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Proteome and cytoskeleton responses in osteosarcoma cells with reduced OXPHOS activity
Johanna Annunen-Rasila1, Steffen Ohlmeier, Hanna Tuokko
1Department of Neurology, University of Oulu, Oulu, Finland.
Proteomics
|May 30, 2007
Summary
Oxidative phosphorylation (OXPHOS) deficiency in osteosarcoma cells causes significant vimentin network collapse and altered mitochondrial distribution. This highlights the link between cellular energy production and cytoskeletal integrity.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Disorganization of the vimentin network has been observed in cells with impaired oxidative phosphorylation (OXPHOS).
- Osteosarcoma cells present a model to study cellular responses to energy metabolism disruption.
Purpose of the Study:
- To investigate cellular responses, specifically cytoskeletal organization and mitochondrial distribution, in osteosarcoma cells experiencing OXPHOS deficiency.
- To analyze proteomic changes associated with OXPHOS deficiency.
Main Methods:
- Inhibition of mitochondrial complex I (CI) and complex IV (CIV) in osteosarcoma cells.
- Generation of mitochondrial DNA-depleted (rho0) osteosarcoma cells.
- Analysis of cytoskeletal organization, mitochondrial distribution, total proteome (2-DE), and vimentin expression (ELISA).
Main Results:
- CIV inhibition and rho0 cells induced vimentin network collapse around the nucleus.
- Mitochondria localized to a perinuclear crescent (CIV inhibition) or accumulated around the nucleus (rho0 cells).
- OXPHOS deficiency altered expression of cytoskeletal proteins, apoptosis regulators, metabolic enzymes, and oxidative stress response proteins.
Conclusions:
- OXPHOS deficiency and associated oxidative stress can induce significant cytoskeletal alterations.
- Vimentin network disorganization is a key cellular response to impaired mitochondrial function.
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