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Developing neonatal rabbit appendix, a primary lymphoid organ, is seeded by immature blood-borne B cells: evidence for roles for CD62L/PNAd, CCR7/CCL21, alpha4beta1 and LFA-1.

Abstract：

:Young rabbit appendix is a homologue of chicken bursa of Fabricius; both are crucial sites for preimmune B-cell repertoire development. We describe here some of the molecules involved in the multi-step recruitment of blood-borne B cells into neonatal rabbit developing appendix. Sialyl-Lewis-x, CD62L and integrins such as LFA-1 and alpha4beta1 were detected on B cells in peripheral blood. Peripheral lymph node addressin (PNAd), a CD62L counter-receptor was observed on appendix HEV. We also detected chemokine receptor CCR7 on peripheral blood B cells and one of the CCR7 ligands, CCL21, on appendix HEV but not in appendix follicles. Higher levels of CXCR5 expression compared to CCR7 on appendix B cells suggest that CXCR5 may be involved in recruitment of B cells into follicles. The proportions of appendix B cells expressing CD62L, sialyl-Lewis-x and alpha4beta1 declined between day 3 and 4 weeks after birth while percentages of Lewis-x+ appendix B cells increased. These changes correlate with the stage of repertoire diversification by gene conversion in both rabbits and chickens. The cross-reactivity of antibodies to mouse or human adhesion molecules described in this study indicates that some of the structures of these important molecules are conserved across species.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Sinha RK,Mage RG

doi

10.1016/j.dci.2004.01.003

keywords:

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

829-41

issue

7-8

eissn

0145-305X

issn

1879-0089

pii

S0145305X04000151

journal_volume

28

pub_type

杂志文章

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