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Effect of hypotension and hyperosmolality on vasopressin and ACTH responses to hypoglycemia in conscious dogs. Am J Physiol 1992 Aug;263(2 Pt 2):R382-8

Date

08/11/1992

Pubmed ID

1324617

DOI

10.1152/ajpregu.1992.263.2.R382

Scopus ID

2-s2.0-0026731725   6 Citations

Abstract

The purpose of these studies was, first, to determine whether hypertonic saline (HS) infusion or nitroprusside (NiPr)-induced hypotension augments the vasopressin (AVP) and adrenocorticotropic hormone (ACTH) responses to insulin (Ins)-induced hypoglycemia and, second, to determine whether neurohypophysectomy could attenuate the augmentation. Conscious, male dogs (n = 8) underwent two different types of experiments. In the first, Ins was preceded by either a 30-min infusion of normal saline (control) or HS to raise plasma osmolality and AVP. HS augmented the AVP response but diminished the ACTH response to Ins. In the second group of experiments, Ins was preceded by a controlled decrease in mean arterial pressure using NiPr, which led to an increase in AVP and ACTH. The initial ACTH and AVP response to Ins was augmented by NiPr, but this early augmentation was not sustained. Neurohypophysectomy attenuated the early augmentation of the ACTH response to Ins by NiPr, but did not alter the final ACTH level achieved. We conclude that HS augmented the AVP but inhibited the ACTH response to Ins probably because of expansion of plasma volume. Concomitant hypotension led to an augmentation of the early but not sustained AVP and ACTH response to Ins. Neurohypophysectomy eliminated this augmentation, suggesting a role for AVP from the neural lobe in the early ACTH response to combined hypotension and Ins-induced hypoglycemia.

Author List

Raff H, Papanek PE, Cowley AW Jr

Authors

Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of Wisconsin
Paula Papanek PhD, MPT, LAT, FACSM Associate Professor & Director of Exercise Science in the Exercise Science & Physical Therapy department at Marquette University
Hershel Raff PhD Professor in the Medicine department at Medical College of Wisconsin




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

Adrenocorticotropic Hormone
Animals
Arginine Vasopressin
Blood Glucose
Blood Pressure
Dogs
Heart Rate
Hydrocortisone
Hypoglycemia
Hypotension
Insulin
Male
Nitroprusside
Osmolar Concentration
Pituitary Gland, Posterior
Saline Solution, Hypertonic
jenkins-FCD Prod-484 8aa07fc50b7f6d102f3dda2f4c7056ff84294d1d