Glutathione concentrations and glutathione S-transferase activity in human colonic neoplasms
| Autor: | K. K. Khoo, Ross N. Butler, Ian C. Roberts-Thomson, Martin J. Fettman, W. J. Butler, Z. Moraby |
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| Rok vydání: | 1994 |
| Předmět: |
Adenoma
Adult Male medicine.medical_specialty Colorectal cancer Colon Flow cytometry chemistry.chemical_compound Adenomatous Polyps Reference Values Internal medicine medicine Humans Intestinal Mucosa Carcinogen Aged Glutathione Transferase chemistry.chemical_classification Aged 80 and over Hepatology medicine.diagnostic_test Cell growth business.industry Osmolar Concentration Gastroenterology Cancer Glutathione Middle Aged medicine.disease Endocrinology Enzyme chemistry Colonic Neoplasms Female business Xenobiotic Cell Division |
| Zdroj: | Journal of gastroenterology and hepatology. 9(1) |
| ISSN: | 0815-9319 |
| Popis: | Tissue concentrations of glutathione (GSH) and the activity of glutathione S-transferases (GST) are relevant to the inactivation of a variety of xenobiotics including carcinogens and anti-neoplastic drugs. In this study, GSH concentrations and GST activity were determined in 25 adenomatous polyps removed at colonoscopy, and in cancer and uninvolved 'normal' mucosa from 58 operative specimens containing colon cancer. We also examined the relationship between GSH concentrations, GST activity and rates of cell proliferation as assessed by flow cytometry. Concentrations of GSH were significantly higher in adenomas (P = 0.001) and cancer (P = 0.001) than in uninvolved mucosa while GST activity was significantly higher in cancer (P = 0.007). There was a positive relationship between GSH concentrations and GST activity in adenomas (P = 0.001) but not in uninvolved mucosa (P = 0.06) or cancer (P = 0.4). Concentrations of GSH and GST activity were independent of results from flow cytometry. The higher concentrations of GSH in colonic neoplasms and the raised activity of GST in cancer may contribute to their resistance to anti-neoplastic drugs. |
| Databáze: | OpenAIRE |
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