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Tauroursodeoxycholate and tauro-beta-muricholate exert cytoprotection by reducing intrahepatocyte
T Ohiwa1, K Katagiri, M Hoshino
1First Department of Internal Medicine, Nagoya City University, Medical School, Japan.
Hepatology (Baltimore, Md.)
|March 1, 1993
Summary
Tauroursodeoxycholic acid and tauro-beta-muricholic acid protect liver cells from damage caused by taurochenodeoxycholic acid. These bile acids reduce intracellular taurochenodeoxycholic acid levels, mitigating toxicity and improving cell survival.
Area of Science:
- Hepatology
- Biochemistry
- Toxicology
Background:
- Hepatotoxicity is often induced by bile acids.
- Understanding cytoprotective mechanisms is crucial for liver health.
Purpose of the Study:
- To investigate the cytoprotective effects of tauroursodeoxycholic acid (TUDCA) and tauro-beta-muricholic acid (TBMCA) against taurochenodeoxycholic acid (TCDCA)-induced liver cell toxicity.
- To determine the role of intracellular bile acid content in mediating these protective effects.
Main Methods:
- Primary cultured rat hepatocytes were used to assess cell viability and intracellular bile acid concentrations.
- Lactate dehydrogenase (LDH) release and trypan blue uptake were measured to quantify cell damage.
- Hepatocytes were treated with various bile acids, including TCDCA, TUDCA, TBMCA, taurocholic acid (TCA), and taurodehydrocholic acid (TDCA).
Main Results:
- TUDCA and TBMCA significantly reduced TCDCA-induced lactate dehydrogenase release, indicating cytoprotection.
- Intracellular TCDCA levels were halved by TUDCA and TBMCA treatment.
- Dibutyl cyclic AMP also reduced intracellular TCDCA and LDH release, suggesting a role for cAMP signaling.
- TCA showed limited reduction of intracellular TCDCA without significant cytoprotection, while TDCA had no effect.
Conclusions:
- TUDCA and TBMCA exert cytoprotective effects against TCDCA-induced hepatotoxicity.
- These protective effects are associated with a reduction in intracellular TCDCA levels.
- The hydrophilicity of bile acids plays a key role in their cytoprotective potential.