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- W2012374310 abstract "The steroidogenic response of rat adrenal zona glomerulosa to stimulators is variable and depends on the activity of biosynthetic steps involved in the conversion of deoxycorticosterone (DOC) to aldosterone (Aldo). Corticosterone methyl oxidations (CMO) 1 and 2 are stimulated by sodium restriction and suppressed by potassium restriction. These slow alterations are accompanied by the appearance or disappearance of a specific zona glomerulosa mitochondrial protein with a molecular weight of 49,000. Induction of CMO 1 and 2 activities and the appearance of the 49 K protein can also be elicited in vitro by culture of rat zone glomerulosa cells in a medium with a high potassium concentration. The 49 K protein crossreacts with a monoclonal antibody raised against purified bovine adrenal cytochrome P-45011β. The same antibody stains a protein with a molecular weight of 51,000 in rat zona fasciculata mitochondria and in zone glomerulosa mitochondria of rats in which CMO 1 and 2 activities have been suppressed by potassium restriction and sodium loading. The 51 K crossreactive protein was purified to electrophoretic homogeneity by chromatography on octyl-sepharose. In a reconstituted enzyme system, it converted DOC to corticosterone (B) and to 18-hydroxy-11-deoxycorticosterone (18-OH-DOC) but not to 18-hydroxycorticosterone (18-OH-B) or Aldo. A partially purified 49 K protein preparation from zona glomerulosa mitochondria of rats kept on a low-sodium, high-potassium regimen converted DOC to B, 18-OH-DOC, 18-OH-B and Aldo. According to these results, rat adrenal cytochrome P-45011β exists in two different forms, with both of them capable of hydroxylating DOC in either the 11β- of the 18-position, but with only the 49 K form capable of catalyzing CMO 1 and 2. The adaptation of aldosterone biosynthesis to sodium deficiency or potassium intake in rats is due to the appearance of the 49 K form of the enzyme in zona glomerulosa mitochondria." @default.
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- W2012374310 date "1989-01-01" @default.
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- W2012374310 title "Adaptation of aldosterone biosynthesis to sodium and potassium intake in the rat" @default.
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- W2012374310 doi "https://doi.org/10.1016/0022-4731(89)90091-5" @default.
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