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Cationic lipids destabilize lysosomal membrane in vitro

R Wattiaux1, M Jadot, M T Warnier-Pirotte

  • 1Laboratoire de Chimie Physiologique, Facultés Universitaires Notre-Dame de la Paix, Namur, Belgium. Robert_Wattiaux@fundp.ac.be

FEBS Letters
|December 12, 1997
PubMed
Summary

Cationic lipids like DOTAP destabilize lysosomal membranes, increasing enzyme release. This membrane destabilization, crucial for gene delivery, is pH-dependent and can be mitigated by anionic compounds.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Cationic lipids enhance plasmid DNA transfection efficiency.
  • The precise mechanism of enhanced transfection remains unclear.
  • A proposed mechanism involves destabilization of cellular membranes.

Purpose of the Study:

  • To investigate the effect of the cationic lipid DOTAP on lysosomal membrane integrity.
  • To determine if DOTAP destabilizes rat liver lysosomes.

Main Methods:

  • Lysosomes were isolated from rat liver.
  • The latency of beta-galactosidase, a lysosomal enzyme, was measured.
  • Incubation with varying concentrations of DOTAP and different pH conditions were employed.

Main Results:

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  • Low concentrations of DOTAP significantly increased free beta-galactosidase activity and enzyme release.
  • DOTAP treatment deeply destabilized the lysosomal membrane.
  • The destabilization effect was pH-dependent, being less pronounced at pH 5 than at pH 7.4.

Conclusions:

  • Cationic lipids, exemplified by DOTAP, destabilize lysosomal membranes.
  • This destabilization facilitates the release of intralysosomal contents.
  • Interaction between cationic liposomes and anionic membrane lipids may cause membrane fusion and organelle destabilization.