Moreland RS, Lichtenstein AH, Chobanian AV. Effects of hypertension on hypercholesterolemia-induced changes in contraction of rabbit aorta and carotid artery.
Eur J Pharmacol 1996;
307:55-64. [PMID:
8831104 DOI:
10.1016/0014-2999(96)00232-4]
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Abstract
Reactivity of aortic and carotid strip from control; hypertensive; hypercholesterolemic; and hypertensive/hypercholesterolemic rabbits were studied. Maximal stress was less in strips from hypertensive/hypercholesterolemic animals. Norepinephrine sensitivity was increased in the carotid artery from hypertensive/hypercholesterolemic animals (EC50: 0.11 microM; 0.35 microM control). CaCl2 sensitivity during norepinephrine-induced contractions was enhanced by hypertension and hypercholesterolemia (carotid EC50: 0.10 mM; 0.38 mM control; aorta EC50: 0.12 mM; 0.82 mM control). Similar results were obtained during membrane depolarization. 5-hydroxytryptamine sensitivity (EC50: 0.15 microM carotid; 0.18 microM aorta) was decreased during hypertension (EC50: 0.51 microM carotid; 1.13 microM aorta) and by hypercholesterolemia (EC50: 1.76 microM carotid; 1.53 microM aorta). Our results support the hypothesis that hypertension and hypercholesterolemia increase vascular sensitivity by increasing Ca2+ permeability. Our results also suggest that hypertension and hypercholesterolemia selectively decrease 5-hydroxytryptamine-induced contractions.
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