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Localization of 125I-atrial natriuretic factor (ANF)-binding sites in rat renal medulla. A light and electron microscope autoradiographic study

C Bianchi, J Gutkowska, R Garcia, G Thibault, J Genest and M Cantin

Using light and electron microscope autoradiography in vivo, the localization of 125I-(Arg 101-Tyr 126) atrial natriuretic factor (ANF)- binding sites was studied in the renal medulla of rats. At the light microscopic level, the autoradiographic reaction was mainly distributed in patches in the outer medulla, and followed the tubular architecture in the innermost part of the inner medulla. At the electron microscopic level, binding sites were mainly found in the outer medullary descending vasa recta and inner medullary collecting ducts. These results suggest that, in rats, the renal medulla may participate in the natriuresis and diuresis produced by ANF through vascular and tubular effects; the former by changing medullary blood flow at the level of descending vasa recta and the latter by acting on electrolyte and water transport at the level of collecting ducts.

Volume 35, Issue 2, pp. 149-153, 02/01/1987
Copyright © 1987 by The Histochemical Society


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