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Related Experiment Videos

Apoptosis-linked gene 2-deficient mice exhibit normal T-cell development and function.

Ihn Kyung Jang1, Renju Hu, Emanuela Lacaná

  • 1Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852, USA.

Molecular and Cellular Biology
|May 25, 2002
PubMed
Summary

The apoptosis-linked gene ALG-2 is not essential for T-cell apoptosis. ALG-2 deficient mice show normal development and immune function, indicating functional redundancy in apoptotic pathways.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The apoptosis-linked gene (ALG-2) is an intracellular Ca(2+)-binding protein involved in programmed cell death.
  • ALG-2 is implicated in apoptotic pathways regulated by T-cell receptor (TCR), Fas, and glucocorticoid signaling.

Purpose of the Study:

  • To investigate the physiological role of ALG-2 in T-cell development and function.
  • To determine if ALG-2 is essential for apoptosis induced by TCR, Fas, or glucocorticoid signals.

Main Methods:

  • Generation of alg-2 null mutant mice.
  • Assessment of T-cell development and immune function in mutant mice.
  • Analysis of apoptotic responses in ALG-2-deficient T cells.

Main Results:

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  • alg-2 null mutant mice were viable, fertile, and exhibited no gross abnormalities or immune dysfunction.
  • ALG-2 deficiency did not prevent apoptosis induced by TCR, Fas, or dexamethasone.
  • T cells lacking ALG-2 responded normally to apoptotic stimuli.

Conclusions:

  • ALG-2 is physiologically dispensable for T-cell apoptosis mediated by TCR, Fas, and glucocorticoid signaling.
  • The findings suggest the existence of functionally redundant proteins compensating for ALG-2's absence in mammalian cells.