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T cell receptor (TCR) signaling in health and disease

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DOI: 10.1038/s41392-021-00823-w

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  1. Crafoord Foundation
  2. Swedish Cancer Society
  3. Swedish Childhood Cancer Foundation

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Interaction of T cell receptor with MHC-antigenic peptide complex leads to activation of T cell signaling pathways that mediate gene expression. Adaptor proteins act as scaffolds in integrating these pathways to connect different signaling cascades, facilitating full T cell activation.
Interaction of the T cell receptor (TCR) with an MHC-antigenic peptide complex results in changes at the molecular and cellular levels in T cells. The outside environmental cues are translated into various signal transduction pathways within the cell, which mediate the activation of various genes with the help of specific transcription factors. These signaling networks propagate with the help of various effector enzymes, such as kinases, phosphatases, and phospholipases. Integration of these disparate signal transduction pathways is done with the help of adaptor proteins that are non-enzymatic in function and that serve as a scaffold for various protein-protein interactions. This process aids in connecting the proximal to distal signaling pathways, thereby contributing to the full activation of T cells. This review provides a comprehensive snapshot of the various molecules involved in regulating T cell receptor signaling, covering both enzymes and adaptors, and will discuss their role in human disease.

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