Synthetic Atrial Natriuretic Factor Induces Release (Possibly Receptor-Mediated) of Vasopressin from Rat Posterior Pituitary
- 1 February 1985
- journal article
- research article
- Published by Frontiers Media SA in Experimental Biology and Medicine
- Vol. 178 (2) , 321-325
- https://doi.org/10.3181/00379727-178-2-rc4
Abstract
The synthetic fragment (Arg 101-Tyr 126) of atrial natriuretic factor (ANF) induces release of arginine vasopressin from the isolated posterior lobe of the rat hypophysis in vitro. At a physiological concentration (3 x 10−1M) ANF was three times more effective than 61 mM KCL. In vitro binding studies with 125I-ANF revealed the presence of high affinity receptor sites displaying a pK = 9.9, a Kd = 0.14 nM, a Bmax = 20 fmol/posterior lobe and and IC50 = 200 pM. These results suggest that arginine vasopressin release by synthetic atrial natriuretic factor may be receptor mediated.Keywords
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