title: Toxicity of peroxisomal C27-bile acid intermediates.
abstract: Peroxisomes play an important role in bile acid biosynthesis because the last steps of the synthesis pathway are performed by the beta-oxidation system located inside peroxisomes. As a consequence, C(27)-bile acid intermediates accumulate in several peroxisomal disorders. It has been suggested that C(27)-bile acids are especially toxic and contribute to the liver disease associated with peroxisomal disorders. For this reason, we investigated the toxicity of C(27)-bile acids and the underlying mechanisms. We studied the effects of conjugated and unconjugated C(27)-bile acids on cell viability, mitochondrial respiratory chain function and production of oxygen radicals in the rat hepatoma cell line McA-RH7777. Cell viability decreased progressively after incubation with increasing concentrations of different bile acids with dihydroxycholestanoic acid (DHCA) being clearly the most cytotoxic bile acid. In addition, the different bile acids caused a dose-dependent decrease in ATP synthesis by isolated mitochondria oxidizing malate and glutamate. Finally, there was a dose-dependent stimulation of ROS generation in the presence of C(27)-bile acids. In conclusion, our studies showed that C(27)-bile acids are more cytotoxic than mature C(24)-bile acids. In addition, C(27)-bile acids are potent inhibitors of oxidative phosphorylation and enhance mitochondrial ROS production by inhibiting the respiratory chain.
authors.affiliation: Laboratory Genetic Metabolic Diseases, Academic Medical Center at the University of Amsterdam, Amsterdam, The Netherlands. S.Ferdinandusse@amc.uva.nl
authors.forename: Sacha
authors.initials: S
authors.lastname: Ferdinandusse
authors.forename: Simone
authors.initials: S
authors.lastname: Denis
authors.forename: Georges
authors.initials: G
authors.lastname: Dacremont
authors.forename: Ronald J A
authors.initials: RJ
authors.lastname: Wanders
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D001647:Bile Acids and Salts / Q000737:chemistry / Q000378:metabolism / Q000633:toxicity*; D045744:Cell Line, Tumor; D002470:Cell Survival; D006801:Humans; D008928:Mitochondria / Q000378:metabolism; D018901:Peroxisomal Disorders / Q000378:metabolism*; D020675:Peroxisomes / Q000378:metabolism*; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D001647:Bile Acids and Salts; D017382:Reactive Oxygen Species; D000255:Adenosine Triphosphate