Do thymically and strictly extrathymically developing T cells generate similar immune responses? - PubMed (original) (raw)
Comparative Study
. 2004 Apr 15;103(8):3102-10.
doi: 10.1182/blood-2003-09-3311. Epub 2003 Dec 24.
Affiliations
- PMID: 15070691
- DOI: 10.1182/blood-2003-09-3311
Free article
Comparative Study
Do thymically and strictly extrathymically developing T cells generate similar immune responses?
Marie-Eve Blais et al. Blood. 2004.
Free article
Abstract
If present in sufficient numbers, could extrathymic T cells substitute for thymus-derived T cells? To address this issue, we studied extrathymic T cells that develop in athymic mice under the influence of oncostatin M (OM). In this model, extensive T-cell development is probably due to amplification of a minor pathway of T-cell differentiation taking place only in the lymph nodes. Extrathymic CD4 T cells expanded poorly and were deficient in providing B-cell help after infection with vesicular stomatitis virus (VSV) and lymphocytic choriomeningitis virus (LCMV). Compared with classic T cells, stimulated extrathymic CD8 T cells produced copious amounts of interferon gamma (IFN-gamma), and their expansion was precocious but of limited amplitude because of a high apoptosis rate. Consequently, although extrathymic cytotoxic T lymphocytes (CTLs) responded to LCMV infection, as evidenced by the expansion of GP33-41 tetramer-positive CD8 T cells, they were unable to eradicate the virus. Our data indicate that the site of development impinges on T-cell quality and function and that extrathymic T cells functionally cannot substitute for classical thymic T cells.
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