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Changes in Lipid Composition During Manganese-Induced Apoptosis in PC12 Cells
P A Corsetto1, G Ferrara2, S Buratta2
1Laboratory of Membrane Biochemistry and Applied Nutrition, Department of Pharmacological and Biomolecular Sciences, University of Milan, Via D. Trentacoste 2, 20134, Milan, Italy.
Neurochemical Research
|December 17, 2015
Summary
Manganese-induced apoptosis in PC12 cells alters cell membrane lipid composition. Key changes include decreases in cholesterol, phosphatidylserine, and phosphatidylethanolamine, with phosphatidylserine reduction preceding apoptosis.
Area of Science:
- Cell Biology
- Biochemistry
- Neuroscience
Background:
- Membrane lipid composition regulates cell signaling pathways and processes like apoptosis.
- Membrane remodeling is an early event in apoptosis signaling and clearance.
- Understanding lipid changes during apoptosis is crucial for cell death research.
Purpose of the Study:
- To investigate changes in phospholipid, cholesterol, and fatty acid content during manganese-induced apoptosis in PC12 cells.
- To analyze lipid composition in both whole cells and detergent-resistant membranes during apoptosis.
Main Methods:
- Apoptosis was induced in PC12 cells using manganese.
- Lipid analysis of whole cells and detergent-resistant membranes was performed using High-Performance Liquid Chromatography/Gas Chromatography (HPLC/GC).
Main Results:
- Apoptosis correlated with decreased cholesterol, phosphatidylserine, and phosphatidylethanolamine in whole cell extracts.
- Reduced phosphatidylserine levels were observed prior to detectable apoptosis.
- Detergent-resistant membranes showed altered phosphatidylinositol, phosphatidylcholine, and sphingomyelin content, but not phosphatidylserine or phosphatidylethanolamine changes.
Conclusions:
- Manganese-induced apoptosis involves significant alterations in cellular lipid profiles.
- Specific lipid changes, particularly phosphatidylserine reduction, may serve as early biomarkers for apoptosis.
- Membrane subdomains (detergent-resistant membranes) exhibit distinct lipid compositional changes during apoptosis compared to whole cells.
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