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

Gastroenterology. 1993 Feb;104(2):604-12. doi: 10.1016/0016-5085(93)90433-d.


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+.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Cytosol / metabolism
  • Glucose / metabolism
  • In Vitro Techniques
  • Inositol 1,4,5-Trisphosphate / metabolism
  • Liver / drug effects*
  • Liver / metabolism
  • Male
  • Rats
  • Rats, Sprague-Dawley
  • Signal Transduction / drug effects
  • Taurochenodeoxycholic Acid / pharmacology*


  • Taurochenodeoxycholic Acid
  • ursodoxicoltaurine
  • Inositol 1,4,5-Trisphosphate
  • Glucose
  • Calcium