3-7-12-24-tetrahydroxycholestanoic-acid and Peroxisomal-Disorders

3-7-12-24-tetrahydroxycholestanoic-acid has been researched along with Peroxisomal-Disorders* in 1 studies

Other Studies

1 other study(ies) available for 3-7-12-24-tetrahydroxycholestanoic-acid and Peroxisomal-Disorders

ArticleYear
Sensitive analysis of serum 3alpha, 7alpha, 12alpha,24-tetrahydroxy- 5beta-cholestan-26-oic acid diastereomers using gas chromatography-mass spectrometry and its application in peroxisomal D-bifunctional protein deficiency.
    Journal of lipid research, 1998, Volume: 39, Issue:12

    The final steps in bile acid biosynthesis take place in peroxisomes and involve oxidative cleavage of the side chain of C27-5beta-cholestanoic acids leading to the formation of the primary bile acids cholic acid and chenodeoxycholic acid. The enoyl-CoA hydratase and beta-hydroxy acyl-CoA dehydrogenase reactions involved in the chain shortening of C27-5beta-cholestanoic acids are catalyzed by the recently identified peroxisomal d-bifunctional protein. Deficiencies of d-bifunctional protein lead, among others, to an accumulation of 3alpha,7alpha,12alpha, 24-tetrahydroxy-5beta-cholest-26-oic acid (varanic acid). The ability to resolve the four C24, C25 diastereomers of varanic acid has, so far, only been carried out on biliary bile acids using p -bromophenacyl derivatives. Here, we describe a sensitive gas chromatography-mass spectrometry (GC/MS) method that enables good separation of the four varanic acid diastereomers by use of 2R-butylester-trimethylsilylether derivatives. This method showed the specific accumulation of (24R,25R)-varanic acid in the serum of a patient with isolated deficiency of the d-3-hydroxy acyl-CoA dehydrogenase part of peroxisomal d-bifunctional protein, whereas this diastereomer was absent in a serum sample from a patient suffering from complete d-bifunctional protein deficiency. In samples from both patients an accumulation of (24S,25S)-varanic acid was observed, most likely due to the action of l-bifunctional protein on Delta24E-THCA-CoA. This GC/MS method is applicable to serum samples, obviating the use of bile fluid, and is a helpful tool in the subclassification of patients with peroxisomal d-bifunctional protein deficiency.

    Topics: 17-Hydroxysteroid Dehydrogenases; 3-Hydroxyacyl CoA Dehydrogenases; Cholestanols; Enoyl-CoA Hydratase; Gas Chromatography-Mass Spectrometry; Humans; Hydro-Lyases; Microbodies; Multienzyme Complexes; Peroxisomal Disorders; Peroxisomal Multifunctional Protein-2; Predictive Value of Tests; Sensitivity and Specificity; Stereoisomerism

1998