Impaired interleukin-2 synthesis and T cell proliferation following antibody-mediated CD3 and CD2 or CD28 cross-linking in trans: evidence that T cell activation requires the engagement of costimulatory molecules within the immunological synapse

Immunological Investigations
Carrie L WatsonDavid W Hoskin

Abstract

Although the T cell costimulatory molecules CD2 and CD28 are enriched within the immunological synapse (IS), it has been suggested that costimulatory molecules need not be localized to the contact site between a T cell and an antigen-presenting cell (APC) in order to costimulate T cell activation. To determine whether CD2 or CD28 engagement outside of the IS is sufficient to costimulate T cell activation, we compared mouse T cell responses to anti-CD3 and anti-CD2 monoclonal antibodies (mAbs) or anti-CD3 and anti-CD28 mAbs immobilized on the same, i.e., in cis, or on different, i.e., in trans, 10 micron polystyrene microspheres. In comparison to T cells that were stimulated with co-immobilized anti-CD3 and anti-CD2 or anti-CD28 mAbs, DNA synthesis, interleukin (IL)-2 production, and cellular proliferation were all severely impaired following T cell stimulation with anti-CD3 and anti-CD2 mAbs or anti-CD3 and anti-CD28 mAbs on different microspheres. Deficient cellular proliferation and IL-2 synthesis by T cells that experienced CD3 and CD2 or CD28 cross-linking in trans provides evidence that costimulatory molecules must function in the context of the IS for optimal T cell activation.

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Citations

Jan 18, 2015·Clinical Immunology : the Official Journal of the Clinical Immunology Society·Ulrike ErbenAnja A Kühl
Mar 4, 2014·PloS One·Mariano Sanchez-LockhartJim Miller

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