Variability of human hepatic UDP-glucuronosyltransferase activity

• Autorzy: Little J. M. , Lester R. , Kuipers F. , Vonk R. , Mackenzie P.I. , Drake R.R. , Frame L. , Radominska-Pandya A.
• Języki publikacji: EN

Abstrakty

EN

The availability of a unique series of liver samples from human subjects, both control patients (9) and those with liver disease (6; biliary atresia (2), retransplant, chronic tyrosinemia type I, tyrosinemia, Wilson's disease) allowed us to characterize human hepatic UDP-glucuronosyltransferases using photoaffinity labeling, immunoblotting and enzymatic assays. There was wide inter-individual variation in photoincorporation of the photoaffinity analogs, [32]5-azido-UDP-glucuronic acid and [32]5-azido-UDP-glucose and enzymatic glucuronidation of substrates specific to the two subfamilies of UDP-glucuronosyltransferases. However, the largest differences were between subjects with liver disease. Glucuronidation activities toward one substrate from each of the UDP-glucuronosyltransferases subfamilies, 1A and 2B, for control and liver disease, respectively, were 1.7-4.5 vs 0.4-4.7 nmol/mg × min for hyodeoxycholic acid (2B substrate) and 9.2-27.9 vs 8.1-75 nmol/mg × min for p-chloro-m-xylenol (1A substrate). Microsomes from a patient with chronic tyrosinemia (HL32) photoincorporated [32]5-azido-UDP-glucuronic acid at a level 1.5 times higher than the other samples, was intensely photolabeled by [32]5-azido-UDP-glucose and had significantly higher enzymatic activity toward p-chloro-m-xylenol. Immunoblot analysis using anti-UDP-glucuronosyltransferase antibodies demonstrated wide inter-individual variations in UDP-glucuronosyltransferase protein with increased UDP-glucuronosyltransferase protein in HL32 microsomes, corresponding to one of the bands photolabeled by both probes. Detailed investigation of substrate specificity, using substrates representative of both the 1A (bilirubin, 4-nitrophenol) and 2B (androsterone, testosterone) families was carried out with HL32, HL38 (age and sex matched control) and HL18 (older control). Strikingly increased (5-8-fold) glucuronidation activity was seen in comparison to HL18 only with the phenolic substrates. The results indicate that one or more phenol-specific UDP-glucuronosyltransferase 1A isoforms are expressed at above normal levels in this tyrosinemic subject.

Słowa kluczowe

EN

UDP-glucuronosyltransferase; man; liver disease; tyrosinemia

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 1999
• Tom: 46
• Numer: 2
• Opis fizyczny: p.351-363,fig.

Twórcy

autor

Little J. M.

• University of Arkansas for Medical Sciences, 4301 W.Markham, Slot 516, Little Rock, AR 72205, USA

autor

Lester R.

autor

Kuipers F.

autor

Vonk R.

autor

Mackenzie P.I.

autor

Drake R.R.

autor

Frame L.

autor

Radominska-Pandya A.

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