PMID: 11922907Mar 30, 2002Paper

Expression of latent TGF-beta binding proteins and association with TGF-beta 1 and fibrillin-1 following arterial injury

Cardiovascular Research
Sanjay SinhaC M Kielty

Abstract

Transforming growth factor-beta (TGF-beta), a potent regulator of wound healing and scar formation, is thought to have a key role in the response to arterial injury. Latent TGF-beta binding proteins (LTBPs), members of the fibrillin superfamily, govern TGF-beta1 release, targeting and activation in vitro and also play a role as structural components of fibrillin-rich microfibrils. Despite the potential of LTBPs to modulate the response to arterial injury through either or both of these mechanisms, as yet their expression and function in the injured vasculature remain poorly defined. In this study, a porcine model of coronary angioplasty was used to investigate LTBP-1 and LTBP-2 synthesis and their association with TGF-beta 1 and fibrillin-1. After angioplasty, increased LTBP-1 and LTBP-2 immunostaining was detected in a similar distribution to increased TGF-beta 1 expression in the neointima and in the neoadventitia. Overnight organ cultures revealed the formation of large latent TGF-beta 1 complexes containing LTBP-1. Increased LTBP-1 proteolysis after arterial injury correlated with increased active and latent TGF-beta levels. LTBP-2 synthesis increased in response to arterial injury but was neither present in large latent co...Continue Reading

Citations

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