thymic and postthymic regulation of naïve cd4+ t-cell lineage fates in humans and mice models
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2016
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Abstract
Our understanding of how thymocytes differentiate into many subtypes has been increased progressively in its complexity. At early life, the thymus provides a suitable microenvironment with specific combination of stromal cells, growth factors, cytokines, and chemokines to induce the bone marrow lymphoid progenitor T-cell precursors into single-positive CD4+ and CD8+ T effectors and CD4+CD25+ T-regulatory cells (Tregs). At postthymic compartments, the CD4+ T-cells acquire distinct phenotypes which include the classical T-helper 1 (Th1), T-helper 2 (Th2), T-helper 9 (Th9), T-helper 17 (Th17), follicular helper T-cell (Tfh), and induced T-regulatory cells (iTregs), such as the regulatory type 1 cells (Tr1) and transforming growth factor-β- (TGF-β-) producing CD4+ T-cells (Th3). Tregs represent only a small fraction, 5–10% in mice and 1-2% in humans, of the overall CD4+ T-cells in lymphoid tissues but are essential for immunoregulatory circuits mediating the inhibition and expansion of all lineages of T-cells. In this paper, we first provide an overview of the major cell-intrinsic developmental programs that regulate T-cell lineage fates in thymus and periphery. Next, we introduce the SV40 immortomouse as a relevant mice model for implementation of new approaches to investigate thymus organogenesis, CD4 and CD8 development, and thymus cells tumorogenesis.
| Reference Key |
belizrio2016mediatorsthymic
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|---|---|
| Authors | ;José E. Belizário;Wesley Brandão;Cristiano Rossato;Jean Pierre Peron |
| Journal | polyhedron |
| Year | 2016 |
| DOI |
10.1155/2016/9523628
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| URL | |
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