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- W2004665183 abstract "The aim was to investigate vascular receptors for atrial natriuretic factor (ANF) in spontaneously hypertensive (SHR), Wistar-Kyoto (WKY), and Wistar rats (WR) at different ages.Relaxation and guanylate cyclase responses of blood vessels to atrial natriuretic factor were investigated, as was the binding of 125I-ANF to vascular membranes and ANF receptor subtypes, using sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) in reducing conditions, after solubilisation and irreversible binding of 125I-ANF.Vascular relaxation responses of aorta showed an increased sensitivity to ANF in four week old SHR [pD2 = 8.9 (SEM 0.1) v 8.5(0.1) in WKY rats, p < 0.05] while sensitivity was similar for the three strains at older ages. Production of cyclic GMP in mesenteric arteries in response to 100 nmol.litre-1 ANF was greater (p < 0.05) in SHR than in WKY rats at four weeks of age, but was similar in older rats. The density of binding sites for ANF in mesenteric arteries, however, was lower in SHR at four weeks (p < 0.01), and increased in older rats, becoming similar to that of normotensive rats at 12 weeks of age. Affinity of ANF sites was similar in all strains. The proportion of high and low molecular weight ANF binding peptides in solubilised blood vessel membranes on SDS-PAGE was similar in all strains except in four week old SHR, in which binding to the high molecular weight band (presumably the guanylate cyclase containing receptor) was increased relative to the low molecular weight band (non-cyclase-coupled receptor) in comparison to other strains and ages.Activity of guanylate cyclase in response to occupancy of ANF receptors may be increased in young SHR. Normal relaxation of blood vessels in response to ANF in older SHR could result in failure to counteract the increased vasoconstrictor activity present in these rats, which could play a role in the increase in blood pressure." @default.
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- W2004665183 date "1992-09-01" @default.
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- W2004665183 title "Vascular atrial natriuretic factor receptors in spontaneously hypertensive rats" @default.
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- W2004665183 doi "https://doi.org/10.1093/cvr/26.9.857" @default.
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