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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Nakayama, Keiichi I. Itsumi, Momoe Yoshikai, Yasunobu Oyamada, Akiko Saiwai, Hirokazu Iwamoto, Yukihide Okada, Seiji Iwakura, Yoichiro Shimoda, Kazuya Ikebe, Hiori Yamada, Hisakata |
| Description | Country affiliation: Japan Author Affiliation: Oyamada A ( Division of Host Defense, Department of Orthopedic Surgery, Kyushu University, Fukuoka, Japan.) |
| Abstract | Tyrosine kinase 2 (Tyk2), a member of the JAK family, is involved in IL-12- and IL-23-mediated signaling. In the present study, we examined the roles of Tyk2 in the development of myelin oligodendrocyte glycoprotein (MOG)-induced experimental autoimmune encephalomyelitis (EAE) by using Tyk2 knockout (KO) mice. In vitro differentiation of Th1 but not Th17 cells was severely impaired in Tyk2 KO CD4 T cells, although Tyk2 KO Th17 cells did not respond to IL-23. Tyk2 KO mice showed complete resistance against EAE with no infiltration of CD4 T cells in the spinal cord. Surprisingly, the number of MOG-specific Th17 cells in the periphery was comparable between KO and wild-type (WT) mice, whereas Th1 cells were greatly reduced in Tyk2 KO mice. Adoptive transfer of MOG-primed WT T cells induced EAE in Tyk2 KO recipients, indicating that Tyk2 in the environment was dispensable for the infiltration of effector T cells into the spinal cord. A reduced but significant number of Tyk2 KO T cells were detected in the spinal cord of mice with EAE, which had been reconstituted with bone marrow cells of WT and KO mice. Furthermore, MOG-immunized Tyk2 KO mice developed EAE after adoptive transfer of MOG-primed WT Th1 cells, which might trigger local inflammation that recruits Th17 cells. Taken together, these results indicate that Tyk2 is critically involved in the pathogenic CD4 T cell responses and thus could be a target molecule for the treatment of autoimmune diseases. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| Journal | The Journal of Immunology |
| Issue Number | 11 |
| Volume Number | 183 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2009-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cd4-positive T-lymphocytes Immunology Encephalomyelitis, Autoimmune, Experimental Tyk2 Kinase Adoptive Transfer Animals Cytology Cell Differentiation Cytokines Biosynthesis Genetics Pathology Enzyme-linked Immunosorbent Assay Flow Cytometry Interleukin-17 Mice Mice, Inbred C57bl Mice, Knockout Myelin Proteins Myelin-associated Glycoprotein Myelin-oligodendrocyte Glycoprotein Spinal Cord T-lymphocyte Subsets Metabolism Th1 Cells Research Support, Non-u.s. Gov't Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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