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- W1977438683 abstract "The effects of changes in dietary intake of sodium and potassium on 125I-angiotensin II binding to platelets were studied in normal subjects. We also defined binding to platelets from patients with essential hypertension and subjects with normal blood pressure. Restriction of sodium intake in normal subjects resulted in a decrease in the number of receptor sites from 6.2 +/- 0.3 sites/cell to 4.1 +/- 0.4 sites/cell (P less than 0.01) but there were no changes in affinity as measured by the Kd. Over a range of sodium intakes from 15 to 200 mmol/day there was a negative correlation between plasma concentration of angiotensin II and receptor site concentration (rs = 0.57, P less than 0.01). Changes in dietary potassium did not affect angiotensin II binding. Angiotensin II binding was also measured in 10 patients with essential hypertension (mean blood pressure [BP] 178/107 mmHg, plasma concentrations of renin [PRC] 12 +/- 2 microU/ml and angiotensin [pANG] II 14 +/- 2 pg/ml) and 10 subjects with normal blood pressure (mean BP 112/74 mmHg, PRC 13 +/- 2 microU/ml, pANG II 13 +/- 2 pg/ml). In the hypertensive patients, binding capacity and affinity (Kd = 5.0 +/- 0.6 X 10(-10) M, 5.7 +/- 0.8 sites/cell) were similar to those in the normotensive subjects (Kd = 4.9 +/- 0.8 X 10(-10) M, 5.4 +/- 0.5 sites/cell). Changes in sensitivity to angiotensin II in essential hypertension may not be determined at receptor level. Angiotensin II receptors in platelets respond to changes in sodium intake like receptors in arterial muscle." @default.
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- W1977438683 date "1985-06-01" @default.
- W1977438683 modified "2023-10-16" @default.
- W1977438683 title "Regulation of Platelet Receptors for Angiotensin II in Man" @default.
- W1977438683 doi "https://doi.org/10.1097/00004872-198506000-00003" @default.
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