Induction of Apoptosis in Mouse Thymocytes by Cyclosporin A: AnIn VitroStudy
| Autor: | N Fabien, S. Saiagh, J. C. Monier, C. Auger |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Male
medicine.medical_specialty Programmed cell death CD3 Immunology Fluorescent Antibody Technique Apoptosis Thymus Gland Toxicology Mice chemistry.chemical_compound Cyclosporin a Internal medicine medicine Animals Immunology and Allergy Propidium iodide Fragmentation (cell biology) Cells Cultured Electrophoresis Agar Gel Pharmacology Mice Inbred BALB C biology DNA General Medicine Flow Cytometry Molecular biology Lymphocyte Subsets Microscopy Electron Thymocyte Endocrinology chemistry Cyclosporine Microscopy Electron Scanning biology.protein CD8 DNA Damage |
| Zdroj: | Immunopharmacology and Immunotoxicology. 16:553-576 |
| ISSN: | 1532-2513 0892-3973 |
| DOI: | 10.3109/08923979409019739 |
| Popis: | We investigated the in vivo effect of cyclosporin A (CsA) on mouse thymus and thymocytes. Administration of CsA (10 mg/kg of body weight) was found to induce a marked reduction in the size, weight and consistency of the thymus. These modifications were associated with thymic reticulo-epithelial cells (TREC) and thymocyte damage. Some of the damaged thymocytes displayed characteristic of cells undergoing apoptosis. Ultrastructural study of thymocytes and thymic tissue, as well as DNA electrophoresis of thymocytes, showed chromatin condensation, cellular shrinkage, and nuclear fragmentation in oligonucleosomal fragments. DNA labeling with propidium iodide (PI) of thymocytes from CsA treated mice cultured for 24 hrs showed an increased number of apoptotic nuclei. Furthermore, flow cytometric analysis using monoclonal antibodies (mAbs) specific for thymocyte subsets confirmed that CsA induces a large decrease in the relative number of mature single positive (SP) CD4+CD8- and CD8+CD4- thymocytes expressing high densities of CD3 and T cell receptor ab (TCR alpha beta) surface molecules, but also a decrease in the absolute number of the other thymocyte subsets. These results suggest that CsA causes macroscopic and ultrastructural modifications of the thymus, associated with an active process of cell death in mouse thymocytes in vivo. In line with these results we formulate a hypothesis concerning the stage of T-cell development at which CsA induces apoptosis. |
| Databáze: | OpenAIRE |
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