Key result
In mice, alpha2-AR-mediated vasoconstriction induced by catecholamines is attributable to the alpha2A-AR subtype, as alpha2A-AR knockouts responded to norepinephrine with a 20-mm Hg fall in BP (p<0.001 vs wild-type).
Why the study?
Does norepinephrine bolus alter blood pressure responses in genetically engineered mice deficient for alpha2-adrenergic receptor subtypes compared to wild-type mice?
Population
Genetically engineered mice deficient for the gene to each alpha2-adrenergic receptor subtype and their…
Comparison
Bolus of norepinephrine before and after… vs Wild-type counterparts
Design
Preclinical
Authors
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Alpha2A-AR may be a viable target for modulating vasoconstriction; extends preclinical subtype mapping but leaves open human studies.
Does norepinephrine bolus alter blood pressure responses in genetically engineered mice deficient for alpha2-adrenergic receptor subtypes compared to wild-type mice?
p-value: p=<0.001
The alpha2A-adrenergic receptor subtype is primarily responsible for alpha2-mediated vasoconstriction induced by catecholamines, although alpha1-receptors account for up to 68% of the overall vasoconstrictive response.
Duka et al. (2000) studied this question. Norepinephrine bolus before and after sequential blockade with prazosin and yohimbine vs. Wild-type counterparts was evaluated on Blood pressure response to norepinephrine bolus after alpha1-AR blockade (p=<0.001). In mice, alpha2-AR-mediated vasoconstriction induced by catecholamines is attributable to the alpha2A-AR subtype, as alpha2A-AR knockouts responded to norepinephrine with a 20-mm Hg fall in BP (p<0.001 vs wild-type).
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