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Am J Physiol Regul Integr Comp Physiol 262: R707-R711, 1992;
0363-6119/92 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 262, Issue 4 707-R711, Copyright © 1992 by American Physiological Society

ARTICLES

C-type natriuretic peptides stimulate chloride secretion in the rectal gland of Squalus acanthias

R. Solomon, A. Protter, G. McEnroe, J. G. Porter and P. Silva
New England Deaconess Hospital, Boston, Massachusetts.

Homologous shark C-type natriuretic peptide (sCNP) was infused as a bolus and as a constant infusion in the isolated perfused rectal gland of the same species, Squalus acanthias. sCNP was a potent stimulator of chloride secretion similar in its dose-response curve to vasoactive intestinal peptide. sCNP was equipotent with killifish CNP but more potent than human CNP (hCNP). Truncated and substituted, forms of hCNP were also capable of stimulation of chloride secretion in the order hCNP greater than hCNP (6-22) = [Gly9]hCNP greater than hCNP-(7-21). sCNP was more potent than human atrial natriuretic peptide (hANP), which was more potent than porcine brain natriuretic peptide. hANP-(31-67) was without effect. These studies suggest that sCNP may be the physiological regulator of rectal gland function. The receptor in the rectal gland is unknown but based on the order of potencies, position 4 in the NH2-terminal end and the ring itself are important for ligand effects.


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