| The influence of diet on the regional distribution of glutathione S-transferase activity in channel catfish intestine. | |
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MedLine Citation:
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PMID: 10711630 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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There is evidence that glutathione conjugates are the major metabolites formed following systemic uptake of carcinogenic contaminants from the intestine. The effect of commercial diet versus a semi-purified diet on the distribution of glutathione S-transferase (GST) activity was examined in proximal, medial, and distal sections of catfish intestine. The bulk of GST activity with 1-chloro-2,4-dinitrobenzene, ethacrynic acid, and 3H-benzo[a]pyrene-4,5-oxide, and the percent cytosolic protein cross-reacting with anti-catfish GST-pi were in the more proximal segments and dropped off distally in the two diet groups. However, the total GST-pi cross-reacting protein in the proximal section was significantly higher in fish fed a chow diet. Western blot analysis revealed pi-class GST to be expressed principally in the proximal intestine. Cytosol samples cross-reacted with antibodies to human GST-alpha, -mu, and -pi, but not -theta, classes. Alpha-like GST isoforms of MW 26,200 and 24,600, absent in sections from fish fed a purified diet, were differentially expressed only in the distal section of chow-fed fish. These results indicate that diet significantly elicits regional differences in GST protein levels, that components of the commercial chow affect GST protein expression in the distal intestine, and that maintenance diet should be taken into consideration during dietary exposure studies. |
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Authors:
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B K Gadagbui; M O James |
Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of biochemical and molecular toxicology Volume: 14 ISSN: 1095-6670 ISO Abbreviation: J. Biochem. Mol. Toxicol. Publication Date: 2000 |
Date Detail:
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Created Date: 2000-03-24 Completed Date: 2000-03-24 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 9717231 Medline TA: J Biochem Mol Toxicol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 148-54 Citation Subset: IM |
Affiliation:
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Department of Medicinal Chemistry, College of Pharmacy, University of Florida, Gainesville 32610-0485, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blotting, Western Diet* Glutathione Transferase / metabolism* Humans Ictaluridae Intestinal Mucosa / enzymology Intestines / enzymology* |
| Grant Support | |
ID/Acronym/Agency:
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ES-05781/ES/NIEHS NIH HHS; ES-07375/ES/NIEHS NIH HHS |
| Chemical | |
Reg. No./Substance:
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EC 2.5.1.18/Glutathione Transferase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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