Role of endotoxin in 6-sulfanilamidoindazole(6SAI)-induced arthritis in rats
| Autor: | Toshiko Miyazaki, Yasushi Ohmachi, Eriha Dekura, Kunio Doi, Eisuke Kume, Kazuyuki Kitamura |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Lipopolysaccharides
Male medicine.medical_specialty Pathology Lipopolysaccharide Arthritis Administration Oral Inflammation Toxicology Pathology and Forensic Medicine Muscle hypertrophy Pathogenesis chemistry.chemical_compound Internal medicine Sulfanilamides Synovial Fluid medicine Escherichia coli Synovial fluid Animals Polymyxin B Serositis business.industry Rats Inbred Strains Cell Biology General Medicine Hyperplasia medicine.disease Arthritis Experimental Rats Endotoxins Disease Models Animal Endocrinology chemistry medicine.symptom business Infiltration (medical) Drug Antagonism |
| Zdroj: | Experimental and toxicologic pathology : official journal of the Gesellschaft fur Toxikologische Pathologie. 53(6) |
| ISSN: | 0940-2993 |
| Popis: | Summary 6-Sulfanilamidoindazole (6SAI) induces selflimiting arthritis in rats. Since close relationships exist between arthritis and endotoxin, four experiments were conducted to clarify the relationship between endotoxin and 6SAI-induced arthritis. Endotoxin levels in the plasma from the abdominal aorta and portal vein from rats that had 6SAI (500 mg/kg) administered orally for up to 7 days remained within the control values at day 1 and day 3, and were significantly elevated at day 7. Endotoxin levels in the synovial fluid from the same rats showed no significant change. Ankle swelling and redness in rats treated 11 consecutive days with 6SAI did not ameliorate when coadministered with an anti-endotoxin agent, polymyxin B sulfate. Histopathological examination on the ankles of rats treated orally with non-arthiritogenic sulfonamides including sulfonamide, sulfamethoxazole and sulfadimethoxin (250 and 500 mg/kg/day, each compound) for 2 weeks demonstrated no inflammatory changes, while hyperplasia/hypertrophy of thyroid epithelial cells were frequently observed. When histopathological changes in the ankles from rats coadministered with 6SAI and lipopolysaccharide (LPS, Escherihia coli O55:B5, 50 μg/kg, i.v.) were compared with those in rats treated with 6SAI or LPS alone, the ankles from the 6SAI+LPS treated animals had marked edematous inflammation in the synovium and surrounding connective tissues, whereas the LPS-group had only mild focal infiltration of polymorphonuclear leukocytes in the synovium and the 6SAI-group showed no apparent changes. These results suggest that endotoxin is not a direct cause but a possible acceralating factor of 6SAI-induced arthritis, and that the effects of 6SAI on gut bacteria is not related with the pathogenesis of this model. |
| Databáze: | OpenAIRE |
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