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Focal adhesion kinase negatively regulates Lck function downstream of the T cell antigen receptor.


ABSTRACT: Focal adhesion kinase (FAK) is a critical regulator of signal transduction in multiple cell types. Although this protein is activated upon TCR engagement, the cellular function that FAK plays in mature human T cells is unknown. By suppressing the function of FAK, we revealed that FAK inhibits TCR-mediated signaling by recruiting C-terminal Src kinase to the membrane and/or receptor complex following TCR activation. Thus, in the absence of FAK, the inhibitory phosphorylation of Lck and/or Fyn is impaired. Together, these data highlight a novel role for FAK as a negative regulator TCR function in human T cells. These results also suggest that changes in FAK expression could modulate sensitivity to TCR stimulation and contribute to the progression of T cell malignancies and autoimmune diseases.

SUBMITTER: Chapman NM 

PROVIDER: S-EPMC3865716 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature

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Focal adhesion kinase negatively regulates Lck function downstream of the T cell antigen receptor.

Chapman Nicole M NM   Connolly Sean F SF   Reinl Erin L EL   Houtman Jon C D JC  

Journal of immunology (Baltimore, Md. : 1950) 20131113 12


Focal adhesion kinase (FAK) is a critical regulator of signal transduction in multiple cell types. Although this protein is activated upon TCR engagement, the cellular function that FAK plays in mature human T cells is unknown. By suppressing the function of FAK, we revealed that FAK inhibits TCR-mediated signaling by recruiting C-terminal Src kinase to the membrane and/or receptor complex following TCR activation. Thus, in the absence of FAK, the inhibitory phosphorylation of Lck and/or Fyn is  ...[more]

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