The interaction of gamma delta T cells with activated macrophages is a property of the V gamma 1 subset

Dalton, Jane E., Pearson, Jayne, Scott, Phillip and Carding, Simon R. (2003) The interaction of gamma delta T cells with activated macrophages is a property of the V gamma 1 subset. Journal of Immunology, 171 (12). pp. 6488-6494. ISSN 0022-1767

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Immunoregulation is an emerging paradigm of gammadelta T cell function. The mechanisms by which gammadelta T cells mediate this function, however, are not clear. Studies have identified a direct role for gammadelta T cells in resolving the host immune response to infection, by eliminating populations of activated macrophages. The aim of this study was to identify macrophage-reactive gammadelta T cells and establish the requirements/outcomes of macrophage-gammadelta T cell interactions during the immune response to the intracellular bacterium, Listeria monocytogenes (Lm). Using a macrophage-T cell coculture system in which peritoneal macrophages from naive or Lm-infected TCRdelta(-/-) mice were incubated with splenocytes from naive and Lm-infected alphabeta/gammadelta T cell-deficient and wild-type mice, the ability to bind macrophages was shown to be restricted to gammadelta T cells and the GV5S1 (Vgamma1) subset of gammadelta T cells. Macrophage adherence resulted in a 4- to 10-fold enrichment of Vgamma1(+) T cells. Enrichment of Vgamma1 T cells was dependent upon the activation status of macrophages, but independent of the activation status of gammadelta T cells. Vgamma1 T cells were cytotoxic for activated macrophages with both the binding to and killing of macrophages being TCR dependent because anti-TCRgammadelta Abs inhibited both Vgamma1 binding and killing activities. These studies establish the identity of macrophage cytotoxic gammadelta T cells, the conditions under which this interaction occurs, and the outcome of this interaction. These findings are concordant with the involvement of Vgamma1 T cells in macrophage homeostasis during the resolution of pathogen-mediated immune responses.

Item Type: Article
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Gastroenterology and Gut Biology
Depositing User: Rhiannon Harvey
Date Deposited: 14 Jul 2011 11:16
Last Modified: 10 Aug 2023 14:30
DOI: 10.4049/jimmunol.171.12.6488

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