Intercellular adhesion molecule-1-dependent stable interactions between T cells and dendritic cells determine CD8+ T cell memory.

Scholer A., Hugues S, Boissonnas A, Fetler L and Amigorena S.
Immunity. 2008 Feb;28(2):258-70.

The initiation of cytotoxic immune responses requires the direct interaction between naive CD8+ T lymphocytes and dendritic cells (DCs). Multiphoton imaging in intact lymph nodes (LNs) showed that during priming, naive T cells and DCs establish sequentially brief (i.e., minutes) and long (hours) antigen-specific contacts. We show here that the expression of the Intercellular Adhesion Molecule-1 (ICAM-1) by mature DCs is critical for long-lasting contacts with CD8+ T cells but dispensable for short-lived antigen-specific interactions. Serial brief DC-T cell contacts induced early CD8+ T cell activation, proliferation, and differentiation into effector cytotoxic T lymphocytes in the first few days after immunization. ICAM-1-deficient mature DCs, however, failed to induce fully effective priming, because CD8+ T cells produced reduced amounts of interferon gamma and were clonally depleted after 2 weeks. In addition, Icam1(-/-) mice failed to respond to rechallenge. We conclude that ICAM-1-dependent long-lasting interactions between mature DCs and naive CD8+ T cells determine the survival of activated CD8+ T cells and the establishment of effective memory.

URL: http://linkinghub.elsevier.com/retrieve/pii/S1074-7613(08)00036-8

Pub Med: http://www.ncbi.nlm.nih.gov/pubmed/18275834

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