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- W1558801857 abstract "Abstract T cell maturation in an extrathymic environment has been studied using as a model the congenitally athymic nude mouse. Phenotypic analyses as a function of age were conducted on lymphocytes obtained from the spleens and lymph nodes of nude mice through use of mAb recognizing T cell surface markers and multiparameter flow cytometry. The data show that nude mice accumulate increasing numbers of lymphocytes bearing Thy-1, CD3, CD4, and CD8 with age characterized by a progression from heterogeneous dim to more homogeneous bright expression. In contrast, the expression of heat-stable Ag (HSA), a marker of immature thymocytes, decreases with age. By analogy to intrathymic maturation, spleens and lymph nodes in nude mice contain T cells defined as immature, transitional, and mature based on the expression of these markers. Although the proportion of CD4+ and CD8+ T cells associated with bright CD3 expression increases with age, at no age are significant numbers of CD4+8+ cells observed, in contrast to intrathymic T cell maturation. In addition to the frequently observed inversion in the ratio of CD4 to CD8, the CD8 T cell subpopulation in older nude mice contains mainly mature cells (CD8+, CD3+, HSA-) whereas only 50% of CD4+ T cells express the mature (CD4+, CD3+, HSA-) phenotype. At any age, the spectrum of phenotypes observed indicates that lymph nodes contain more mature T cells than spleen, suggesting a role for environmental Ag in driving extrathymic maturation, a process occurring most efficiently among CD8+ T cells. Because extrathymic maturation mirrors some but not all aspects of the intrathymic pathway, we propose that the nude mouse may be a useful model for further dissecting those interactions crucial to establishing the T cell repertoire in euthymic individuals as well as elucidating the contribution of extrathymically derived T cells to the peripheral immune system." @default.
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- W1558801857 date "1992-03-15" @default.
- W1558801857 modified "2023-10-06" @default.
- W1558801857 title "Extrathymic T cell maturation. Phenotypic analysis of T cell subsets in nude mice as a function of age." @default.
- W1558801857 doi "https://doi.org/10.4049/jimmunol.148.6.1620" @default.
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