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Heterogeneous alterations of UDP-glucuronosyltransferases in mouse hepatic foci

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Summary

UDP-glucuronosyltransferase (UDPGT) was studied immunohistochemically in hepatic foci and nodules of N-nitrosomorpholine-treated mice. Serial sections were stained for glucose-6-phosphatase (G6Pase). It was found that a high percentage of G6Pase-negative liver foci and nodules were also UDPGT-negative (34%). In addition, G6Pase-negative foci without altered UDPGT phenotype (30%) and UDPGT-negative foci without altered G6Pase phenotype (8%) were detected. G6Pase-positive foci were also present (24%). Interestingly, most G6Pasepositive foci were UDPGT-positive (16%). Some G6Pase-positive lesions without altered UDPGT phenotype were also found (8%). The major phenotype observed in rat hepatocarcinogenesis models (UDPGT-positive/G6Pase-negative foci) was not detectable in the mouse model. These results demonstrate heterogeneous alterations of UDPGTs in mouse hepatic foci. They furthermore suggest marked differences between the mouse and the rat in the regulation of UDPGTs in similarly induced rat hepatic foci.

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Abbreviations

UDPGT:

UDP-glucuronosyltransferase

G6Pase:

glucose-6-phosphatase

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Authors and Affiliations

  1. Institute of Toxicology, University of Tübingen, Wilhelmstrasse 56, D-7400, Tübingen, Federal Republic of Germany

    K. W. Bock & A. -B. Kobusch

  2. Department of Pathology, University of Göttingen, Robert-Koch-Strasse 40, D-3400, Göttingen, Federal Republic of Germany

    G. Fischer

Authors
  1. K. W. Bock
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  2. A. -B. Kobusch
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  3. G. Fischer
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Dedicated to Professor Dr. med. Dr. med. h.c. Herbert Remmer on the occasion of his 70th birthday

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Bock, K.W., Kobusch, A.B. & Fischer, G. Heterogeneous alterations of UDP-glucuronosyltransferases in mouse hepatic foci. J Cancer Res Clin Oncol 115, 285–289 (1989). https://doi.org/10.1007/BF00391704

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  • DOI: https://doi.org/10.1007/BF00391704

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