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• W1987745356 abstract "We have previously reported that estrogens have the potential to induce new forms of renin substrate in addition to elevating the major circulating form of this protein. One of these estrogen-induced forms had a molecular weight in excess of 150,000. In this study we have compared the plasma concentration of the high-molecular-weight renin substrate in normotensive women receiving estrogen therapy and women with estrogenic hypertension. A statistically significant elevation of this protein was associated with estrogenic hypertension and normotensive pregnant women at term. This form of renin substrate differed from the major form with respect to electrophoretic mobility, isoelectric point, and immunologic cross-reactivity. In addition, kinetic analysis indicated that this high-molecular-weight substrate has a significantly higher affinity for the enzyme renin than the major circulating form (Km = 1800 +/- 290 versus 3520 +/- 260 ng angiotensin I equivalents/ml). These results suggest that in addition to renin substrate concentration, substrate composition may play an important role in blood pressure regulation.This study investigates whether qualitative rather than quantitative differences in renin substrate were associated with estrogen induction of hypertension by comparing the plasma concentration of high molecular weight renin substrate (HMS) in 18 healthy normotensive, nonpregnant women aged 35-50 taking no medication; 20 normotensive subjects receiving estrogens as oral contraceptives (OCs) or ethinyl estradiol (EE) 50 mcg; and 5 women on OCs or EE 50 mcg who became hypertensive on estrogen therapy. A significant increase in renin substrate was evident in all women with elevated plasma estrogen levels. The difference in total renin substrate levels of normotensive and hypertensive subjects was not statistically significant. HMS differed from the normal molecular weight substrate (NMS) in electrophoretic mobility, isoelectric point, and immunologic cross-reactivity. Kinetic analysis indicated that it also had a significantly higher affinity for the enzyme renin than the major circulating form (Km=1800 +or- 290 versus 3520 +or- 260 ng angiotensin I equivalents/ml). The results suggest that substrate composition may play an important role in blood pressure regulation." @default.
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• W1987745356 date "1983-02-01" @default.
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• W1987745356 title "An increase in high-molecular weight renin substrate associated with estrogenic hypertension" @default.
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• W1987745356 doi "https://doi.org/10.1016/0006-2944(83)90049-2" @default.
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