Document Detail


Comparison of the effects of bile acids on cell viability and DNA synthesis by rat hepatocytes in primary culture.
MedLine Citation:
PMID:  10657584     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Bile acid-induced inhibition of DNA synthesis by the regenerating rat liver in the absence of other manifestation of impairment in liver cell viability has been reported. Because in experiments carried out on in vivo models bile acids are rapidly taken up and secreted into bile, it is difficult to establish steady concentrations to which the hepatocytes are exposed. Thus, in this work, a dose-response study was carried out to investigate the in vitro cytotoxic effect of major unconjugated and tauro- (T) or glyco- (G) conjugated bile acids and to compare this as regards their ability to inhibit DNA synthesis. Viability of hepatocytes in primary culture was measured by Neutral red uptake and formazan formation after 6 h exposure of cells to bile acids. The rate of DNA synthesis was determined by radiolabeled thymidine incorporation into DNA. Incubation of hepatocytes with different bile acid species - cholic acid (CA), deoxycholic acid (DCA), chenodeoxycholic acid (CDCA) and ursodeoxycholic acid (UDCA), in the range of 10-1000 microM - revealed that toxicity was stronger for the unconjugated forms of CDCA and DCA than for CA and UDCA. Conjugation markedly reduced the effects of bile acids on cell viability. By contrast, the ability to inhibit radiolabeled thymidine incorporation into DNA was only slightly lower for taurodeoxycholic acid (TDCA) and glycodeoxycholic acid (GDCA) than for DCA. When the effect of these bile acids on DNA synthesis and cell viability was compared, a clear dissociation was observed. Radiolabeled thymidine incorporation into DNA was significantly decreased (-50%) at TDCA concentrations at which cell viability was not affected. Lack of a cause-effect relationship between both processes was further supported by the fact that well-known hepatoprotective compounds, such as tauroursodeoxycholic acid (TUDCA) and S-adenosylmethionine (SAMe) failed to prevent the effect of bile acids on DNA synthesis. In summary, our results indicate that bile acid-induced reduction of DNA synthesis does not require previous decreases in hepatocyte viability. This suggests the existence of a high sensitivity to bile acids of cellular mechanisms that may affect the rate of DNA repair and/or proliferation, which is of particular interest regarding the role of bile acids in the etiology of certain types of cancer.
Authors:
M C Martinez-Diez; M A Serrano; M J Monte; J J Marin
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  1500     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-06-26     Completed Date:  2000-06-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  153-60     Citation Subset:  IM    
Affiliation:
Department of Physiology and Pharmacology, Faculty of Pharmacy, University of Salamanca, 37007-, Salamanca, Spain.
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MeSH Terms
Descriptor/Qualifier:
Animals
Bile Acids and Salts / pharmacology*,  toxicity
Cell Division / drug effects
Cell Survival / drug effects
Cells, Cultured
Chenodeoxycholic Acid / pharmacology,  toxicity
Cholic Acid / pharmacology,  toxicity
Coloring Agents
DNA Replication / drug effects*
Deoxycholic Acid / pharmacology,  toxicity
Dose-Response Relationship, Drug
Formazans
Glycodeoxycholic Acid / pharmacology,  toxicity
Growth Inhibitors / pharmacology*,  toxicity
Liver / cytology,  drug effects*
Male
Neutral Red
Nucleic Acid Synthesis Inhibitors / pharmacology*,  toxicity
Rats
Rats, Wistar
Taurodeoxycholic Acid / pharmacology,  toxicity
Ursodeoxycholic Acid / pharmacology,  toxicity
Chemical
Reg. No./Substance:
0/Bile Acids and Salts; 0/Coloring Agents; 0/Formazans; 0/Growth Inhibitors; 0/Nucleic Acid Synthesis Inhibitors; 128-13-2/Ursodeoxycholic Acid; 360-65-6/Glycodeoxycholic Acid; 474-25-9/Chenodeoxycholic Acid; 516-50-7/Taurodeoxycholic Acid; 553-24-2/Neutral Red; 81-25-4/Cholic Acid; 83-44-3/Deoxycholic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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