Glucocorticoid and Fas ligand induced mucosal lymphocyte apoptosis after burn injury.
| Autor: | Fukuzuka K; Department of Surgery, University of Florida College of Medicine, Gainesville 32610-0286, USA., Edwards CK 3rd, Clare-Salzer M, Copeland EM 3rd, Moldawer LL, Mozingo DW |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of trauma [J Trauma] 2000 Oct; Vol. 49 (4), pp. 710-6. |
| DOI: | 10.1097/00005373-200010000-00020 |
| Abstrakt: | Background: The purpose of this study was to examine the effects of a steam burn injury on apoptosis in gut-associated lymphoid tissue and to determine whether endogenous glucocorticoid and Fas ligand signaling were involved in this process. Methods: Histologic analysis, in situ deoxynucleotidyl transferase dUTP nick-end labeling staining and annexin V and 7-amino-actinomycin-D flow cytometry of lymphocyte populations were evaluated in intraepithelial lymphocytes and Peyer's patch. Additional mice were pretreated with a glucocorticoid receptor antagonist (mifepristone) before the steam burn. Similarly, C3H/HeJ-FasL(gld) mice lacking functional Fas ligand were also studied. Results: Apoptosis was significantly increased in intraepithelial lymphocytes and Peyer's patch after the burn injury. Mifepristone pretreatment significantly reduced apoptosis in both T- and B-cell populations in intraepithelial lymphocytes after the burn injury. In contrast, the increased apoptosis seen in B-cells from Peyer's patch was not seen in C3H/HeJFasL(gld) mice, whereas the increased apoptosis in CD8+ T-cells was unaffected. Conclusion: Both corticosteroids and FasL contribute to the apoptosis in gut-associated lymphoid tissues early after burn injury. |
| Databáze: | MEDLINE |
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