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. 1991 Aug;103(4):2009–2015. doi: 10.1111/j.1476-5381.1991.tb12368.x

The effects of phosphoramidon on the regional haemodynamic responses to human proendothelin [1-38] in conscious rats.

S M Gardiner 1, A M Compton 1, P A Kemp 1, T Bennett 1
PMCID: PMC1908215  PMID: 1912989

Abstract

1. Cardiovascular responses to human proendothelin [1-38], in the absence and presence of phosphoramidon, were studied in conscious Long Evans rats, chronically instrumented for the continuous recording of heart rate, systemic arterial blood pressure and renal, mesenteric and hindquarters blood flows. 2. A dose of 0.1 nmol kg-1 human proendothelin [1-38] caused a slight pressor effect (maximum 5 +/- 2 mmHg), but a clear bradycardia (maximum -29 +/- 7 beats min-1). Renal haemodynamics were unchanged but there was mesenteric vasoconstriction and a vasodilation followed by a vasoconstriction in the hindquarters. 3. A dose of 1.0 nmol kg-1 human proendothelin [1-38] caused a gradual hypertension (maximum 42 +/- 4 mmHg at 10 min) and a profound bradycardia (-149 +/- 10 beats min-1 at 30 min). There were gradual but marked, renal and hindquarters vasoconstrictions, whereas there was a substantial mesenteric vasoconstriction that was relatively rapid in onset. 4. In 2 animals, administration of human proendothelin [1-38] at a dose of 10 nmol kg-1 caused an initial hypotension followed by a rapidly-developing pressor effect; there were renal and mesenteric vasoconstrictions and vasodilatation followed by vasoconstriction in the hindquarters. These changes were very similar to those seen following injection of endothelin-1 (0.1 nmol kg-1). 5. Phosphoramidon (2 mumol kg-1) had no cardiovascular effects itself and it did not affect significantly the pressor or mesenteric vasoconstrictor effects of human proendothelin [1-38], but it reduced the bradycardia and renal and hindquarters vasoconstrictor responses.(ABSTRACT TRUNCATED AT 250 WORDS)

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2009

Selected References

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