| Purification, induction, and distribution of placental glutathione transferase: a new marker enzyme for preneoplastic cells in the rat chemical hepatocarcinogenesis. | |
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MedLine Citation:
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PMID: 3923485 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A polypeptide of Mr 26,000 and pI 6.7 that was markedly increased in rat livers bearing hyperplastic nodules (HNs) induced by chemical carcinogens was identified immunochemically as the subunit of neutral glutathione (GSH) transferase (GSHTase; RX:glutathione R-transferase, EC 2.5.1.18; also called GSH S-transferase) purified from placenta (GSHTase-P) and was demonstrated immunohistochemically to be localized in preneoplastic foci and HNs. In the present study, GSHTase-P has been purified from the HN-bearing liver, and the distribution and inducibility have been examined quantitatively using anti-GSHTase-P antibody. Elevation of GSHTase-P in the HN-bearing livers was also confirmed by in vitro translation of mRNAs isolated from the HN-bearing livers. The purified GSHTase-P was homogeneous in size but had two charge isomers on two-dimensional gel electrophoresis. In normal tissues, including liver, placenta, and fetal liver, the protein content of GSHTase-P was generally low but was significantly high in kidney and pancreas. In contrast, the amount of GSHTase-P in HN-bearing livers (primary hepatomas) and transplantable Morris hepatoma 5123D were several 10-fold higher than that in normal liver but were undetectably low in transplantable Yoshida ascites hepatoma AH 130. Different from ordinary drug-metabolizing enzymes, GSHTase-P was uninducible by administration of drugs and carcinogens prior to appearance of the preneoplastic foci and HNs. In addition, species specificity of GSHTase-P was low as it was crossreactive among rat, hamster, and human. |
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Authors:
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K Satoh; A Kitahara; Y Soma; Y Inaba; I Hatayama; K Sato |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 82 ISSN: 0027-8424 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 1985 Jun |
Date Detail:
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Created Date: 1985-07-25 Completed Date: 1985-07-25 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 3964-8 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acids
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analysis Animals Carcinogens / pharmacology Enzyme Induction / drug effects Glutathione Transferase / immunology, isolation & purification*, metabolism Immunodiffusion Isoenzymes / immunology, isolation & purification, metabolism Liver Neoplasms, Experimental / enzymology* Male Placenta / enzymology* Precancerous Conditions / enzymology* RNA, Messenger / metabolism Rats |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 0/Carcinogens; 0/Isoenzymes; 0/RNA, Messenger; EC 2.5.1.18/Glutathione Transferase |
| Comments/Corrections | |
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