Abstract
We examined the requirement for and cooperation between CD28 and inducible costimulator (ICOS) in effective T helper (TH) cell responses in vivo. We found that both CD28 and ICOS were critical in determining the outcome of an immune response; cytolytic T lymphocyte–associated antigen 4–immunoglobulin (CTLA-4–Ig), ICOS-Ig and/or a neutralizing ICOS monoclonal antibody attenuated T cell expansion, TH2 cytokine production and eosinophilic inflammation. CD28-dependent signaling was essential during priming, whereas ICOS–B7RP-1 regulated TH effector responses, and the up-regulation of chemokine receptors that determine T cell migration. Our data suggests a scenario whereby both molecules regulate the outcome of the immune response but play separate key roles: CD28 primes T cells and ICOS regulates effector responses.
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Acknowledgements
We thank K. McDonald for purification of ICOS-Ig, C. Groves for advice on FACS analysis and S. Manning for his contributions to this work.
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Gonzalo, J., Tian, J., Delaney, T. et al. ICOS is critical for T helper cell–mediated lung mucosal inflammatory responses. Nat Immunol 2, 597–604 (2001). https://doi.org/10.1038/89739
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DOI: https://doi.org/10.1038/89739
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