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Human mast cells stimulate vascular tube formation. Tryptase is a novel, potent angiogenic factor.
Blair, R J; Meng, H; Marchese, M J; Ren, S; Schwartz, L B; Tonnesen, M G; Gruber, B L.
Affiliation
  • Blair RJ; Department of Medicine, SUNY at Stony Brook and Department of Veterans Affairs Medical Center, Northport, New York 11768, USA.
J Clin Invest ; 99(11): 2691-700, 1997 Jun 01.
Article in En | MEDLINE | ID: mdl-9169499
The presence of mast cells near capillary sprouting sites suggests an association between mast cells and angiogenesis. However, the role of mast cells in blood vessel development remains to be defined. In an attempt to elucidate this relationship, we investigated the effect of human mast cells (HMC-1) and their products on human dermal microvascular endothelial cell (HDMEC) tube formation. Coculture of HMC-1 with HDMEC led to a dose-response increase in the network area of vascular tube growth. Moreover, the extent of neovascularization was enhanced greatly when HMC-1 were degranulated in the presence of HDMEC. Further examination using antagonists to various mast cell products revealed a blunted response (73-88% decrease) in the area of vascular tube formation if specific inhibitors of tryptase were present. Tryptase (3 microg/ml) directly added to HDMEC caused a significant augmentation of capillary growth, which was suppressed by specific tryptase inhibitors. Tryptase also directly induced cell proliferation of HDMEC in a dose-dependent fashion (2 pM-2 nM). Our results suggest that mast cells act at sites of new vessel formation by secreting tryptase, which then functions as a potent and previously unrecognized angiogenic factor.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Endothelium, Vascular / Serine Endopeptidases / Cell Communication / Neovascularization, Physiologic / Angiogenesis Inducing Agents / Mast Cells Limits: Humans Language: En Journal: J Clin Invest Year: 1997 Document type: Article Affiliation country: United States Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Endothelium, Vascular / Serine Endopeptidases / Cell Communication / Neovascularization, Physiologic / Angiogenesis Inducing Agents / Mast Cells Limits: Humans Language: En Journal: J Clin Invest Year: 1997 Document type: Article Affiliation country: United States Country of publication: United States