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Updated: Jul 20, 2026

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

Published on: January 22, 2019

ShcA mediates the dominant pathway to extracellular signal-regulated kinase activation during early thymic

Paul Trampont1, Li Zhang, Kodi S Ravichandran

  • 1Carter Immunology Center, MR4-4072D, Box 801386, University of Virginia, Charlottesville, VA 22908, USA.

Molecular and Cellular Biology
|September 20, 2006
PubMed

Insights

The adapter protein ShcA is crucial for ERK activation during thymic beta selection, a key step in T-cell development. This study reveals ShcA

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Thymic T-cell development involves a beta selection checkpoint regulated by pre-T-cell receptor signals.
  • Extracellular signal-regulated kinases (ERK1/ERK2) are involved in this checkpoint, but upstream regulators are unclear.

Purpose of the Study:

  • To investigate the in vivo role of adapter protein ShcA in regulating ERK activation during thymic beta selection.
  • To identify specific ShcA components critical for ERK phosphorylation and thymocyte development.

Main Methods:

  • Utilized genetically modified mice with conditional loss of the shc1 gene or ShcA mutants.
  • Assessed ERK activation in double-negative (DN) thymocytes ex vivo and in vivo.
  • Analyzed thymocyte development in mice expressing mutated ShcA.

Main Results:

  • Adapter protein ShcA accounts for up to 70% of ERK activation in DN thymocytes.
  • Two specific tyrosines on ShcA are identified as critical for in vivo ERK phosphorylation.
  • Mutations in these ShcA tyrosines impair DN thymocyte development.

Conclusions:

  • ShcA plays a dominant role in controlling ERK activation during thymic beta selection.
  • This study provides the first in vivo evidence of ShcA's requirement in this critical T-cell development pathway.

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