Key result
Spontaneously hypertensive rats show higher norepinephrine receptor affinity in resistance vessels vs controls.
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alpha-Adrenergic receptor-related properties, specifically, norepinephrine affinity, occupancy and reserve during contraction, were determined in segments of rat resistance arteries. These were obtained from the superior mesenteric bed of spontaneously hypertensive rats and Wistar-Kyoto strain controls. Receptor affinity for norepinephrine in the spontaneously hypertensive rats was significantly greater than that for the Wistar-Kyoto controls. There were no differences in the estimates of receptor occupancy and reserve. This finding taken together with other studies is consistent with the conclusion that increased alpha-adrenergic receptor-mediated sensitivity of vascular smooth muscle of the spontaneously hypertensive rat reflects differences in the agonist site on the alpha-adrenergic receptor.
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Nyborg et al. (1988) studied Hypertension (in animal models). Spontaneous hypertension (hypertensive rat model) vs. Wistar-Kyoto strain controls was evaluated on Alpha-adrenergic receptor norepinephrine affinity, occupancy, and reserve. Receptor affinity for norepinephrine was significantly greater in resistance vessels of spontaneously hypertensive rats compared to normotensive controls.
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