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Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay
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Numb-dependent integration of pre-TCR and p53 function in T-cell precursor development.

N M Martin-Blanco1, S Checquolo2, F Del Gaudio1

  • 1Department of Molecular Medicine, Sapienza University, 00161 Rome, Italy.

Cell Death & Disease
|October 17, 2014
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Summary

Numb protein

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Immunology

Background:

  • Numb protein plays a critical role in cell fate determination during development.
  • Its function appears to change dynamically, with paradoxical roles in differentiation.
  • Understanding Numb's regulation is key to comprehending developmental processes.

Purpose of the Study:

  • To investigate the regulatory mechanism of Numb protein localization during T-cell development.
  • To elucidate the relationship between Numb shuttling, pre-T-cell receptor signaling, and p53 modulation.
  • To connect Numb's dynamic function to distinct stages of thymocyte differentiation.

Main Methods:

  • Analysis of Numb protein's nuclear localization in thymocyte precursors.
  • Investigating the role of pre-T-cell receptor (pre-TCR) signaling and protein kinase Cθ activation.
  • Assessing the impact of Numb nuclear exclusion on p53 stabilization and downmodulation.

Main Results:

  • Numb nuclear localization is confined to early thymocyte precursors.
  • Pre-TCR signaling and protein kinase Cθ activation induce Numb phosphorylation and nuclear exclusion.
  • Nuclear Numb stabilizes p53, while its exclusion downmodulates p53, facilitating differentiation.

Conclusions:

  • Numb protein shuttles between the nucleus and cytosol, regulating its function during T-cell development.
  • This dynamic regulation couples Numb's distinct roles to specific developmental stages.
  • Numb's nuclear persistence hinders differentiation and promotes precursor cell death.