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Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
08:49

Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries

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The role of diacylglycerol kinases in T cell anergy

X P Zhong1, B A Olenchock, G A Koretzky

  • 1Department of Pathology and Laboratory Medicine, Division of Rheumatology, Abramson Family Cancer Research Institute, University of Pennsylvania, 415 BRBII/III, 421 Curie Blvd., 19104 Philadelphia, USA.

Ernst Schering Foundation Symposium Proceedings
|May 31, 2008
PubMed

Insights

Diacylglycerol kinase activity balances T cell receptor signaling by converting diacylglycerol (DAG) into phosphatidic acid. This balance is crucial for determining the fate of stimulated T cells.

Area of Science:

  • Immunology
  • Cellular Signaling
  • Biochemistry

Background:

  • T cell receptor (TCR) engagement activates biochemical cascades essential for T cell response.
  • Activation involves protein tyrosine kinases, adapter proteins, and phospholipase Cgamma1, generating inositol-1,4,5-trisphosphate (IP3) and diacylglycerol (DAG).
  • The balance between IP3 and DAG downstream signals critically influences T cell fate.

Purpose of the Study:

  • To investigate the role of diacylglycerol kinase family members in regulating TCR-mediated signaling.
  • To elucidate how diacylglycerol kinase activity impacts the balance between IP3 and DAG signaling pathways.

Main Methods:

  • Summarized recent data on diacylglycerol kinase activity.
  • Focused on the enzymatic conversion of DAG to phosphatidic acid.

Main Results:

  • Diacylglycerol kinase activity is a key determinant of the IP3/DAG signaling balance.
  • This balance profoundly affects the fate of stimulated T cells.

Conclusions:

  • Diacylglycerol kinases play a critical role in integrating TCR-stimulated signaling pathways.
  • Modulation of diacylglycerol kinase activity represents a potential mechanism for controlling T cell responses.

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