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Vasopressin responses to hypoxia in conscious rats: interaction with water restriction. J Endocrinol 1990 Apr;125(1):61-6

Date

04/01/1990

Pubmed ID

2338532

DOI

10.1677/joe.0.1250061

Scopus ID

2-s2.0-0025371819   12 Citations

Abstract

The purpose of this study was to determine the effect of water restriction on the vasopressin response to hypoxia in conscious Long-Evans rats. Rats were prepared with chronic indwelling femoral artery and vein catheters 1 week before experimentation. At 24 h before the first blood sample, the supply of drinking water was maintained ad libitum (water replete) or removed (water deplete). At 24 h, a control blood sample was taken and then normoxia (21% O2) was maintained or hypoxia (10% O2) induced. Additional blood samples were taken at 1, 18 and 24 h. All blood samples (2.5 ml) were simultaneously replaced with donor blood to maintain isovolaemia. Hypoxia led to a very small and transient increase in vasopressin in the water-replete rats. The combination of hypoxia and water restriction led to a greatly augmented vasopressin response at 1 h (60 +/- 16 pmol/l); this response was also not sustained. Additional non-cannulated rats were exposed to 24 h of normoxia or hypoxia with or without water available ad libitum and posterior pituitaries were collected after decapitation for measurement of vasopressin content. Water restriction, hypoxia and water restriction plus hypoxia all led to decreased pituitary vasopressin content. We conclude that the vasopressin response to hypoxia in conscious rats is small and transient, and that concomitant water restriction augments the vasopressin response to acute but not chronic hypoxia.

Author List

Griffen SC, Raff H

Author

Hershel Raff PhD Professor in the Medicine department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Hypoxia
Male
Osmolar Concentration
Pituitary Gland
Rats
Rats, Inbred Strains
Vasopressins
Water Deprivation
jenkins-FCD Prod-484 8aa07fc50b7f6d102f3dda2f4c7056ff84294d1d