PMID: 6165641Jul 1, 1981Paper

Studies of relationship among bile-acid uptake, Na+, K+-ATPase, and Na+ gradient in isolated cells from rat ileum

Gastroenterology
F A Wilson, L L Treanor

Abstract

Studies were performed to determine relationships among Na+, K+-ATPase, the transmucosal Na+ gradient, and bile-acid transport in metabolically viable cells isolated from rat ileum. Incubation of cells with 0, 10(-6), 10(-5), 10(-4) and 10(-3) M ouabain resulted, respectively, in a 0, 10.3, 42.1, 97.0, and 100% decrease in glycocholate uptake and a 0, 10.7, 46.4, 76.8, and 100% decrease in Na+, K+-ATPase activity. Thus, one-half maximal inhibition of glycocholate uptake and Na+, K+-ATPase activity occurred at 5.5 x 10(-5) M and 1.7 x 10(-5) M ouabain, respectively. A change in glycocholate uptake was correlated with a change in Na+, K+-ATPase activity after daily injections of methylprednisolone. After 4 days treated animals showed a 26% and 36% increase in glycocholate uptake and Na+, K+-ATPase activity, respectively, over pair-fed saline-treated controls (p less than 0.001). Methylprednisolone did not significantly alter the activity of (Mg++)-ATPase when compared with controls (p greater than 0.05). Glycocholate uptake was reduced by the omission of Na+ from the incubation medium. Preincubation of cells at 37 degrees C with gramicidin D, 10 micrograms/ml, to alter membrane permeability to Na+, resulted in a significant rise ...Continue Reading

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