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Nat Immunol. 2009 Nov;10(11):1193-9. doi: 10.1038/ni.1789. Epub 2009 Sep 27.

Chemokine CXCL13 is essential for lymph node initiation and is induced by retinoic acid and neuronal stimulation.

Author information

1
Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands.

Abstract

The location of embryonic lymph node development is determined by the initial clustering of lymphoid tissue-inducer (LTi) cells. Here we demonstrate that both the chemokine CXCL13 and the chemokine CCL21 attracted LTi cells at embryonic days 12.5-14.5 and that initial clustering depended exclusively on CXCL13. Retinoic acid (RA) induced early CXCL13 expression in stromal organizer cells independently of lymphotoxin signaling. Notably, neurons adjacent to the lymph node anlagen expressed enzymes essential for RA synthesis. Furthermore, stimulation of parasymphathetic neural output in adults led to RA receptor (RAR)-dependent induction of CXCL13 in the gut. Therefore, our data show that the initiation of lymph node development is controlled by RA-mediated expression of CXCL13 and suggest that RA may be provided by adjacent neurons.

PMID:
19783990
PMCID:
PMC2771164
DOI:
10.1038/ni.1789
[Indexed for MEDLINE]
Free PMC Article

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