title: Spleen Tyrosine Kinase Modulates Fibrous Airway Obliteration and Associated Lymphoid Neogenesis After Transplantation.
abstract: Chronic lung allograft dysfunction, the major cause of death following lung transplantation, usually manifests as irreversible airflow obstruction associated with obliterative bronchiolitis (OB), a lesion characterized by chronic inflammation, lymphoid neogenesis, fibroproliferation and small airway obliteration. Spleen tyrosine kinase (Syk), a tyrosine kinase that regulates B cell function and innate immunity, has been implicated in the pathogenesis of chronic inflammation and tissue repair. This study evaluated the role of Syk in development of OB, using an intrapulmonary tracheal transplant model of OB with the conditional Syk-knockout Syk(flox/flox) //rosa26-CreER(T2) mice and a Syk-selective inhibitor, GSK2230413. BALB/c trachea allografts were transplanted into Syk-knockout (Syk(del/del) ) mice or wild-type C57BL/6 recipients treated with GSK2230413. At day 28, histological analysis revealed that in the Syk(del/del) and GSK2230413-treated C57BL/6 recipients, the graft lumen remained open compared with allografts transplanted into Syk-expressing (Syk(flox/flox) ) and placebo control-treated C57BL/6 recipients. Immunofluorescence showed lymphoid neogenesis with distinct B and T cell zones in control mice. In contrast, lymphoid neogenesis was absent and few B or T cells were found in Syk(del/del) and GSK2230413-treated mice. These observations suggest that inhibition of Syk may be a potential therapeutic strategy for the management of OB following lung transplantation.
authors: The Toronto Lung Transplant Program, University of Toronto, Toronto, Canada.|Latner Thoracic Surgery Laboratories, Division of Thoracic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.
authors: Y
authors: Y
authors: Matsuda
authors: Division of Respirology, Department of Medicine, University Health Network, University of Toronto, Toronto, Canada.
authors: X
authors: X
authors: Wang
authors: The Toronto Lung Transplant Program, University of Toronto, Toronto, Canada.|Latner Thoracic Surgery Laboratories, Division of Thoracic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.
authors: H
authors: H
authors: Oishi
authors: Latner Thoracic Surgery Laboratories, Division of Thoracic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.
authors: Z
authors: Z
authors: Guan
authors: The Toronto Lung Transplant Program, University of Toronto, Toronto, Canada.|Latner Thoracic Surgery Laboratories, Division of Thoracic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.
authors: M
authors: M
authors: Saito
authors: Latner Thoracic Surgery Laboratories, Division of Thoracic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.
authors: M
authors: M
authors: Liu
authors: The Toronto Lung Transplant Program, University of Toronto, Toronto, Canada.|Latner Thoracic Surgery Laboratories, Division of Thoracic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.
authors: S
authors: S
authors: Keshavjee
authors: The Toronto Lung Transplant Program, University of Toronto, Toronto, Canada.|Division of Respirology, Department of Medicine, University Health Network, University of Toronto, Toronto, Canada.
authors: C-W
authors: CW
authors: Chow
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D015153:Blotting, Western; D001989:Bronchiolitis Obliterans / Q000209:etiology*; D002478:Cells, Cultured; D005355:Fibrosis / Q000209:etiology / Q000473:pathology; D005434:Flow Cytometry; D006084:Graft Rejection / Q000276:immunology*; D006085:Graft Survival / Q000276:immunology; D007113:Immunity, Innate / Q000276:immunology; D007124:Immunoenzyme Techniques; D047908:Intracellular Signaling Peptides and Proteins / Q000502:physiology*; D016040:Lung Transplantation / Q000009:adverse effects*; D008221:Lymphoid Tissue / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D011183:Postoperative Complications; D011505:Protein-Tyrosine Kinases / Q000502:physiology*; D012333:RNA, Messenger / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000201:enzymology* / Q000276:immunology; D000072377:Syk Kinase; D013601:T-Lymphocytes / Q000276:immunology; D014132:Trachea / Q000637:transplantation; D014184:Transplantation, Homologous
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D011505:Protein-Tyrosine Kinases; D000072377:Syk Kinase; C000606897:Syk protein, mouse