医学会誌 第41巻 補遺号

87/90

results indicate that tissue stiffness cannot be solely determined by the stiffness of the cells that constitute the tissue. Taken together, our method profiles the stiffness of living tissue and cells with defined characteristics and can therefore be utilized to further understand the role of stiffness as a physical factor that determines cell fate during the formation of the cerebral cortex and other tissues.平成27年度川崎医学会賞　研究奨励賞：呼吸器内科学　黒瀬　浩史受賞対象論文：Increase in Activated Treg in TIL in Lung Cancer and In Vitro Depletion of Treg by ADCC Using an Antihuman CCR4 mAb （KM2760）KUROSE K, Ohue Y, Sato E, Yamauchi A, Eikawa S, Isobe M, Nishio Y, Uenaka A, Oka M, Nakayama EJournal of Thoracic Oncology 10: 74-83, 2015ABSTRACT：Introduction: Tregs infiltrate tumors and inhibit immune responses against them.Methods: We investigated subpopulations of Foxp3+ CD4 T cells previously defined by Miyara et al. (Immunity 30, 899-911, 2009) in peripheral blood mononuclear cells (PBMCs) and tumor infiltrating lymphocytes (TILs) in lung cancer. We also showed that Tregs in healthy donors that express CCR4 could be efficiently eliminated in vitro by cotreatment with antihuman (h) CCR4 mAb (KM2760) and NK cells.Results: In lung cancer, the number of activated/effector Tregs and non-Tregs, but not resting/naive Tregs, was increased in TILs compared with the number of those cells in PBMCs. The non-Treg population contained Th2 and Th17. CCR4 expression on activated/effector Tregs and non-Tregs in TILs was down-regulated compared with that on those cells in PBMCs. Chemokinetic migration of CD25+ CD4 T cells containing the Treg population sorted from the PBMCs of healthy donors to CCL22/MDC was abrogated by pretreatment with anti-hCCR4 mAb (KM2760). The inhibitory activity of CD25+ CD127 dim/－CD4 Tregs on the proliferative response of CD4 and CD8 T cells stimulated with anti-CD3/CD28 coated beads was abrogated by adding an anti-hCCR4 mAb (KM2760) and CD56+ NK cells to the culture.Conclusions: The findings suggested the CCR4 on activated/effector Tregs and non-Tregs was functionally involved in the chemokinetic migration and accumulation of those cells to the tumor site. In vitro findings of efficient elimination of Tregs may give the basis for implementation of a clinical trial to investigate Treg depletion by administration of an anti-hCCR4 mAb to solid cancer patients.S83

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