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- W1991028900 abstract "The long-term objective is to understand the role of the adrenal ina altering systemic arterial blood pressure. This paper summarizes research on genetic hypertension in the rat and bears a relationship to several forms of human hypertension in which defects of steroid hydroxylases lead to increased secretion of mineralocorticoids other than aldosterone in genetic and experimental hypertension in rats. We demonstrated that 19-nor-corticosteroids are produced in excess in genetic and experimental hypertension in rats and man. We studied the enzymatic alteration responsible for excessive production of 19-nor-deoxycorticosterone (19-nor-DOC) in the salt-sensitive hypertensive rat S/JR. Biosynthesis of 19-nor-steroids involves hydroxylation of the C-19 methyl group. We characterized the adrenal 11μ,18,19-hydroxylase enzyme system in inbred salt-sensitive and resistant rats (R/JR). This system is capable of all three hydroxylations. The Km for 19-hydroxylation was different from S/JR and R/JR but was much greater for 11μ- and 18-hydroxylation in both. This suggested that the catalytic site for 19-hydroxylation is different from that for 11μ and 18. The S/JR adrenal enzyme binds the substrate with higher affinity than does the R/JR adrenal enzyme. We were unable to distinguish the cDNAs of the S/JR from the R/JR adrenal enzyme from bovine 11μ-hydroxylase cDNA by restriction mapping. We were unable to demonsrate restriction length polymorphism. 19-Acetylenic DOC is an inhibitor which preferentially inhibits the 19-hydroxylation of DOC, and does not interfere with the 18- and 11μ-hydroxylation. This inhibition leads to a reduction in blood pressure in the S/JR Dahl rat. We suggest that an S/JR 19-nor-DOC is involved in the development of salt-sensitivity and hypertension and that inhibition of its formation by acetylenic DOC and other aromatase and non-aromatase inhibitors is associated with reversal of these phenomena." @default.
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- W1991028900 date "1993-04-01" @default.
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- W1991028900 title "19-Nor-corticosteroids in genetic hypertension. Effects of inhibitors of 11μ,18,19-hydroxylase activity" @default.
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- W1991028900 doi "https://doi.org/10.1016/0960-0760(93)90116-e" @default.
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