Angiotensin converting enzyme inhibition reduces the expression of transforming growth factor-beta1 and type IV collagen in diabetic vasculopathy.

Abstract:

OBJECTIVE:The purpose of this study was to assess the role of transforming growth factor (TGF)-beta1 in the development of diabetes-associated mesenteric vascular hypertrophy and in the antitrophic effect of angiotensin converting enzyme inhibitors. DESIGN AND METHODS:Streptozotocin-induced diabetic and control Sprague-Dawley rats were randomly allocated to treatment with the angiotensin converting enzyme inhibitor ramipril or to no treatment and were killed 1 or 3 weeks after the streptozotocin injection. Blood was collected and mesenteric vessels removed. Mesenteric vascular weight was measured and TGF-beta1 and alpha1 (type IV) collagen messenger (m)RNA levels were analysed by Northern analysis. Immunohistochemical analyses for TGF-beta1 and type IV collagen were also performed. RESULTS:The diabetic rats had increased mesenteric vessel weight at 3 weeks but not at 1 week and a concomitant rise in mesenteric TGF-beta1 and in alpha1 (type IV) collagen mRNA levels. Ramipril treatment attenuated mesenteric vessel hypertrophy and prevented the increase in TGF-beta1 and alpha1 (type IV) collagen mRNA levels after 3 weeks of diabetes. The immunohistochemical analysis revealed that diabetes was associated with increased TGF-beta1 and type IV collagen protein and extracellular matrix accumulation in mesenteric vessels, and this increase was reduced by ramipril treatment. CONCLUSIONS:These results support the concept that TGF-beta is involved in the changes associated with diabetic vascular disease, and suggest a mechanism by which angiotensin converting enzyme inhibitors exert their antitrophic effects.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Rumble JR,Gilbert RE,Cox A,Wu L,Cooper ME

doi

10.1097/00004872-199816110-00006

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

1603-9

issue

11

eissn

0263-6352

issn

1473-5598

journal_volume

16

pub_type

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