TY - JOUR
T1 - Polyfunctional CD4+ T cells are essential for eradicating advanced B-cell lymphoma after chemotherapy
AU - Ding, Zhi Chun
AU - Huang, Lei
AU - Blazar, Bruce R.
AU - Yagita, Hideo
AU - Mellor, Andrew L.
AU - Munn, David H.
AU - Zhou, Gang
PY - 2012/9/13
Y1 - 2012/9/13
N2 - The finding that many chemotherapeutic agents have immunostimulatory effects has provided the impetus to combine chemotherapy and immunotherapy for synergistic antitumor effects. However, the critical determinants of effective antitumor immunity after chemotherapy have not been defined. Here we report that adoptive transfer of tumor-specific CD4+ T cells after chemotherapy with cyclophosphamide gave rise to polyfunctional CD4+ effector cells, which in turn intensified the inflammatory milieu and enhanced the activation of CD8+ T cells in the tumor microenvironment. Although this combined chemoimmunotherapy initially resulted in progressive regression of advanced B-cell lymphoma, its therapeutic efficacy was not durable and most mice succumbed to late relapse. Notably, relapse was associated with acquisition of a tolerized phenotype in tumor-specific CD4+ T cells, characterized by overexpression of program death-1 (PD-1). Remarkably, effective antitumor immunity was maintained and cure became prevalent when polyfunctional CD4+ effector cells were prevented from undergoing PD-1-mediated tolerization, either by antibody blockade of the PD-1-PD-L1 pathway, or targeted ablation of PD-1 in tumors-pecific CD4+ T cells. Our study suggests that tumor-reactive CD4+ T cells act as the "gatekeepers" of the host antitumor immunity in the postchemotherapy setting, thereby their functional status governs the choice between eradication versus regrowth of residual tumors.
AB - The finding that many chemotherapeutic agents have immunostimulatory effects has provided the impetus to combine chemotherapy and immunotherapy for synergistic antitumor effects. However, the critical determinants of effective antitumor immunity after chemotherapy have not been defined. Here we report that adoptive transfer of tumor-specific CD4+ T cells after chemotherapy with cyclophosphamide gave rise to polyfunctional CD4+ effector cells, which in turn intensified the inflammatory milieu and enhanced the activation of CD8+ T cells in the tumor microenvironment. Although this combined chemoimmunotherapy initially resulted in progressive regression of advanced B-cell lymphoma, its therapeutic efficacy was not durable and most mice succumbed to late relapse. Notably, relapse was associated with acquisition of a tolerized phenotype in tumor-specific CD4+ T cells, characterized by overexpression of program death-1 (PD-1). Remarkably, effective antitumor immunity was maintained and cure became prevalent when polyfunctional CD4+ effector cells were prevented from undergoing PD-1-mediated tolerization, either by antibody blockade of the PD-1-PD-L1 pathway, or targeted ablation of PD-1 in tumors-pecific CD4+ T cells. Our study suggests that tumor-reactive CD4+ T cells act as the "gatekeepers" of the host antitumor immunity in the postchemotherapy setting, thereby their functional status governs the choice between eradication versus regrowth of residual tumors.
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U2 - 10.1182/blood-2011-12-398321
DO - 10.1182/blood-2011-12-398321
M3 - Article
C2 - 22859605
AN - SCOPUS:84866342671
SN - 0006-4971
VL - 120
SP - 2229
EP - 2239
JO - Blood
JF - Blood
IS - 11
ER -