Published online
doi:10.1084/jem.20090458
The Journal of Experimental Medicine, Vol. 206, No. 4, 731-734
The Rockefeller University Press, 0022-1007 $30.00
© Cyster
Settling the thymus: immigration requirements
Jason G. Cyster
J.G.C. is at Howard Hughes Medical Institute and Department of Microbiology and Immunology, University of California San Francisco, San Francisco, CA 94143
CORRESPONDENCE J.G.C.: Jason.Cyster{at}ucsf.edu
ABSTRACT
Thymus settling by precursor cells is essential for the production of T cells, yet the immigration requirements are poorly defined. P-selectin and CC chemokine receptor-9 (CCR9) are involved, and settling is favored when existing residents have moved on. A new study strengthens the correlation between niche emptying and the induction of thymic P-selectin and CCR9 ligand, and provides evidence for feedback from the periphery to thymic P-selectin expression via sphingosine-1-phosphate.
© 2009 Cyster
This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.jem.org/misc/terms.shtml). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/).

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