Vasopressinase-altered vasopressin elevates arterial pressure in anesthetized rats.

Abstract

Transient diabetes insipidus of pregnancy (TDIP) is associated with elevated activity of vasopressinase, a plasma enzyme that opens the vasopressin (AVP) ring to produce a linear peptide that we have named vasopressinase-altered vasopressin (VAV). VAV may play a role in the pathogenesis of the arterial hypertension associated with TDIP. We sought to determine if VAV elevates arterial pressure, the potency of VAV relative to that of AVP, and whether the peptide binds to the vascular AVP receptor. AVP was incubated with vasopressinase and VAV was separated from residual AVP by high-pressure liquid chromatography. Intravenous bolus administration of VAV or AVP to ganglionic blocked rats produced dose-dependent increases in arterial pressure, with VAV demonstrating approximately 6000-fold lower potency than AVP. Vasopressin receptor blockade abolished the response to both AVP and VAV. These results suggests that high levels of VAV may contribute to the hypertension seen in TDIP.

• Authors: J H Krege, J E Faber, D G Klapper, V L Katz, R E Colindres
• Journal: American journal of perinatology (Am J Perinatol) Vol. 10 Issue 2 Pg. 160-3 (Mar 1993) ISSN: 0735-1631 [Print] United States
• PMID: 8476482 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Vasopressins
• Arginine Vasopressin
• vasopressinase-altered vasopressin

Topics

• Animals
• Arginine Vasopressin (metabolism, pharmacology)
• Blood Pressure (drug effects)
• Dose-Response Relationship, Drug
• Hypertension (metabolism, physiopathology)
• Male
• Rats
• Rats, Sprague-Dawley
• Vasopressins