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. 1994 Dec;113(4):1567–1573. doi: 10.1111/j.1476-5381.1994.tb17175.x

The role of nitric oxide, adrenergic activation and kinin-degradation in blood pressure homeostasis following an acute kinin-induced hypotension.

A Bjørnstad-Ostensen 1, T Berg 1
PMCID: PMC1510516  PMID: 7889314

Abstract

1. Nitric oxide (NO) has been suggested as the mediator of the vascular response to bradykinin. In the present study, we found that NO did not mediate the hypotensive response to bradykinin. In addition, the significance of kininase II in terminating a kinin-induced hypotension and the role of the adrenergic system in compensating for the acute fall in blood pressure (BP) was established. 2. In normal rats, the NO-synthase inhibitor N omega-nitro-L-arginine methyl ester (L-NAME) induced a rise in basal BP (delta BP = 40 +/- 6 mmHg, P < 0.0014) which was not altered by pretreatment with phentolamine (delta BP = 50 +/- 6 mmHg, NS). L-NAME did not attenuate the acute fall in BP in response to bradykinin (3-30 micrograms kg-1) or kallikrein (6-300 micrograms kg-1). However, a significant decrease was observed in the duration of the hypotensive response (P < 0.027). This shorter duration was not observed after pretreatment with phenotolamine in addition to L-NAME. Phentolamine alone prolonged the hypotensive response to bradykinin (P < 0.04). These experiments confirm the role of NO-formation as a hypotensive component in BP homeostasis but not the role of NO as a mediator in kinin-induced hypotension. It further shows that the continuous NO-release also impedes the compensatory adrenergic hypertensive response following the acute fall in BP induced by bradykinin. 3. The hypertensive response to intravenously administered phenylephrine was found to be unchanged by preadministration of L-NAME (NS) thus showing that L-NAME did not change the sensitivity to the adrenergic response.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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