ANG II-induced attenuation of duck salt gland secretion does not depend upon the release of adrenal catecholamines
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Updated: Aug 14, 2026

Evaluation of Vascular Control Mechanisms Utilizing Video Microscopy of Isolated Resistance Arteries of Rats
Published on: December 5, 2017
David Gordon Butler1, Wallace Lam, Jeff Tong
1Department of Zoology, University of Toronto, ON, Canada. dbutler@zoo.utoronto.ca
Abstract:
Pekin ducks (Anas platyrhynchos) were bilaterally adrenalectomized (ADX) using a two-stage procedure and given daily i.m. injections of 1 mg kg bw(-1) of dexamethasone (DEXA), a steroid lacking mineralocorticoid activity, and 0.9% saline drinking water ad libitum to counterbalance renal losses of salt and water. Mean arterial blood pressure (mmHg) fell from 161+/- 3.7 (intact controls) to 116 +/- 6.9 (bilateral ADX+DEXA), a decrease of 27%, but heart rates (HR) were unchanged. The nasal salt glands were fully active after ADX + DEXA. Rates of fluid secretion and electrolyte and osmolal concentrations were unchanged. Secretion stopped, then rebounded several minutes later if ADX + DEXA ducks were injected i.v. with 1 microg of [Asn(1),Val(5)]-angiotensin II (ANG II) kg bw(-1) which showed that attenuation was not adrenal catecholamine-dependent.
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