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Parasporin-2 requires GPI-anchored proteins for the efficient cytocidal action to human hepatoma cells

Sakae Kitada1, Yuichi Abe, Toshitaka Maeda

  • 1Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka 812-8581, Japan. sakae@chem.kyushu-univ.jp

Toxicology
|August 4, 2009
PubMed

Insights

Bacillus thuringiensis protein, Parasporin-2 (PS2), effectively lyses hepatoma cells by interacting with lipid rafts. Glycosylphosphatidylinositol (GPI)-anchored proteins are crucial for PS2

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Parasporin-2 (PS2) is a Bacillus thuringiensis inclusion protein known to interact with human hepatoma cells.
  • The toxin oligomerizes on the cell surface within lipid rafts, inducing cell lysis characterized by blebbing.

Purpose of the Study:

  • To investigate the role of glycosylphosphatidylinositol (GPI)-anchored proteins in the cytocidal activity of PS2.
  • To determine if PS2 utilizes GPI-anchored proteins as receptors for effective cell lysis.

Main Methods:

  • Treatment of hepatoma cells to deplete cellular cholesterol and sphingolipids in lipid rafts.
  • Cleavage of GPI-anchored proteins using phosphatidylinositol-specific phospholipase C.
  • Assessment of PS2 binding and cytolysis following these treatments.
  • Analysis of GPI-anchored protein expression across different cell lines.

Main Results:

  • Depletion of lipid raft components only slightly reduced PS2-induced cytolysis.
  • Cleavage of GPI-anchored proteins significantly reduced PS2 binding and conferred temporal resistance to cytolysis.
  • While aerolysin uses GPI-anchored proteins as receptors, PS2 showed distinct cytocidal specificity despite even GPI-anchored protein expression across cell lines.

Conclusions:

  • GPI-anchored proteins are essential for the effective cytolysis of hepatoma cells by PS2.
  • PS2 requires specific GPI-anchored proteins for its potent cytotoxic action, distinct from aerolysin's mechanism.

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