CD4+ T-Cell Help in the Tumor Milieu Is Required for Recruitment and Cytolytic Function of CD8+ T Lymphocytes
- 31 October 2010
- journal article
- Published by American Association for Cancer Research (AACR) in Cancer Research
- Vol. 70 (21), 8368-8377
- https://doi.org/10.1158/0008-5472.can-10-1322
Abstract
CD4 help for CD8+ T lymphocytes prevents tolerance and promotes the survival of effector and memory CD8+ T cells. Here, we describe additional helper functions that require CD4+ T cells within the tumor environment. CD8+ T-cell recruitment, proliferation, and effector function within the tumor were greatly enhanced by tumor-specific CD4+ T cells. Recruitment of CD8+ T cells was accelerated by IFN-γ–dependent production of chemokines. Production of interleukin-2 by tumor resident CD4+ T cells enhanced CD8+ T-cell proliferation and upregulated expression of granzyme B. These results highlight a novel role for tumor-specific CD4+ T cells in promoting CD8+ T-cell recruitment and cytolytic function, two previously unappreciated aspects of tumor-specific CD4 help. Cancer Res; 70(21); 8368–77. ©2010 AACR.Other Versions
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