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Am J Physiol Regul Integr Comp Physiol 273: R1080-R1085, 1997;
0363-6119/97 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 273, Issue 3 1080-R1085, Copyright © 1997 by American Physiological Society

ARTICLES

Endogenous plasma atrial natriuretic peptide and the control of salt gland function in the Pekin duck

D. A. Gray, C. Downing and N. Sayed
Department of Physiology, University of the Witwatersrand, Johannesburg, South Africa.

Polyclonal antibodies raised in a rabbit against avian atrial natriuretic peptide (ANP) were used to investigate the role of endogenous plasma ANP in the control of salt gland function of conscious, saltwater-adapted Pekin ducks. Salt gland secretion was initiated and maintained either by a hypervolemic (290 mosmol/kg NaCl i.v. at 2 ml/min) or hyperosmotic (1,000 mosmol/kg NaCl i.v. at 0.4 ml/min) stimulus. Both experimental conditions caused significant elevations in endogenous plasma ANP concentrations. At steady states of secretion driven by hypervolemia, the administration of ANP antiserum (anti-ANP), which reduced plasma ANP concentrations by 90%, caused an immediate 30% reduction in fluid secretion rate and sodium excretion that lasted for 20-30 min. The activity of salt glands driven by hyperosmolality was not changed by anti-ANP. The results show that the high circulating concentrations of endogenous ANP associated with conditions of sustained volume expansion promote salt gland secretion.


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M. K. Heinz and D. A. Gray
Role of plasma ANG II in the excretion of acute sodium load in a bird with salt glands (Anas platyrhynchos)
Am J Physiol Regulatory Integrative Comp Physiol, July 1, 2001; 281(1): R346 - R351.
[Abstract] [Full Text] [PDF]


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