Atrial natriuretic peptide binding in rat placenta, yolk sac, decidua, and maternal placental vessels.
Using in vitro autoradiography, binding sites of 125I-ANP (atrial natriuretic peptide) were localized in the rat placenta, visceral yolk sac, and decidua at 16, 18, and 20 days of gestation. There was diffuse binding over the labyrinthine region of the placenta and an intense binding over the decidual gland and visceral yolk sac. In the yolk sac, ANP localized over the cores of the villi where it may be involved with the regulation of transport across the membranes or the flow of blood through the vitelline vessels. Of particular interest was binding over the maternal blood vessels supplying the decidual region and placenta. Receptors were located on the endothelial cells and smooth muscle cells of the arteries and veins, indicating that ANP may be involved with regional regulation of blood flow to the placenta.
Department of Anatomy, School of Medicine, Wright State University, Dayton, OH 45345.
J N
JN
Scott
D000818:Animals; D009320:Atrial Natriuretic Factor / Q000378:metabolism*; D001665:Binding Sites; D003656:Decidua / Q000378:metabolism; D005260:Female; D005865:Gestational Age; D010920:Placenta / Q000098:blood supply / Q000378:metabolism*; D011247:Pregnancy; D051381:Rats; D017461:Receptors, Atrial Natriuretic Factor / Q000378:metabolism; D015017:Yolk Sac / Q000378:metabolism
D009320:Atrial Natriuretic Factor; D017461:Receptors, Atrial Natriuretic Factor