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Class IV semaphorin Sema4A enhances T-cell activation and interacts with Tim-2

Abstract

Semaphorins are a family of phylogenetically conserved soluble and transmembrane proteins1,2. Although many soluble semaphorins deliver guidance cues to migrating axons during neuronal development3,4,5, some members are involved in immune responses6,7,8,9. For example, CD100 (also known as Sema4D), a class IV transmembrane semaphorin, signals through CD72 to effect nonredundant roles in immune responses7,10,11,12,13 in a ligand–receptor system that is distinct from any seen previously in the nervous system14,15. Here we report that the class IV semaphorin Sema4A, which is expressed in dendritic cells and B cells, enhances the in vitro activation and differentiation of T cells and the in vivo generation of antigen-specific T cells. Treating mice with monoclonal antibodies against Sema4A blocks the development of an experimental autoimmune encephalomyelitis that is induced by an antigenic peptide derived from myelin oligodendrocyte glycoprotein. In addition, expression cloning shows that the Sema4A receptor is Tim-2, a member of the family of T-cell immunoglobulin domain and mucin domain (Tim) proteins that is expressed on activated T cells.

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Figure 1: Analysis of Sema4A expression.
Figure 2: Sema4A enhances T-cell activation.
Figure 3: Sema4A is involved in T-cell activation in vivo.
Figure 4: Tim-2 is a receptor for Sema4A.

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Acknowledgements

We thank K. Kubota for secretarial assistance; E. L. Barsoumian for critically reading the manuscript; and K. Nakamura, K. Shiozaki, S. Koga and J. Fujikake for technical support. This study was supported by research grants from the Ministry of Education, Culture, Science and Technology of Japan to H.K. and A.K.

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Correspondence to Hitoshi Kikutani.

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Kumanogoh, A., Marukawa, S., Suzuki, K. et al. Class IV semaphorin Sema4A enhances T-cell activation and interacts with Tim-2. Nature 419, 629–633 (2002). https://doi.org/10.1038/nature01037

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