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Copper induces apoptosis in Aedes C6/36 cells
H Raes1, B P Braeckman, G R Criel
1Department of Biology, University of Gent, B-9000 Gent, Belgium. Hilda.Raes@rug.ac.be
The Journal of Experimental Zoology
|December 22, 1999
Summary
Copper (Cu2+) exposure induces apoptosis in Aedes albopictus insect cells, a novel finding. This heavy metal also causes cell aggregation and hyperpolymerization of microtubules, with cell death occurring via necrosis at higher concentrations.
Area of Science:
- Environmental toxicology
- Cell biology
- Insect molecular biology
Background:
- The Aedes albopictus C6/36 cell line serves as a model for studying heavy metal impacts on insect cells.
- Previous research has shown effects of cadmium (Cd2+) and mercury (Hg2+) on insect cells.
Purpose of the Study:
- To investigate the effects of copper (Cu2+) on Aedes albopictus C6/36 cells.
- To characterize the mechanism of cell death induced by Cu2+.
Main Methods:
- Exposure of C6/36 cells to varying concentrations of Cu2+.
- Assessment of microtubule polymerization, cell aggregation, and cell death.
- Apoptosis confirmation using fluorescence microscopy, electron microscopy, and agarose gel electrophoresis.
- Determination of LC50 using a membrane integrity test.
Main Results:
- Cu2+ induces microtubule hyperpolymerization, cell aggregation, and apoptosis in a cell density-dependent manner.
- Apoptosis is maximal between 0.75 and 1 mM Cu2+, just below the LC50.
- At higher Cu2+ concentrations, cell death occurs via necrosis.
- Apoptosis was observed starting at 18 hours and plateauing at 70-80% by 42 hours of exposure to 0.75 mM Cu2+.
Conclusions:
- This study provides the first report of Cu2+-induced apoptosis in insect cells.
- Cu2+ induces apoptosis and necrosis in Aedes albopictus cells through distinct mechanisms.
- The findings contribute to understanding heavy metal toxicity in insects and provide a basis for further research into induction mechanisms.