Endothelial cells act as gatekeepers for LTβRdependent thymocyte emigration

Kieran D. James, Emilie J. Cosway, Beth Lucas, Andrea J. White, Sonia M. Parnell, Manuela Carvalho-Gaspar, Alexei V. Tumanov, Graham Anderson, William E. Jenkinson

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The emigration of mature thymocytes from the thymus is critical for establishing peripheral T cell compartments. However, the pathways controlling this process and the timing of egress in relation to postselection developmental stages are poorly defined. Here, we reexamine thymocyte egress and test current and opposing models in relation to the requirement for LTβR, a regulator of thymic microenvironments and thymocyte emigration. Using cell-specific gene targeting, we show that the requirement for LTβR in thymocyte egress is distinct from its control of thymic epithelium and instead maps to expression by endothelial cells. By separating emigration into sequential phases of perivascular space (PVS) entry and transendothelial migration, we reveal a developmentally ordered program of egress where LTβR operates to rate limit access to the PVS. Collectively, we show the process of thymic emigration ensures only the most mature thymocytes leave the thymus and demonstrate a role for LTβR in the initiation of thymus emigration that segregates from its control of medulla organization.

Original languageEnglish (US)
Pages (from-to)2984-2993
Number of pages10
JournalJournal of Experimental Medicine
Issue number12
StatePublished - Dec 1 2018

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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