[Angiotensin-converting enzyme gene and the brachial artery endothelial dysfunction in type 2 diabetes without angiopathy].
OBJECTIVE
To investigate the relationship between angiotensin converting enzyme (ACE) gene and endothelial dysfunction.


METHODS
One hundred and ten type 2 diabetic patients without angiopathy were selected randomly, and PCR technique was used to determine their ACE genotypes. High resolution ultrasonography was performed to measure the changes in brachial artery diameter at rest, after reactive hyperemia (with increased flow producing an endothelium-dependent dilation) and after sublingual glyceryltrinitrate (GNT, an endothelium-independent dilator). Meanwhile, 50 healthy individuals were selected randomly as controls.


RESULTS
In type 2 diabetes mellitus and control groups, the percentages for flow-mediated arterial dilation in patients with DD genotypes were 3.38% and 3.67% respectively, which were significantly lower than those in patients with II genotypes (4.12% and 4.68% respectively, P<0.05). The baseline blood vessel size, baseline blood flow and GNT induced dilation in both groups showed no significant differences among ACE genotypes (P>0.05). By multiple stepwise regression analysis, reduced flow-mediated arterial dilation was associated with age, baseline vessel size, low density lipoprotein cholesterol(LDL-C), Lp(a), D allele, fasting blood glucose (FBG), postparandial blood glucose (PPBG), HbA1c, duration of diabetes in type 2 diabetic patients (P<0.0005).


CONCLUSIONS
ACE DD genotype is related to endothelium-dependent arterial dilation in the early stage of type 2 diabetes mellitus and in healthy individuals.
Xiang
Guang-da
GD
Department of Endocrinology, Guangzhou Army Wuhan General Hospital, Wuhan, Hubei, 430070 PR China. Guangda64@163.net
He
Yu-sheng
YS
Dai
Xiao-jing
XJ
Wang
Yun-lin
YL
Wu
Yu-hua
YH
D000328:Adult; D000368:Aged; D001916:Brachial Artery / Q000503:physiopathology*; D003924:Diabetes Mellitus, Type 2 / Q000201:enzymology / Q000235:genetics* / Q000503:physiopathology; D003925:Diabetic Angiopathies / Q000235:genetics / Q000503:physiopathology; D004730:Endothelium, Vascular / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D007703:Peptidyl-Dipeptidase A / Q000235:genetics*; D016133:Polymerase Chain Reaction
D007703:Peptidyl-Dipeptidase A