Thymus Colonization: Who, How, How Many?

Thymus Colonization: Who, How, How Many? De novo generation of T cells depends on continual colonization of the thymus by bone marrow-derived progenitors. Thymus seeding progenitors (TSPs) constitute a heterogeneous population comprising multipotent and lineage-restricted cell types. Entry into the thymic microenvironment is tightly controlled and recent quantitative studies have revealed that the adult murine thymus only contains approximately 160 niches to accommodate TSPs. Of these niches only about 6% are open for seeding on average at steady-state. Here, I review the state of understanding of colonization of the adult murine thymus with a particular focus on past and current controversies in the field. Improving thymus colonization and/or maintaining intact TSP niches during the course of pre-conditioning regimens are likely to be critical for efficient T-cell regeneration after hematopoietic stem cell transplantation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archivum Immunologiae et Therapiae Experimentalis Springer Journals

Thymus Colonization: Who, How, How Many?

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Publisher
Springer Journals
Copyright
Copyright © 2017 by L. Hirszfeld Institute of Immunology and Experimental Therapy, Wroclaw, Poland
Subject
Biomedicine; Immunology; Pharmacology/Toxicology
ISSN
0004-069X
eISSN
1661-4917
D.O.I.
10.1007/s00005-017-0503-5
Publisher site
See Article on Publisher Site

Abstract

De novo generation of T cells depends on continual colonization of the thymus by bone marrow-derived progenitors. Thymus seeding progenitors (TSPs) constitute a heterogeneous population comprising multipotent and lineage-restricted cell types. Entry into the thymic microenvironment is tightly controlled and recent quantitative studies have revealed that the adult murine thymus only contains approximately 160 niches to accommodate TSPs. Of these niches only about 6% are open for seeding on average at steady-state. Here, I review the state of understanding of colonization of the adult murine thymus with a particular focus on past and current controversies in the field. Improving thymus colonization and/or maintaining intact TSP niches during the course of pre-conditioning regimens are likely to be critical for efficient T-cell regeneration after hematopoietic stem cell transplantation.

Journal

Archivum Immunologiae et Therapiae ExperimentalisSpringer Journals

Published: Dec 29, 2017

References

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