The Journal of Experimental Medicine
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Published online 26 September 2005 doi:10.1084/jem.20050940
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 202, Number 7, 885-891
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BRIEF DEFINITIVE REPORT

Treatment of advanced tumors with agonistic anti-GITR mAb and its effects on tumor-infiltrating Foxp3+CD25+CD4+ regulatory T cells

Kuibeom Ko1,2, Sayuri Yamazaki1, Kyoko Nakamura1, Tomohisa Nishioka1, Keiji Hirota1, Tomoyuki Yamaguchi1, Jun Shimizu3, Takashi Nomura1, Tsutomu Chiba2, and Shimon Sakaguchi1,4

1 Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University
2 Department of Gastroenterology, Kyoto University Hospital, Kyoto 606-8507, Japan
3 National Institute for Longevity Sciences, National Center for Geriatrics and Gerontology, Aichi 474-8522, Japan
4 Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency Kawaguchi 332-0012, Japan

CORRESPONDENCE Shimon Sakaguchi: shimon{at}frontier.kyoto-u.ac.jp

T cell stimulation via glucocorticoid-induced tumor necrosis factor receptor family–related protein (GITR) can evoke effective tumor immunity. A single administration of agonistic anti-GITR monoclonal antibody (mAb) to tumor-bearing mice intravenously or directly into tumors provoked potent tumor-specific immunity and eradicated established tumors without eliciting overt autoimmune disease. A large number of CD4+ and CD8+ T cells, including interferon (IFN)-{gamma}–secreting cells, infiltrated regressing tumors. Tumor-specific IFN-{gamma}–secreting CD4+ and CD8+ T cells also increased in the spleen. The treatment led to tumor rejection in IFN-{gamma}–intact mice but not IFN-{gamma}–deficient mice. Furthermore, coadministration of anti-GITR and anti–CTLA-4 mAbs had a synergistic effect, leading to eradication of more advanced tumors. In contrast, coadministration of anti-CD25 and anti-GITR mAbs was less effective than anti-GITR treatment alone, because anti-CD25 depleted both CD25+-activated effector T cells and CD25+CD4+ naturally occurring regulatory T (T reg) cells. Importantly, CD4+ T cells expressing the T reg–specific transcription factor Foxp3 predominantly infiltrated growing tumors in control mice, indicating that tumor-infiltrating natural Foxp3+CD25+CD4+ T reg cells may hamper the development of effective tumor immunity. Taken together, T cell stimulation through GITR attenuates T reg–mediated suppression or enhances tumor-killing by CD4+ and CD8+ effector T cells, including those secreting IFN-{gamma}, or both. Agonistic anti-GITR mAb is therefore instrumental in treating advanced cancers.



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