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Related Concept Videos

Loss of Tumor Suppressor Gene Functions01:12

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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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Cancer-Critical Genes II: Tumor Suppressor Genes01:05

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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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T-cell intracellular antigens function as tumor suppressor genes.

C Sánchez-Jiménez1, M D Ludeña2, J M Izquierdo1

  • 1Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid (CSIC/UAM), C/ Nicolás Cabrera 1, Madrid, Spain.

Cell Death & Disease
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T-cell intracellular antigen (TIA) proteins TIA1 and TIAR act as tumor suppressors. Increased expression of TIA1 or TIAR inhibits cell proliferation and xenotumor growth, suggesting their therapeutic potential.

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Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Knockdown of T-cell intracellular antigens TIA1 and TIAR promotes tumor growth.
  • The precise role of TIA1 and TIAR in cancer development requires further elucidation.

Purpose of the Study:

  • To investigate the function of TIA1 and TIAR in cell proliferation and tumor growth.
  • To explore the underlying molecular mechanisms of TIA protein-mediated tumor suppression.

Main Methods:

  • Utilized a tetracycline-inducible system for controlled expression of TIA1 and TIAR in 293 cells.
  • Performed genome-wide profiling to analyze gene expression changes.
  • Assessed cell proliferation, cell cycle, apoptosis, and autophagy.
  • Evaluated xenotumor growth in nude mice models.
  • Correlated TIA1 and TIAR expression with patient prognosis in lung squamous cell carcinoma.

Main Results:

  • Increased TIA1 or TIAR expression reduced cell proliferation and induced G1/S cell cycle arrest.
  • Ectopic TIA expression led to apoptosis and autophagy, and repressed global translation via phospho-eukaryotic initiation factor 2 alpha.
  • Genome-wide profiling revealed upregulation of p53 signaling pathway genes.
  • TIA1/TIAR expression inhibited xenotumor growth in vivo.
  • Low TIA1/TIAR expression correlated with poor prognosis in lung cancer patients.

Conclusions:

  • TIA proteins function as tumor suppressors by inhibiting cell proliferation and promoting cell death.
  • TIA proteins regulate splicing, translation, and p53 signaling pathways.
  • TIA1 and TIAR represent potential therapeutic targets for cancer treatment.