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Cationic liposomes induce macrophage apoptosis through mitochondrial pathway.
Y Aramaki1, S Takano, S Tsuchiya
1School of Pharmacy, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan. aramaki@ps.toyaku.ac.jp
Archives of Biochemistry and Biophysics
|August 8, 2001
Summary
Cationic liposomes trigger apoptosis in macrophage cells via the mitochondrial pathway. Reactive oxygen species (ROS) generation is essential for this cell death process, involving mitochondrial membrane depolarization and cytochrome c release.
Area of Science:
- Cell Biology
- Biochemistry
- Toxicology
Background:
- Cationic liposomes are widely used in drug delivery systems.
- Understanding the mechanisms of liposome-induced cell death is crucial for safety assessment.
Purpose of the Study:
- To elucidate the mechanism of apoptosis induced by stearylamine-containing cationic liposomes (SA-liposomes) in RAW264.7 macrophage cells.
- To investigate the role of mitochondria and reactive oxygen species (ROS) in SA-liposome-induced apoptosis.
Main Methods:
- Treatment of RAW264.7 cells with SA-liposomes.
- Measurement of mitochondrial membrane potential.
- Analysis of cytochrome c release.
- Assessment of Caspase-3 activation.
- Evaluation of ROS generation using N-acetylcysteine.
Main Results:
- SA-liposomes induced mitochondrial membrane depolarization and cytochrome c release.
- SA-liposome treatment led to Caspase-3 activation.
- N-acetylcysteine pretreatment protected cells against SA-liposome-induced apoptosis, indicating the involvement of ROS.
Conclusions:
- SA-liposomes induce apoptosis in RAW264.7 cells through the mitochondrial pathway.
- ROS generation is a critical mediator of SA-liposome-induced apoptosis.