Effect of glycosylated hemoglobin on endothelium-dependent relaxation of omental arteries from pregnant women.
OBJECTIVE
This study was intended to test the hypothesis that glycosylated hemoglobin adversely affects endothelium-dependent vascular relaxation during pregnancy.


METHODS
Omental artery rings (3 mm) obtained from patients undergoing cesarean delivery at term were suspended in organ chambers for isometric tension recording in Krebs bicarbonate solution. They were bubbled with 5% carbon dioxide in air (37 degrees C, pH 7.4). After equilibration at 1-g passive tension and contraction with endothelin 1, concentration-relaxation curves in response to bradykinin were determined in the presence or absence of oxyhemoglobin, glycosylated hemoglobin, or nitric oxide synthase inhibitors (N(omega)-nitro-L-arginine methyl ester or N(omega)-nitro-L-arginine).


RESULTS
Oxyhemoglobin and glycosylated hemoglobin attenuated the endothelium-dependent relaxation induced by bradykinin. The inhibition did not differ significantly between the 2 nitric oxide scavengers and was of the same magnitude as that noted with the nitric oxide synthase inhibitors.


CONCLUSIONS
Glycosylation of hemoglobin does not change its effect on endothelium-dependent relaxation in human omental vessels during pregnancy. These data do not support the hypothesis that glycosylated hemoglobin may be the reason for abnormal endothelial function in diabetes.
Vedernikov
Y
Y
Department of Obstetrics and Gynecology, The University of Texas Medical Branch, Galveston 77555-1062, USA.
Saade
G
G
Belfort
M
M
Garfield
R E
RE
D000328:Adult; D001158:Arteries; D001794:Blood Pressure; D001920:Bradykinin / Q000494:pharmacology; D019332:Endothelin-1 / Q000494:pharmacology; D004730:Endothelium, Vascular / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D005865:Gestational Age; D006442:Glycated Hemoglobin / Q000494:pharmacology*; D020073:Gravidity; D006801:Humans; D009126:Muscle Relaxation / Q000187:drug effects*; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000502:physiology*; D009569:Nitric Oxide / Q000378:metabolism; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors; D009852:Omentum / Q000098:blood supply*; D010108:Oxyhemoglobins / Q000494:pharmacology; D011247:Pregnancy
D001920:Bradykinin; D019332:Endothelin-1; D004791:Enzyme Inhibitors; D006442:Glycated Hemoglobin; D009569:Nitric Oxide; D019001:Nitric Oxide Synthase; D010108:Oxyhemoglobins