-EGF stimulates angiogenesis in endothelial cells. METHODS: To characterize the angiogenic activity of HB-EGF, we treated human umbilical vein endothelial cells (HUVEC) with HB-EGF and analyzed the effects on cell proliferation, migration and tube formation. Side-by-side assays with EGF were used for comparison. RESULTS: Both HB-EGF and EGF stimulated HUVEC migration in scratch assays and promoted vascular tube formation in 2D-angiogenesis assays, without inducing cell proliferation. HB-EGF- and EGF-induced HUVEC migration and capillary tube formation were dependent upon activation of PI3K, MAPK and eNOS. Importantly, HB-EGF-and EGF-induced tube formation was comparable to, but were independent of tube formation induced by VEGF. CONCLUSIONS: We have demonstrated that HB-EGF and EGF induce angiogenesis via activation of PI3K, MAPK and eNOS in a VEGF-independent fashion. Thus, the role played by HB-EGF in stimulating physiologic processes such as wound healing in vivo may be dependent, in part, on its ability to promote angiogenesis.
Authors: Gisela Weskamp; Karen Mendelson; Steve Swendeman; Sylvain Le Gall; Yan Ma; Stephen Lyman; Akinari Hinoki; Satoru Eguchi; Victor Guaiquil; Keisuke Horiuchi; Carl P Blobel Journal: Circ Res Date: 2010-01-28 Impact factor: 17.367
Authors: Andrew L Raines; Rene Olivares-Navarrete; Marco Wieland; David L Cochran; Zvi Schwartz; Barbara D Boyan Journal: Biomaterials Date: 2010-03-30 Impact factor: 12.479
Authors: Mark Katakowski; Feng Jiang; XuGuang Zheng; Jorge A Gutierrez; Alexandra Szalad; Michael Chopp Journal: Cancer Sci Date: 2009-05-18 Impact factor: 6.716