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Critical Reviews™ in Immunology
IF: 1.352 5-Year IF: 3.347 SJR: 0.657 SNIP: 0.55 CiteScore™: 2.19

ISSN Print: 1040-8401
ISSN Online: 2162-6472

Critical Reviews™ in Immunology

DOI: 10.1615/CritRevImmunol.2016018772
pages 239-267

Role of IL-26+CD26+CD4 T Cells in Pulmonary Chronic Graft-Versus-Host Disease and Treatment with Caveolin-1-Ig Fc Conjugate

Kei Ohnuma
Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
Ryo Hatano
Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
Takumi Itoh
Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
Noriaki Iwao
Department of Hematology, Juntendo University Shizuoka Hospital, Nagaoka 1129, Izunokuni-city, Shizuoka 410-2295, Japan
Nam H. Dang
Division of Hematology/Oncology, University of Florida, 1600 SW Archer Road- Box 100278, Room MSB M410A, Gainesville, FL 32610, U.S.A.
Chikao Morimoto
Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan

ABSTRACT

Obliterative bronchiolitis is the primary noninfectious pulmonary complication after allogeneic hematopoietic cell transplantation and the only pathognomonic manifestation of pulmonary chronic graft-versus-host disease (cGVHD). In our recent study, we identified a novel effect of IL-26, which is absent in rodents, on transplant related-obliterative bronchiolitis. Sublethally irradiated NOD/Shi-scidIL2rγnull mice transplanted with human umbilical cord blood gradually exhibited obliterative bronchiolitis with increased collagen deposition and predominant infiltration with human IL-26+CD26+CD4 T cells. Moreover, we showed that IL-26 increased collagen synthesis in fibroblasts in vitro and that collagen contents were increased in a murine GVHD model using IL26 transgenic mice. In vitro analysis demonstrated a significant increase in IL-26 production by CD4 T cells following CD26 costimulation, while immunoglobulin Fc domain fused with the N-terminal of caveolin-1, the ligand for CD26, (Cav-Ig) effectively inhibited production of IL-26. Administration of Cav-Ig before or after onset of GVHD impeded the development of clinical and histologic features of GVHD without interrupting engraftment of donor-derived human cells, with preservation of the graft-versus-leukemia effect. We concluded that cGVHD of the lungs is caused in part by IL-26+CD26+CD4 T cells, and that treatment with Cav-Ig could be beneficial for cGVHD prevention and therapy.


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