Renin, ACTH, and aldosterone during acute hypercapnia and hypoxia in conscious rats. Am J Physiol 1988 Mar;254(3 Pt 2):R431-5
Date
03/01/1988Pubmed ID
2831742DOI
10.1152/ajpregu.1988.254.3.R431Scopus ID
2-s2.0-0023921474 (requires institutional sign-in at Scopus site) 49 CitationsAbstract
The control of aldosterone secretion may be altered during acute changes in arterial blood gases. We studied the blood gas, plasma electrolyte, renin (PRA), adrenocorticotropic hormone (ACTH), and aldosterone (ALDO) responses to acute hypercapnia (4 and 8% CO2), acute hypocapnic hypoxia (10% O2), acute severe normocapnic hypoxia (7% O2-4% CO2), and acute hypercapnic hypoxia (7% O2-8% CO2) in conscious, cannulated Long-Evans rats. Normoxia resulted in normal levels of PRA (6.9 +/- 2.0 ng.ml-1.h-1), ACTH (96 +/- 32 pg/ml), and ALDO (10 +/- 3 ng/dl). Hypercapnia had no effect on PRA but did lead to an increase in ACTH (to 298 +/- 69 pg/ml) and ALDO (to 33 +/- 7 ng/dl) during 8% CO2 exposure. Normocapnic hypoxia resulted in a significant increase in ACTH (to 196 +/- 14 pg/ml) and ALDO (to 30 +/- 3 ng/dl). Hypercapnic hypoxia resulted in the greatest increases in PRA (to 30 +/- 2 ng.ml-1.h-1), ACTH (to 397 +/- 114 pg/ml), and ALDO (to 41 +/- 5 ng/dl). We conclude that in conscious rats 1) hypercapnia (less than 80 Torr) had no significant effect on PRA, 2) isocapnic, severe hypoxia (Po2 approximately 34 Torr) increased ACTH, and 3) the combination of hypercapnia and hypoxia was a very potent stimulus to PRA, ACTH, and ALDO. The ALDO responses to increases in endogenous ACTH and angiotensin II appear to be normal in conscious rats during acute hypoxia and/or hypercapnia.
Author List
Raff H, Roarty TPAuthor
Hershel Raff PhD Professor in the Academic Affairs department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Acute DiseaseAdrenocorticotropic Hormone
Aldosterone
Animals
Consciousness
Hypercapnia
Hypoxia
Male
Rats
Rats, Inbred Strains
Reference Values
Renin
