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Vasopressin, ACTH, and corticosteroids during hypercapnia and graded hypoxia in dogs. Am J Physiol 1983 May;244(5):E453-8

Date

05/01/1983

Pubmed ID

6303130

DOI

10.1152/ajpendo.1983.244.5.E453

Scopus ID

2-s2.0-17744404615   56 Citations

Abstract

We examined the interaction of graded hypoxia and hypercapnia on stimulation of vasopressin (AVP), ACTH, and corticosteroids in nonsurgically stressed, pentobarbital-anesthetized, gallamine-paralyzed ventilated dogs. Partial pressure of O2 in arterial blood (PaO2) levels of approximately 26-29, 38-41, 54-57, and 83-88 Torr were achieved by altering the fractional concentration of O2 in dry inspired gas with a normocapnic (PaCO2, 35 Torr) and hypercapnic (PaCO2, 59 Torr) background. Normocapnic hypoxia produced a PaO2-dependent increase in AVP, ACTH, and corticosteroids. The threshold PaO2 for AVP was lower (approximately 35 Torr) than for ACTH (approximately 45 Torr). AVP, ACTH, and corticosteroids at all PaO2 levels were higher during hypercapnia. In addition, an ACTH and corticosteroid dose-response correlation estimated the threshhold ACTH to be 20-30 pg/ml. The PaO2-dependent hormone increases and the augmentation of these relationships by hypercapnia are consistent with a peripheral chemoreceptor-mediated reflex. In addition, hypoxia and hypercapnia did not seem to alter the high sensitivity of the adrenal cortex for ACTH.

Author List

Raff H, Shinsako J, Keil LC, Dallman MF

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

Adrenal Cortex Hormones
Adrenocorticotropic Hormone
Animals
Arginine Vasopressin
Blood Pressure
Dogs
Female
Hematocrit
Hypercapnia
Hypoxia
Male
jenkins-FCD Prod-484 8aa07fc50b7f6d102f3dda2f4c7056ff84294d1d