トキタ　ダイスケ   Tokita Daisuke   時田　大輔    所属   医学部 医学科（東京女子医科大学病院）    職種   非常勤講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Regulated compartmentalization of programmed cell death-1 discriminates CD4+CD25+ resting regulatory T cells from activated T cells.
掲載誌名	正式名：Journal of immunology (Baltimore, Md. : 1950) 略　 称：J Immunol ISSNコード：00221767/00221767
掲載区分	国外
巻・号・頁	176(5),pp.2808-16
著者・共著者	Raimondi Giorgio, Shufesky William J, Tokita Daisuke, Morelli Adrian E, Thomson Angus W
発行年月	2006/03
概要	More effective discrimination between CD4+CD25+ regulatory T cells (Treg) and activated T cells would significantly improve the current level of purification of Treg and their therapeutic application. We observed that approximately 90% of Treg (positive for the nuclear transcription factor Forkhead winged helix protein-3 and able to inhibit naive T cell proliferation) isolated from the spleens or lymph nodes of normal mice did not express significant levels of the inhibitory receptor programmed cell death-1 (PD-1) on their surface, but retained PD-1 intracellularly. An identical phenotype was also identified for human CD4+CD25(high) T cells isolated from peripheral blood of healthy volunteers. By contrast, activated T cells expressed high levels of surface PD-1 that paralleled up-regulation of CD25 during effector cell expansion. This distinction allowed us to isolate CD4+CD25+PD-1(-) T cells with suppressive activity from mice immunized with mature allogeneic dendritic cells. Although purification was limited to resting Treg because TCR ligation induced up-regulation of surface PD-1, this strategy nevertheless represents a valuable step toward more definitive characterization of Treg and their improved purification for therapeutic assessment.
DOI	10.4049/jimmunol.176.5.2808
PMID	16493037