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Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry
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Senescent cells communicate via intercellular protein transfer.

Anat Biran1, Meirav Perelmutter1, Hilah Gal1

  • 1Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel;

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Summary
This summary is machine-generated.

Senescent cells communicate by directly transferring proteins to neighboring cells, enhancing immune surveillance by natural killer (NK) cells. This novel mechanism impacts aging and tumorigenesis.

Keywords:
actin polymerizationcellular senescencecytoplasmic bridgesnatural killer cells

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Area of Science:

  • Cell Biology
  • Immunology
  • Aging Research

Background:

  • Cellular senescence is a stress response limiting tumorigenesis but can promote aging.
  • Senescent cells secrete soluble factors influencing their microenvironment.
  • The mechanisms by which senescent cells communicate beyond soluble factors are largely unknown.

Purpose of the Study:

  • To investigate novel mechanisms of intercellular communication by senescent cells.
  • To determine if senescent cells transfer proteins to neighboring cells.
  • To elucidate the role of this transfer in immune surveillance and aging.

Main Methods:

  • Proteomic analysis of transferred proteins.
  • Functional studies of protein transfer.
  • Investigation of cell-cell contact and actin polymerization dependence.
  • Analysis in murine preneoplastic pancreas models.

Main Results:

  • Senescent cells directly transfer proteins to neighboring cells, including NK and T cells.
  • Protein transfer is increased in senescent cells within the murine preneoplastic pancreas.
  • The process is dependent on cell-cell contact and CDC42-regulated actin polymerization.
  • Cytoplasmic bridges partially mediate protein transfer.

Conclusions:

  • Senescent cells utilize direct protein transfer as a novel mode of intercellular communication.
  • This mechanism facilitates immune surveillance of senescent cells by NK cells.
  • Direct protein transfer by senescent cells may influence aging and tumorigenesis.