title: Neuroimmune semaphorin 4D is necessary for optimal lung allergic inflammation.
abstract: Neuroimmune semaphorin 4D (Sema4D) was found to be expressed and function in the nervous and immune systems. In the immune system, Sema4D is constitutively expressed on T cells and regulates T cell priming. In addition, it displays a stimulatory function on macrophages, DC, NK cells, and neutrophils. As all these cells are deeply involved in asthma pathology, we hypothesized that Sema4D plays a critical non-redundant regulatory role in allergic airway response. To test our hypothesis, we exposed Sema4D(-/-) and WT mice to OVA injections and challenges in the well-defined mouse model of OVA-induced experimental asthma. We observed a significant decrease in eosinophilic airway infiltration in allergen-treated Sema4D(-/-) mice relative to WT mice. This reduced allergic inflammatory response was associated with decreased BAL IL-5, IL-13, TGFβ1, IL-6, and IL-17A levels. In addition, T cell proliferation in OVA₃₂₃₋₃₃₉-restimulated Sema4D(-/-) cell cultures was downregulated. We also found increased Treg numbers in spleens of Sema4D(-/-) mice. However, airway hyperreactivity (AHR) to methacholine challenges was not affected by Sema4D deficiency in either acute or chronic experimental disease setting. Surprisingly, lung DC number and activation were not affected by Sema4D deficiency. These data provide a new insight into Sema4D biology and define Sema4D as an important regulator of Th2-driven lung pathophysiology and as a potential target for a combinatory disease immunotherapy.
authors.affiliation: Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, Baltimore, MD, USA.
authors.forename: K
authors.initials: K
authors.lastname: Shanks
authors.forename: E H
authors.initials: EH
authors.lastname: Nkyimbeng-Takwi
authors.forename: E
authors.initials: E
authors.lastname: Smith
authors.forename: M M
authors.initials: MM
authors.lastname: Lipsky
authors.forename: L J
authors.initials: LJ
authors.lastname: DeTolla
authors.forename: D W
authors.initials: DW
authors.lastname: Scott
authors.forename: A D
authors.initials: AD
authors.lastname: Keegan
authors.forename: S P
authors.initials: SP
authors.lastname: Chapoval
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D001249:Asthma / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry / Q000276:immunology; D049109:Cell Proliferation; D002478:Cells, Cultured; D016207:Cytokines / Q000276:immunology / Q000378:metabolism; D005434:Flow Cytometry; D006801:Humans; D006967:Hypersensitivity / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D008168:Lung / Q000276:immunology* / Q000378:metabolism; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology; D008214:Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010047:Ovalbumin / Q000276:immunology; D011014:Pneumonia / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D011657:Pulmonary Eosinophilia / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D039961:Semaphorins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D018417:Th1 Cells / Q000276:immunology / Q000378:metabolism; D058504:Th17 Cells / Q000276:immunology / Q000378:metabolism; D018418:Th2 Cells / Q000276:immunology / Q000378:metabolism
chemical_list: D015703:Antigens, CD; C093224:CD100 antigen; D016207:Cytokines; D039961:Semaphorins; D010047:Ovalbumin
keywords: Allergen; Asthma; CD72; Experimental models; Knockout mice; Plexin B1; Sema4D/CD100; Th2 cytokines
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