title: AILIM/ICOS signaling induces T-cell migration/polarization of memory/effector T-cells.
abstract: AILIM/ICOS has critical roles in the regulation of T-cell differentiation and effector T-cell function in various immune responses. The counter-ligand for AILIM/ICOS, B7h, is widely expressed in not only lymphoid tissue and antigen-presenting cells, but also in fibroblast and endothelial cells in various organs. Here, we demonstrate that activated human T-cells migrate beneath TNF-alpha-treated HUVEC and display morphological polarization via AILIM/ICOS signaling. AILIM/ICOS stimulation, in the absence of antigen stimulation, also induced T-cell polarization. Importantly, AILIM/ICOS-mediated polarization was evident in CD4+CD45RO+ memory T-cells and generated Th1 cells, but not in CD4+CD45RA+ naive T-cells and generated Th2 cells. Furthermore, AILIM/ICOS signaling is involved in transendothelial migration of Th1 cells, but not Th2 cells. Our data suggest that AILIM/ICOS-B7h interactions play an important role in the endothelium in controlling the entry of memory/effector T-cells into inflamed tissues in the periphery.
authors.affiliation: Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Research Institute of Biological Science, Tokyo University of Science, Yamazaki 2641, Noda, Chiba, 278-8510, Japan.
authors.forename: Naokazu
authors.initials: N
authors.lastname: Okamoto
authors.forename: Yuko
authors.initials: Y
authors.lastname: Nukada
authors.forename: Katsunari
authors.initials: K
authors.lastname: Tezuka
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Ohashi
authors.forename: Kensaku
authors.initials: K
authors.lastname: Mizuno
authors.forename: Takashi
authors.initials: T
authors.lastname: Tsuji
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte; D002454:Cell Differentiation / Q000276:immunology; D002465:Cell Movement / Q000276:immunology*; D016764:Cell Polarity; D002478:Cells, Cultured; D018920:Coculture Techniques; D042783:Endothelial Cells / Q000276:immunology / Q000378:metabolism; D006801:Humans; D060889:Inducible T-Cell Co-Stimulator Protein; D008213:Lymphocyte Activation / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000276:immunology*; D018417:Th1 Cells / Q000166:cytology / Q000276:immunology*; D018418:Th2 Cells / Q000166:cytology / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; C556692:ICOS protein, human; D060889:Inducible T-Cell Co-Stimulator Protein