title: Cutting edge: MHC class II expression by pulmonary nonhematopoietic cells plays a critical role in controlling local inflammatory responses.
abstract: The interaction of CD4(+) T cells with MHC class II (MHCII)-expressing hematopoietic APCs plays a critical role in both the generation of protective immune responses and maintenance of tolerance in the lung. The functional significance of MHCII expression by nonhematopoietic stromal cells, however, has not been defined in vivo. Using a novel mouse model of orthotopic left lung transplantation, we demonstrate that selective elimination of MHCII expression on nonhematopoietic cells leads to an inflammatory response as a result of reduced peripheral generation of regulatory CD4(+) T cells. Absence of MHCII expression on nonhematopoietic cells also inhibits local growth of metastatic pulmonary tumor. These findings indicate that nonhematopoietic cells play a previously unrecognized role in downregulating inflammatory responses in nonlymphoid tissues.
authors.affiliation: Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Kreisel
authors.forename: Steven B
authors.initials: SB
authors.lastname: Richardson
authors.forename: Wenjun
authors.initials: W
authors.lastname: Li
authors.forename: Xue
authors.initials: X
authors.lastname: Lin
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Kornfeld
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Sugimoto
authors.forename: Chyi-Song
authors.initials: CS
authors.lastname: Hsieh
authors.forename: Andrew E
authors.initials: AE
authors.lastname: Gelman
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Krupnick
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D017951:Antigen Presentation / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D002469:Cell Separation; D042783:Endothelial Cells / Q000276:immunology* / Q000378:metabolism; D004847:Epithelial Cells / Q000276:immunology* / Q000378:metabolism; D005434:Flow Cytometry; D000949:Histocompatibility Antigens Class II / Q000276:immunology* / Q000378:metabolism; D007249:Inflammation / Q000276:immunology* / Q000378:metabolism; D016040:Lung Transplantation / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D017154:Stromal Cells / Q000276:immunology / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000276:immunology / Q000378:metabolism
chemical_list: D000949:Histocompatibility Antigens Class II
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