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Updated: Aug 10, 2026
Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
Published on: March 23, 2015
Mitochondrial impairment and recovery after heat shock treatment in a human microglial cell line
F M de Gannes1, N Leducq, P Diolez
1RMSB, UAMR 5536, CNRS-Université Victor Segalen Bordeaux2, France.
Abstract:
The application of a heat shock on the human microglial cell line (CHME 5) has been shown to cause cytoskeleton modifications and alterations in phosphorylated metabolite content (Macouillard-Poulletier de Gannes et al., 1998a Metabolic and cellular characterization of immortalized human microglial cells under heat stress. Neurochem. Int. 33, 61-73). In this study, we focused on the possible involvement of mitochondria in this heat stress response. The cell respiratory properties were followed during the recovering period and the possible relationships between mitochondria and the cytoskeleton were studied. We observed that the heat shock induced changes in mitochondrial activity due to protein denaturation, rather than mitochondrial loss. Furthermore, these alterations were correlated with cytoskeleton disorganization since vimentine, tubuline and mitochondria shift, simultaneously, to a perinuclear location. The perturbations of the mitochondrial distribution persisted until cytoskeleton networks had recovered. Nevertheless, the respiratory properties recovered rapidly suggesting a renaturation of mitochondrial proteins in connection with mitochondrial cytoplasmic redistribution.
Insights
Heat shock disrupts human microglial cell cytoskeleton and mitochondrial function by causing protein denaturation. Mitochondrial redistribution correlates with cytoskeleton disorganization, persisting until network recovery.
Area of Science:
- Cellular biology
- Neuroscience
- Mitochondrial research
Background:
- Heat shock induces cytoskeleton modifications and altered metabolite content in human microglial cells (CHME 5).
- Previous research highlights metabolic and cellular changes in microglial cells under heat stress.
Purpose of the Study:
- To investigate the role of mitochondria in the heat stress response of human microglial cells.
- To explore the relationship between mitochondria and the cytoskeleton following heat shock.
Main Methods:
- Monitoring cellular respiratory properties during the recovery period after heat shock.
- Analyzing the correlation between mitochondrial activity and cytoskeleton organization.
- Observing the subcellular localization of mitochondria, vimentin, and tubulin.
Main Results:
- Heat shock caused changes in mitochondrial activity due to protein denaturation, not mitochondrial loss.
- Heat-induced alterations correlated with cytoskeleton disorganization, evidenced by perinuclear shifting of vimentin, tubulin, and mitochondria.
- Mitochondrial distribution perturbations persisted until cytoskeleton networks recovered.
Conclusions:
- Mitochondrial dysfunction under heat stress is primarily due to protein denaturation.
- Mitochondria and cytoskeleton are interconnected, with shared perinuclear redistribution during heat stress.
- Rapid recovery of respiratory properties suggests mitochondrial protein renaturation and cytoplasmic redistribution.
