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Melittin-induced membrane permeability: a nonosmotic mechanism of cell death

Juan Pablo Pratt1, Dino J Ravnic, Harold T Huss

  • 1Laboratory of Immunophysiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.

In Vitro Cellular & Developmental Biology. Animal
|February 2, 2006
PubMed

Insights

Melittin, a bee venom peptide, kills lymphocytes via a "leaky patch" mechanism, not by causing cells to swell. This membrane damage is independent of colloid-osmotic effects.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Toxicology

Background:

  • Melittin, a peptide from honeybees, is known to be toxic to mammalian cells.
  • The exact mechanism of melittin-induced cell death, particularly its role in colloid-osmotic effects, requires further investigation.

Purpose of the Study:

  • To investigate the contribution of colloid-osmotic effects to melittin-induced lymphocyte death.
  • To elucidate the mechanism of melittin's action on lymphocyte membrane permeability and cell volume.

Main Methods:

  • Electrical-impedance cytometry to measure cell volume changes.
  • Streaming video microscopy to observe real-time cellular morphology.
  • Real-time multiparameter flow cytometry to assess membrane integrity and cytoplasmic leakage.
  • Transmission-electron microscopy for ultrastructural analysis of cell membranes.

Main Results:

  • Melittin induced membrane permeability marker release without total cell lysis.
  • No significant changes in lymphocyte cell volume were observed, despite alterations in red blood cell volume.
  • Microscopy revealed cell flattening and membrane discontinuities, not swelling.
  • Flow cytometry confirmed cytoplasmic marker loss and DNA dye uptake, indicating cell death, without changes in forward light scatter.

Conclusions:

  • Melittin induces lymphocyte death through a "leaky patch" mechanism.
  • This mechanism involves direct membrane damage and is independent of colloid-osmotic effects.
  • Melittin's toxicity is primarily due to direct membrane attack rather than cell swelling.

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