西亚试剂：Regulation of a Late Phase of T Cell Polarity and Effector

Regulation of a Late Phase of T Cell Polarity and Effector Functions by Crtam

Jung-Hua Yeh, Sachdev S. Sidhu, and Andrew C. Chan,

Summary

Spatial organization of cellular proteins plays an important role in establishment of cellular polarity to regulate cell division, differentiation, migration, and organogenesis. Activation of T cells by antigen-presenting cells (APCs) results in the formation of an immunological synapse (IS), assembly of a signaling scaffold at the T cell receptor (TCR) contact, cytoskeletal reorganization, and generation of second messengers within the first hours following intercellular contact. We demonstrate here that Crtam (class-I MHC-restricted T-cell associated molecule), an immunoglobulin-superfamily transmembrane protein, coordinates a signaling complex anchored by the Scrib polarity protein to establish a later phase of T cell polarity on a subset of CD4+ T cells >6 hours following activation. Maintenance of this late cellular polarity results in the ability of CD4+Crtam+ T cells to selectively produce more IFNγ and IL22. Crtam engagement thus modulates signals many hours beyond the initial activation event and dynamically influences the adaptive immune response.

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