The effects of cold acclimation and nitric oxide on antioxidative enzymes in rat pancreas
| Autor: | Aleksandra Jankovic, V.M. Petrović, Aleksandra Korac, Bato Korac, Ana Vasilijević, K. Micunovic, Biljana Buzadžić |
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| Rok vydání: | 2007 |
| Předmět: |
Male
medicine.medical_specialty Physiology Acclimatization Health Toxicology and Mutagenesis Glutathione reductase Nitric Oxide Toxicology Biochemistry Nitric oxide Superoxide dismutase 03 medical and health sciences chemistry.chemical_compound Internal medicine medicine Cold acclimation Animals Pancreas Glutathione Transferase 030304 developmental biology chemistry.chemical_classification Glutathione Peroxidase 0303 health sciences Reactive oxygen species biology Superoxide Dismutase Glutathione peroxidase 030302 biochemistry & molecular biology Cell Biology General Medicine Glutathione Catalase Rats Cold Temperature NG-Nitroarginine Methyl Ester Endocrinology chemistry biology.protein |
| Zdroj: | Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology. 145:641-647 |
| ISSN: | 1532-0456 |
| DOI: | 10.1016/j.cbpc.2007.02.013 |
| Popis: | Alterations of pancreatic antioxidative defense (AD) and possible nitric oxide (NO) role in AD organization of adult rats receiving l-arginine.HCl (2.25%) or N(omega)-nitro-l-arginine methyl ester (L-NAME.HCl, 0.01%) as drinking liquids and maintained at room (22+/-1 degrees C) or low (4+/-1 degrees C) temperature for 45 days were studied. For that purpose, copper, zinc- and manganese superoxide dismutase (CuZnSOD, MnSOD), catalase (CAT), glutathione peroxidase (GSH-Px), glutathione S-transferase (GST) and glutathione reductase (GR) activities were determined. Cold-induced decrease of CuZnSOD was inhibited with L-NAME, while l-arginine produced the same effect as cold in both supplemented groups. Cold acclimation elevated GSH-Px activity. l-Arginine and L-NAME expressed no effect on GSH-Px in rats kept at room temperature. L-NAME additionally elevated cold-induced GSH-Px activity, l-arginine expressing a similar trend. Cold-induced increase in GST activity was inhibited by L-NAME, while l-arginine inhibited this enzyme in both supplemented groups. Cold acclimation increased GR activity in control and L-NAME-treated group and l-arginine expressed a similar trend. Neither of the treatments affected MnSOD and CAT activities. Cold-induced changes of pancreatic AD were additionally affected by the alterations in l-arginine-NO-producing pathway. Some AD changes in the same direction with l-arginine or L-NAME point to the complexity of nitrogen compounds metabolism and function, accompanied by tissue-specific response. |
| Databáze: | OpenAIRE |
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