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Journal Article
Research Support, Non-U.S. Gov't
A role for the TIM-3/GAL-9/BAT3 pathway in determining the clinical phenotype of multiple sclerosis.
FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology 2014 November
T-cell immunoglobulin and mucin domain 3 (Tim-3) ligates galectin-9 (Gal-9); this process, resulting in the inhibition of Th1 responses and in the apoptosis of antigen-specific cells, is hampered by binding of the molecular adaptor human leukocyte antigen B (HLA-B)-associated transcript 3 (Bat3) to the intracellular tail of Tim-3. Apoptosis of myelin basic protein (MBP)-specific T lymphocytes correlates with reduced rates of disease progression in multiple sclerosis (MS). We extensively analyzed the Tim-3/Gal-9/Bat3 pathway in 87 patients with a diagnosis of stable relapsing-remitting MS (RRMS), primary progressive MS (PPMS), or benign MS (BEMS), as well as in 40 healthy control (HC) subjects. Results showed that MBP-specific CD4(+)Tim-3(+), CD4(+)/Gal-9(+), and CD4(+)/Tim-3(+)/AV(+) (apoptotic) T lymphocytes were augmented in the BEMS group, whereas CD4(+)/Bat3(+) and CD8(+)/Bat3(+) T lymphocytes were increased and CD4(+)/Tim-3(+)/AV(+) T cells were reduced in the PPMS group (>2 fold and P<0.05 in all cases). Blocking the Tim-3/Gal-9 interaction with specific mAb reduced T-lymphocyte apoptosis and augmented production of IFNγ and IL-17 in the BEMS, RRMS, and HC groups, but not in the PPMS group. The Tim-3/Gal-9 interaction favors apoptosis of MBP-specific T lymphocytes in BEMS; this process is reduced in PPMS by the up-regulation of Bat3. Therapeutic interventions aimed at silencing Bat3 could be beneficial in MS.
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