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. 1992 Jan;105(1):202–210. doi: 10.1111/j.1476-5381.1992.tb14235.x

Involvement of capsaicin-sensitive neurones in the haemodynamic effects of exogenous vasoactive peptides: studies in conscious, adult Long Evans rats treated neonatally with capsaicin.

H Bachelard 1, S M Gardiner 1, P A Kemp 1, T Bennett 1
PMCID: PMC1908627  PMID: 1375856

Abstract

1. The regional haemodynamic effects of i.v. bolus injections of bradykinin (0.05 or 0.5 nmol), cholecystokinin (0.175 or 1.75 nmol), substance P (0.01 or 0.1 nmol) and calcitonin gene-related peptide (0.05 or 0.5 nmol) were assessed in conscious, adult Long Evans rats that had been treated neonatally with either capsaicin (50 mg kg-1, s.c.) or vehicle. 2. In vehicle-treated rats, both doses of bradykinin were without effect on blood pressure, but caused tachycardia and hindquarters vasodilatation. Moreover, after the higher dose there were dilatations in the renal and superior mesenteric vascular beds. In capsaicin-treated rats the hindquarters vasodilator effects elicited by both doses of bradykinin were significantly reduced, while the tachycardia and responses in the renal and superior mesenteric vascular beds were unchanged. 3. In vehicle-treated rats, cholecystokinin caused dose-dependent increases in blood pressure accompanied by renal, superior mesenteric and hindquarters vasoconstriction followed, after the higher dose, by a hindquarters vasodilatation. The lower dose produced a tachycardia, while there was a bradycardia followed by a tachycardia after the higher dose. In capsaicin-treated rats, the pressor response, as well as the renal vasoconstrictor effects of cholecystokinin, were greater than in vehicle-treated rats, while the heart rate, superior mesenteric or hindquarters responses were not different. 4. In vehicle-treated rats, substance P produced a dose-dependent depressor response and tachycardia accompanied by dilatations in the renal and hindquarters vascular beds and constriction in the superior mesenteric vascular bed.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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