Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Beuers, U. et al.

Effects of tauroursodeoxycholic acid on cytosolic Ca2+ signals in isolated rat hepatocytes.

BACKGROUND: Tauroursodeoxycholic acid (TUDCA) is of potential benefit in cholestatic disorders. However, the effects of TUDCA on cytosolic free calcium [(Ca2+)i], which regulates hepatocyte secretion, are unknown. METHODS: The effect of TUDCA on (Ca2+)i was investigated in groups of isolated rat hepatocytes by microspectrofluorometry and in single cells by confocal line scanning microscopy. RESULTS: Administration of TUDCA (5-50 mumol/L) induced a nearly fourfold increase of basal levels of (Ca2+)i. After a 15 minute treatment period, the TUDCA (10 mumol/L)-induced change in (Ca2+)i was higher than that of other mono-, di-, and trihydroxy bile acids at equimolar concentrations. Pretreatment with TUDCA (10 mumol/L) markedly reduced or abolished increases in (Ca2+)i induced by phenylephrine (1 mumol/L), the microsomal Ca(2+)-translocase inhibitor 2,5-di-(tert-butyl)-1,4-benzohydroquinone (25 mumol/L), or taurolithocholic acid (10-25 mumol/L). In Ca(2+)-free medium, TUDCA caused only a reduced and transient increase in (Ca2+)i. TUDCA (10 mumol/L) induced Ca2+ oscillations in all single cells that responded. However, levels of inositol-1,4,5-trisphosphate (IP3) in hepatocytes were not increased by treatment with TUDCA (10 mumol/L). CONCLUSIONS: TUDCA at physiological concentrations potently modulates (Ca2+)i signals in hepatocytes by (1) mobilizing microsomal IP3-sensitive Ca2+ stores by an IP3-independent mechanism, (2) initiating Ca2+ oscillations, and (3) inducing influx of extracellular Ca2+.[1]

References

Effects of tauroursodeoxycholic acid on cytosolic Ca2+ signals in isolated rat hepatocytes. Beuers, U., Nathanson, M.H., Boyer, J.L. Gastroenterology (1993) [Pubmed]

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