Participation of lipid peroxidation in the loss of hepatic drug-metabolizing activities in experimental fascioliasis in the rat
| Autor: | Odoardo Tofanetti, Roberto Maffei Facino, I. Casciarri, Claudio Genchi, Marina Carini |
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| Rok vydání: | 1989 |
| Předmět: |
Male
Fascioliasis medicine.medical_specialty Glucuronosyltransferase Liver Diseases Parasitic Membrane lipids Biology medicine.disease_cause Mixed Function Oxygenases Lipid peroxidation chemistry.chemical_compound Cytochrome P-450 Enzyme System Internal medicine medicine Animals Aspartate Aminotransferases Pharmacology Liver infection Cytochrome P450 Alanine Transaminase Rats Inbred Strains Glutathione Monooxygenase Rats Endocrinology Liver Pharmaceutical Preparations chemistry biology.protein Lipid Peroxidation Oxidative stress |
| Zdroj: | Pharmacological Research. 21:549-560 |
| ISSN: | 1043-6618 |
| DOI: | 10.1016/1043-6618(89)90196-5 |
| Popis: | Fascioliasis causes a dramatic decrease in drug-metabolizing ability of the hepatic monooxygenase (MFO) and glucuronosyltransferase (GT) enzyme systems in the rat. The present study was undertaken to determine whether lipid peroxidation is involved in the enzymatic loss. Peroxidative damage of membrane lipids (as assessed by the tissue content of malonic dialdehyde, MDA, and the diene conjugation absorption in microsomal membranes) was found to occur over the entire course of the liver infection (concomitant to a decrease in glutathione levels), and to different degrees in relation to the various steps of the parasite cycle. The onset (MDA six times the controls; ΔE 1% = 1·55 at the 20th day) coincides with the beginning of the loss of MFO (− 30%) and GT (− 20% at the 20th day), and peaks between the 30th and 40th day (MDA eight times the controls; ΔE 1% = 1·96), when the loss in the enzyme activities is maximal (MFO − 60 70% ; GT- 65 95% ). There was a strict correlation at all the observation times between the extent of lipid peroxidation and the decrease in drug metabolizing ability: this supports the view that lipid peroxidation is the major agent in the impairment of MFO and GT enzyme activities, and very likely in the initiation of the pathological degeneration of the liver tissue. As evidenced by histological examination, the phagocytic response of the liver tissue to the parasite invasion and growth leads to oxidative stress, which is the causative agent in the initiation and development of lipid peroxidation. |
| Databáze: | OpenAIRE |
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