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- W2093669719 abstract "Na+-K+-ATPase activity and [3H]ouabain binding were studied in cerebral cortex, kidney and heart isolated from spontaneously hypertensive rats (SHR) in both the prehypertensive (6 week old) and the hypertensive stages (14 week old). Na+-K+-ATPase activity of heart and kidney was found to be decreased by about 38 and 16% in the prehypertensive and hypertensive stages of SHR respectively; that of cerebral cortex decreased by 23.5% only in the hypertensive stages. Similar results were obtained by pretreatment of membranes with either 0.001% Triton X-100 or by increasing the K concentration from 4.7 to 12.7 mM in the Krebs solution. No significant differences in microsomal protein yield were noted between prehypertensive or hypertensive SHR and the age-matched WKY rats. The study of binding of [3H]ouabain to cerebral cortex, kidney and heart showed that the decreased Na+-K+-ATPase in hypertensive SHR was due to a 31.6, 21.8 and 41.3% reduction in the number of high affinity binding sites respectively, while the affinity constants (Kd) of ouabain binding sites on this enzyme in cerebral cortex, kidney and heart of the normotensive WKY rats were 26.5, 455.9 and 74.7 nM respectively and those from the hypertensive SHR were not altered. The plasma K concentration of the SHR in the prehypertensive and hypertensive stages was 4.07 and 4.13 mM, respectively, significantly less than that of the age-matched WKY rats. It appears that the decrease of plasma K and Na+-K+-ATPase activity in heart and kidney in SHR is derived from a genetic defect and may be related to the abnormal Na handling in this genetically hypertensive strain." @default.
- W2093669719 created "2016-06-24" @default.
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- W2093669719 date "1986-04-01" @default.
- W2093669719 modified "2023-10-14" @default.
- W2093669719 title "Decreased NA+-K+-ATPase activity and [3H]ouabain binding sites in various tissues of spontaneously hypertensive rats" @default.
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- W2093669719 doi "https://doi.org/10.1016/0014-2999(86)90411-5" @default.
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