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• W2107325819 startingPage "89" @default.
• W2107325819 abstract "The differentiation process from CD4-CD8- double-negative (DN) thymocytes to CD4+CD8+ double-positive (DP) stage is accompanied by vigorous proliferation. The resulting DP cells contain a sizable proportion of large cycling cells, but most DP cells are small resting cells. To explore the molecular mechanisms which regulate cell proliferation of DP thymocytes prior to further development, we used TCR-transgenic (Tg) mice with non-selecting MHC (Tg-Neut), which contain almost exclusively DP thymocytes that are not subject to either positive or negative selection. In Tg-Neut, the thymus contained DP cells of relatively large size, which showed higher extracellular signal-regulated kinase activity and enhanced responsiveness to mitogen compared to small DP cells. This indicates that all the large DP cells in the thymus are not positively selected and that they possess proliferative potential. When Tg-Neut mice were backcrossed with CD45 knockout mice (CD454-/- Tg-Neut), the thymus showed an increase of large DP cells and cycling cells, but a decrease of apoptotic cells. Furthermore, Bcl-2 expression and Jun N-terminal kinase activity, which are associated with resistance to apoptosis, were enhanced. These observations suggest that thymocyte proliferation in the DP stage is suppressed by a CD45-related process with regulation of mitogen-activated protein kinase and Bcl-2 unless DP cells receive TCR-mediated signals." @default.
• W2107325819 created "2016-06-24" @default.
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• W2107325819 date "1999-01-01" @default.
• W2107325819 modified "2023-09-27" @default.
• W2107325819 title "CD45 can act as a negative regulator for the transition from early to late CD4+CD8+ thymocytes" @default.
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• W2107325819 doi "https://doi.org/10.1093/intimm/11.1.89" @default.
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