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Helper B cells promote cytotoxic T cell survival and proliferation independently of antigen presentation through CD27/CD70 interactions.

PMID: 18209030 (view PubMed database entry)
DOI: 10.4049/jimmunol.180.3.1362 (read at publisher's website )

Sara Deola, Monica C Panelli, Dragan Maric, Silvia Selleri, Natalia I Dmitrieva, Ching Y Voss, Harvey Klein, David Stroncek, Ena Wang, Francesco M Marincola,

CD8-expressing cytotoxic T cell (CTL) interactions with APCs and helper T cells determine their function and ability to survive. In this study, we describe a novel interaction independent of Ag presentation between activated CTLs and bystander CD19-expressing B lymphocytes. Ag-stimulated CTLs serially engage autologous B lymphocytes through CD27/CD70 contact that promotes their survival and proliferation. Moreover, these interactions induce the release of proinflammatory cytokines that follows two general patterns: 1) an epitope-dependent enhancement of cytokine release, and 2) a previously undiscovered coordinate release of cytokines independent of epitope exposure. The latter includes chemoattractants targeting activated T cells. As a result, activated T cells are attracted to B cells, which exert a "helper" role in lymphatic organs or in areas of inflammation. This observation provides a mechanistic explanation to previously reported experimental observations suggesting that B cells are required for T cell priming in vivo.

J Immunol (Journal of immunology (Baltimore, Md. : 1950))
[2008, 180(3):1362-1372]

Cited: 38 times

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