ISSN:
1440-1681
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Medicine
Notes:
1. Diabetes mellitus was induced by streptozotocin in male Wistar rats, and angiotensin-converting enzyme measured in plasma and mesenteric vessels 3 weeks later.2. Diabetes was associated with increased mesenteric wet weight/ bodyweight ratio (control 0.2 s.e.m. 0.02 mg/g, n= 21, vs diabetes 1.0 s.e.m. 0.3 mg/g, n= 27, P 〈 0.01, ANOVA).3. Plasma angiotensin-converting enzyme activity was increased in diabetic rats (98 s.e.m. 3 nmol HL/mL per min) compared with controls (64 s.e.m. 6 nmol HL/mL per min, P 〈 0.01, ANOVA).4. Mesenteric vessel angiotensin-converting enzyme was increased in diabetes mellitus estimated by radioligand binding site density (fmol/mg protein; 1407 s.e.m. 166 fmol/mg protein) compared with controls (890 s.e.m. 56 fmol/mg protein, P 〈 0.05, ANOVA) and by enzyme kinetic assay (diabetes, 15.5 s.e.m. 1.5 nmol HL/mg protein per min, controls, 8.3 s.e.m. 0.7 nmol HL/mg protein per min, P 〈 0.01, ANOVA). The equilibrium dissociation constant of ligand-angiotensin-converting enzyme interaction was unchanged.5. Increased vascular angiotensin-converting enzyme concentration may contribute to vascular hypertrophy and diabetic vasculopathy by increased local synthesis of angiotensin II.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1440-1681.1992.tb00468.x
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