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Bat3 promotes T cell responses and autoimmunity by repressing Tim-3-mediated cell death and exhaustion.
- Source :
-
Nature Medicine . Sep2012, Vol. 18 Issue 9, p1394-1400. 7p. 1 Diagram, 5 Graphs. - Publication Year :
- 2012
-
Abstract
- T cell immunoglobulin and mucin domain-containing 3 (Tim-3) is an inhibitory receptor that is expressed on exhausted T cells during infection with HIV-1 and hepatitis C virus. By contrast, Tim-3 expression and function are defective in multiple human autoimmune diseases. However, the molecular mechanisms modulating Tim-3 function are not well understood. Here we show that human leukocyte antigen B (HLA-B)-associated transcript 3 (Bat3) binds to, and represses the function of, Tim-3. Bat3 protects T helper type 1 (TH1) cells from galectin-9-mediated cell death and promotes both proliferation and proinflammatory cytokine production. Bat3-deficient T cells have elevated expression of exhaustion-associated molecules such as Tim-3, Lag3, Prdm1 and Pbx3, and Bat3 knockdown in myelin-antigen-specific CD4+ T cells markedly inhibits the development of experimental autoimmune encephalomyelitis while promoting the expansion of a dysfunctional Tim-3hi, interferon-? (IFN-?)loCD4+ cell population. Furthermore, expression of Bat3 is reduced in exhausted Tim-3+ T cells from mouse tumors and HIV-1-infected individuals. These data indicate that Bat3 acts as an inhibitor of Tim-3-dependent exhaustion and cell death. Bat3 may thus represent a viable therapeutic target in autoimmune disorders, chronic infections and cancers. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10788956
- Volume :
- 18
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Nature Medicine
- Publication Type :
- Academic Journal
- Accession number :
- 79781901
- Full Text :
- https://doi.org/10.1038/nm.2871