CXCL12 mediates CCR7-independent homing of central memory cells, but not naive T cells, in peripheral lymph nodes

J Exp Med. 2004 Apr 19;199(8):1113-20. doi: 10.1084/jem.20031645.

Abstract

Central memory CD8(+) T cells (T(CM)) confer superior protective immunity against infections compared with other T cell subsets. T(CM) recirculate mainly through secondary lymphoid organs, including peripheral lymph nodes (PLNs). Here, we report that T(CM), unlike naive T cells, can home to PLNs in both a CCR7-dependent and -independent manner. Homing experiments in paucity of lymph node T cells (plt/plt) mice, which do not express CCR7 ligands in secondary lymphoid organs, revealed that T(CM) migrate to PLNs at approximately 20% of wild-type (WT) levels, whereas homing of naive T cells was reduced by 95%. Accordingly, a large fraction of endogenous CD8(+) T cells in plt/plt PLNs displayed a T(CM) phenotype. Intravital microscopy of plt/plt subiliac lymph nodes showed that T(CM) rolled and firmly adhered (sticking) in high endothelial venules (HEVs), whereas naive T cells were incapable of sticking. Sticking of T(CM) in plt/plt HEVs was pertussis toxin sensitive and was blocked by anti-CXCL12 (SDF-1alpha). Anti-CXCL12 also reduced homing of T(CM) to PLNs in WT animals by 20%, indicating a nonredundant role for this chemokine in the presence of physiologic CCR7 agonists. Together, these data distinguish naive T cells from T(CM), whereby only the latter display greater migratory flexibility by virtue of their increased responsiveness to both CCR7 ligands and CXCL12 during homing to PLN.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • CD8-Positive T-Lymphocytes / immunology*
  • CD8-Positive T-Lymphocytes / physiology*
  • Cell Movement / drug effects
  • Chemokine CXCL12
  • Chemokines, CXC / physiology*
  • Immunologic Memory
  • Lymph Nodes / cytology
  • Lymph Nodes / immunology
  • Mice
  • Mice, Inbred BALB C
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Mice, Mutant Strains
  • Mice, Transgenic
  • Pertussis Toxin / pharmacology
  • Receptors, CCR7
  • Receptors, Chemokine / physiology*
  • Receptors, Lymphocyte Homing / physiology
  • T-Lymphocyte Subsets / immunology
  • T-Lymphocyte Subsets / physiology

Substances

  • Ccr7 protein, mouse
  • Chemokine CXCL12
  • Chemokines, CXC
  • Cxcl12 protein, mouse
  • Receptors, CCR7
  • Receptors, Chemokine
  • Receptors, Lymphocyte Homing
  • Pertussis Toxin