Alterations in binding sites for atrial natriuretic factor in kidneys and adrenal glands of Dahl hypertension-sensitive rats.
Binding sites for atrial natriuretic factor (ANF) were studied in kidneys and adrenal glands of 7- and 10-week-old male Dahl hypertension-sensitive (S/JR) and hypertension-resistant (R/JR) rats by quantitative autoradiography. Binding sites for 125I-ANF-28 in kidney were highly localized and of high density in the glomeruli; binding sites were less concentrated in the renal papilla. In adrenal gland, binding sites for 125I-ANF-28 were highly concentrated in the zona glomerulosa, but were of a very low density in the inner adrenal cortex. At 7 weeks of age, the maximum binding capacity (Bmax) for 125I-ANF-28 in kidney glomeruli was increased by 21% in S/JR rats compared with R/JR rats. From 7 to 10 weeks of age, decreases in Bmax for 125I-ANF-28 in glomeruli occurred, with no apparent difference between strains. Strain or age differences in the affinity constant (Ka) for 125I-ANF did not occur in the kidney. In adrenal zona glomerulosa, the Bmax for 125I-ANF-28 binding was similar for S/JR and R/JR rats at 7 weeks of age. At 10 weeks of age, however, Bmax for 125I-ANF-28 in adrenal zona glomerulosa was increased by 19% in S/JR rats compared with age-matched R/JR controls. These findings suggest that alterations may occur in ANF binding sites in kidney and adrenal gland of S/JR rats in response to the sharp increase in blood pressure that is characteristic of rats of this strain.
Stewart
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RE
Department of Psychology, University of Virginia, Charlottesville 22903-2477.
Swithers
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SE
McCarty
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R
D000302:Adrenal Cortex / Q000378:metabolism; D000311:Adrenal Glands / Q000378:metabolism*; D000818:Animals; D009320:Atrial Natriuretic Factor / Q000378:metabolism*; D006973:Hypertension / Q000378:metabolism*; D007668:Kidney / Q000378:metabolism*; D007678:Kidney Glomerulus / Q000378:metabolism; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D017461:Receptors, Atrial Natriuretic Factor; D011956:Receptors, Cell Surface / Q000378:metabolism*
D011956:Receptors, Cell Surface; D009320:Atrial Natriuretic Factor; D017461:Receptors, Atrial Natriuretic Factor