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PMID: 21804558 Published · epublish English Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't

Autocrine IL-2 is required for secondary population expansion of CD8(+) memory T cells.

Nature immunology ·Vol. 12 ·No. 9 ·2011-07-31 ·Pages 908-13

Feau S, Arens R, Togher S, Schoenberger SP

Abstract

Two competing theories have been put forward to explain the role of CD4(+) T cells in priming CD8(+) memory T cells: one proposes paracrine secretion of interleukin 2 (IL-2); the other proposes the activation of antigen-presenting cells (APCs) via the costimulatory molecule CD40 and its ligand CD40L. We investigated the requirement for IL-2 by the relevant three cell types in vivo and found that CD8(+) T cells, rather than CD4(+) T cells or dendritic cells (DCs), produced the IL-2 necessary for CD8(+) T cell memory. Il2(-/-) CD4(+) T cells were able to provide help only if their ability to transmit signals via CD40L was intact. Our findings reconcile contradictory elements implicit in each model noted above by showing that CD4(+) T cells activate APCs through a CD40L-dependent mechanism to enable autocrine production of IL-2 in CD8(+) memory T cells.

MeSH Terms
Animals Autocrine Communication CD4-Positive T-Lymphocytes/cytology,immunology,metabolism CD40 Antigens/immunology,metabolism CD40 Ligand/immunology,metabolism CD8-Positive T-Lymphocytes/cytology,immunology,metabolism Cell Proliferation Dendritic Cells/cytology,immunology,metabolism Flow Cytometry Immunologic Memory Interleukin-2/immunology,metabolism Listeria monocytogenes/growth & development Listeriosis/immunology,microbiology Lymphocyte Activation Mice Mice, Inbred C57BL Mice, Knockout Signal Transduction/immunology
Chemicals
CD40 Antigens Interleukin-2 CD40 Ligand
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Feau Sonia
Laboratory of Cellular Immunology, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA.
Arens Ramon
Togher Susan
Schoenberger Stephen P
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Article Info
Journal
Nature immunology
Abbr.
Nat Immunol
ISSN
1529-2916
Published
2011-07-31
Epub
2011-00-31
Pages
908-13
Language
English
Region
United States
NLM ID
100941354
PMCID
PMC3388550
Subset
IM
Grants
NIAID NIH HHS · R01 AI076972 · United States
NCI NIH HHS · R01 CA081261 · United States
NCI NIH HHS · R01CA81261 · United States
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