Lack of correlation between [3H]ouabain binding and Na-K ATPase inhibition in rat aorta

European Journal of Pharmacology
R C DethR Walsh


The binding of [3H]ouabain to intact strips of rat aorta was compared with the ability of ouabain to inhibit the uptake of 86Rb by the same preparation. When a cold temperature wash was used to process tissues after binding of [3H]ouabain, a class of relatively high affinity binding sites was found (KD = 1.2 X 10(-7) M). Binding was saturable and sensitive to both ATP depletion and elevated potassium. Elevation of cytoplasmic Ca2+ levels by phenylephrine or c-AMP levels by theophylline and terbutaline had no influence on [3H]ouabain binding. Ouabain inhibition of 86Rb uptake progressed to 60% of the total 86Rb uptake at 2 X 10(-3) from a threshold of about 10(-5) M. Half-maximal inhibition by ouabain occurred at a concentration of 10(-4) M. The disparity between [3H]ouabain binding and inhibition of 86Rb uptake indicates that the high affinity binding site in the rat does not contribute to inhibition of Na-K ATPase function.


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Nov 1, 1980·Circulation Research·N V Wellsmith, G E Lindenmayer

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Oct 1, 1990·Biulleten' eksperimental'noĭ biologii i meditsiny·Z Sh SamagulovaE L Zumerov
Jan 1, 1990·Life Sciences·R M RapoportK C Chang
Dec 30, 1986·Biochemical and Biophysical Research Communications·M D CampbellR C Deth

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