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Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
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Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules

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Syk Is Recruited to Stress Granules and Promotes Their Clearance through Autophagy

Mariya O Krisenko1, Reneé L Higgins1, Soumitra Ghosh1

  • 1From the Department of Medicinal Chemistry and Molecular Pharmacology and the Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907.

The Journal of Biological Chemistry
|October 3, 2015
PubMed

Insights

Spleen tyrosine kinase (Syk) is recruited to cellular stress granules, promoting cell survival. This process involves Syk phosphorylation and interactions with Grb7, aiding in stress granule clearance via autophagy.

Area of Science:

  • Cell Biology
  • Immunology
  • Cancer Biology

Background:

  • Spleen tyrosine kinase (Syk) is crucial for immune responses.
  • Syk also plays a context-dependent role in cancer cell growth.
  • Syk interacts with proteins found in stress granules.

Purpose of the Study:

  • To investigate the role of Syk in cellular stress granules.
  • To identify mechanisms of Syk recruitment to stress granules.
  • To understand how Syk influences cellular stress response and survival.

Main Methods:

  • Proteomic analysis to identify Syk-binding proteins.
  • Cellular treatments with stress granule inducers.
  • Phosphorylation site analysis of Syk.
  • Immunofluorescence and autophagy assays.

Main Results:

  • Syk is recruited to stress granules upon cellular stress.
  • Syk recruitment requires tyrosine phosphorylation and involves Grb7.
  • Recruited Syk phosphorylates nearby proteins and promotes autophagosome formation.
  • Stress granule clearance and enhanced cell survival are observed.

Conclusions:

  • Syk plays a novel role in the cellular stress response.
  • Syk's localization to stress granules is a regulated process.
  • Syk contributes to cell survival by facilitating stress granule resolution through autophagy.
Keywords:
Grb7Sykautophagycancer biologysignal transductionstress granuletyrosine-protein kinase (tyrosine kinase)

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