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- W2286684612 abstract "Lithocholic acid (LCA) and its sulfate (LCS) and glucuronide (LCG) derivatives are potent cholestatic agents. During the course of LCG-induced cholestasis in rats, calcium (Ca) salts of LCG precipitate in bile. To characterize the affinity of bile salts for Ca, solutions of selected bile salts were titrated with Ca. Apparent equilibrium constants (KcaBS) were determined from the unbound Ca ion concentrations that were measured spectrophotometrically with metallochromic indicators antipyrylazo III or murexide or with a Ca-selective electrode. KCaBS values were 1.12 +/- 0.04 X 10(-4) M for LCS, 2.88 +/- 0.26 X 10(-4) M for LCG, 3.09 +/- 0.21 X 10(-4) M for LCA, 1.93 +/- 0.07 X 10(-3) M for taurocholic acid (TC), 2.69 +/- 0.08 X 10(-3) M for glycocholic acid (GC), and 6.07 +/- 0.27 X 10(-3) M for taurolithocholic acid sulfate (TLCS). The KCaBS for LCG measured by a Ca-selective electrode under identical conditions was 5.53 +/- 2.75 X 10(-4) M. Comparing relative cholestatic potential with affinity for Ca, cholestatic bile salts LCS, LCG, and LCA bind Ca 10-60 times more avidly than TC, GC, and TLCS. At the unbound Ca ion concentrations of serum or bile (approx 1 mM), only LCS, LCG, and LCA would be expected to bind significant amounts of Ca." @default.
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- W2286684612 date "1984-07-01" @default.
- W2286684612 modified "2023-09-26" @default.
- W2286684612 title "Calcium binding by lithocholic acid derivatives" @default.
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- W2286684612 doi "https://doi.org/10.1152/ajpgi.1984.247.1.g112" @default.
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