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. 1991 Sep;104(1):77–84. doi: 10.1111/j.1476-5381.1991.tb12388.x

Cross tachyphylaxis to endothelin isopeptide-induced hypotension: a phenomenon not seen with proendothelin.

A C Le Monnier de Gouville 1, I Cavero 1
PMCID: PMC1908272  PMID: 1786522

Abstract

1. In anaesthetized rats, an i.v. injection of endothelin-1 (0.25 nmol kg-1) evoked a rapidly appearing (maximal effect within 15 s) and short lasting (3 min) fall in blood pressure with tachyphylaxis occurring so that it was reduced by 50% by the last of 4 injections given 10 min apart. This property was also shared by endothelin-2, endothelin-3 and vasoactive intestinal contractor (VIC). 2. Cross tachyphylaxis between the isopeptides occurred. However, under the same experimental conditions the hypotensive effects of acetylcholine, adenosine, atrial natriuretic peptide (ANP) and substance P were reproducible and not modified in animals in which endothelin-1 no longer lowered blood pressure. Thus, the mechanism of the hypotensive action of endothelin peptides is different from that of acetylcholine, adenosine, ANP, and substance P. 3. In pithed rats, endothelin-1 (0.25 nmol kg-1) and its precursor human proendothelin (h-proendothelin) (0.5 nmol kg-1) induced pressor responses of a similar magnitude, which for h-proendothelin (up to 5.0 nmol kg-1) were not preceded by a hypotensive phase. The pressor effects of endothelin-1, like those of vasopressin, were reproducible upon repeated i.v. injections. 4. Rats given a 10 min infusion (0.1 nmol kg-1 min-1) of endothelin-1 showed no hypotensive response to an i.v. bolus injection of endothelin-1, whereas animals pretreated with an equipressor infusion of h-proendothelin did not develop tachyphylaxis to endothelin-1. 5. In pitched rats, endothelin-1, at a dose inducing the same maximal increase in blood pressure as h-proendothelin, was approximately 3 fold more potent as a mesenteric vasoconstrictor than h-proendothelin.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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