By James A. Schafer (auth.), Saulo Klahr M. D., Shaul G. Massry M. D. (eds.)
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Additional resources for Contemporary Nephrology: Volume 2
24 JAMES A. SCHAFER In this case, the transepithelial voltage would be zero. This may account for the wide variation in transepithelial voltages that are observed in isolated cortical collecting tubules from rabbits on a standard diet. 62 - 64 It is obvious that the relative rate or K + secretion compared to Na + absorption should Auctuate depending on the requirements for excretion of the two ions. If the apical membrane permeability is a determinant of the net transport or either 01' both ions, one might expect that transepithelial voltages could vary widely depending on whether the luminal membrane conductance were dominated by Na + 01' K +.
K + and Cl- across the luminal membrane. tant vohage \\'iJl depend upon the relative penneabilities of these ions in the luminal membrane. As such. the luminal membrane voltage can be regarded as a "compromise" among the ]\:ernst potentials for the various ions. The voltage ac ross the memhrane mav even be orientcd with the llIu('(Jsa relativel\' negati,'e to the cell. if the conductance of the luminal membrane is dominated by a high permeability for ]\: a + . In association with each membrane, Fig.
Thev found that the kidnevs of adrenalcclOmized rats had reduced enZ\'llle It'vds wIreIl (0111, , pared lO normal controls. ,16(; administration of high-dose aldosterone, DOCA 01' the glucocorticoid triamcinolone, f()]- 5 days prior to remo\'al of the kidnevs of the adrenalectomized animals resulted in restoration of enzyme I~\'els to normal. 'h'o cation excretion had become evident. Full restoration of enzyme acti\,ity could not be achie\'ed e\'en after 44 hr of treatment. 167 , , 30 JAMES A. SCHAFER Corticosterone administered at physiologic doses had no effect on Na,KA TPase activity within the first 24 hr but restored normal enzyme activity after 48 to 64 hr.