Effects of long-term high-altitude hypoxemia on alpha 1-adrenergic receptors in the ovine uterine artery.
To elucidate the effects of chronic hypoxia on alpha 1-adrenergic receptor-mediated contractions of the uterine artery, we examined norepinephrine-induced contractions in tissues obtained from near-term (approximately 140 days gestation) pregnant ewes maintained near sea level (approximately 300 m) and at high altitude (3,820 m) from 30 days gestation. Compared with the sea-level controls, contractions induced by norepinephrine in main and fourth-branch uterine arteries of the high-altitude animals were significantly depressed. The norepinephrine dose-response curves were shifted to the right and the concentrations at which 50% of the maximal response was attained were increased 3.2- and 5.7-fold in the main and fourth-branch uterine arteries, respectively. The maximal responses were decreased 22 and 36% in main and fourth-branch uterine arteries, respectively. The dissociation constants of norepinephrine were increased from 0.77 to 1.53 microM and from 0.72 to 2.05 microM in main and fourth-branch uterine arteries, respectively. Radioligand binding studies with [3H]prazosin revealed a decrease in the density of alpha 1-adrenergic receptors in both vessels from high-altitude animals. We conclude that chronic hypoxia depresses alpha 1-adrenergic receptor-induced contractions of conduit- and resistance-type uterine arteries. The depressed contractility is mediated, at least in part, by decreases in alpha 1-adrenergic receptor density and agonist binding affinity.
Hu
X Q
XQ
Department of Pharmacology, Loma Linda University School of Medicine, California 92350, USA.
Longo
L D
LD
Gilbert
R D
RD
Zhang
L
L
D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology; D000818:Animals; D001158:Arteries / Q000502:physiology*; D005260:Female; D000860:Hypoxia / Q000503:physiopathology; D009119:Muscle Contraction / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D011224:Prazosin / Q000494:pharmacology; D011247:Pregnancy; D018340:Receptors, Adrenergic, alpha-1 / Q000502:physiology*; D012756:Sheep; D014599:Uterus / Q000098:blood supply* / Q000502:physiology
D000317:Adrenergic alpha-Antagonists; D018340:Receptors, Adrenergic, alpha-1; D009638:Norepinephrine; D011224:Prazosin