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PlexinD1 glycoprotein controls migration of positively selected thymocytes into the medulla.

Abstract：

:Precise intrathymic cell migration is important for thymocyte maturation and organ architecture. The orchestration of thymocyte trafficking, however, is not well understood at a molecular level. Here, we described highly regulated plexinD1 expression on CD4+CD8+ double positive (DP) thymocytes. PlexinD1 expression was further affected by the engagement of T cell receptor complex. Activation of plexinD1 via the ligand, semaphorin 3E, repressed CCL25 chemokine signaling via its receptor CCR9 in CD69+ thymocytes. In the absence of plexinD1, CD69+ thymocytes remained in the cortex, maturing to form ectopic single positive (SP) thymocyte clusters in Plxnd1-deficient fetal liver cell-transplanted mice. As a consequence, the boundary between DP and SP thymocytes at corticomedullary junctions was disrupted and medullary structures formed under the thymic capsule. These results demonstrate the importance of plexinD1 in directing migration of maturing thymocytes via modulation of biological responses to chemokine gradients.

journal_name

Immunity

journal_title

Immunity

authors

Choi YI,Duke-Cohan JS,Ahmed WB,Handley MA,Mann F,Epstein JA,Clayton LK,Reinherz EL

doi

10.1016/j.immuni.2008.10.008

subject

Has Abstract

pub_date

2008-12-19 00:00:00

pages

888-98

issue

6

eissn

1074-7613

issn

1097-4180

pii

S1074-7613(08)00498-6

journal_volume

29

pub_type

杂志文章

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