Modeling the Role of Hsp70/Hsp90 in Protein Homeostasis
Author Information
Author(s): Carole J. Proctor, Ian A. J. Lorimer
Primary Institution: Centre for Integrated Systems Biology of Ageing and Nutrition, Institute for Ageing and Health, Newcastle University
Hypothesis
Under normal conditions, basal levels of chaperones are able to maintain protein homeostasis; under conditions of low or moderate stress, there is a transient increase in protein misfolding but chaperones are upregulated and protein homeostasis is restored; and under conditions of prolonged high stress, the chaperone system is overwhelmed and apoptosis takes place.
Conclusion
The model predicts that protein homeostasis can be maintained during short periods of stress, but prolonged stress overwhelms the chaperone system, leading to increased cell death.
Supporting Evidence
- The model predicts that protein homeostasis can be maintained during short periods of stress.
- Under prolonged stress, the chaperone system becomes overwhelmed, leading to increased cell death.
- Inhibiting cell death pathways may delay cell death but does not stop the aggregation process.
Takeaway
This study shows that our cells have helpers called chaperones that keep proteins healthy. If there's too much stress for too long, these helpers can't keep up, and the cells can die.
Methodology
Mathematical modeling and simulations were used to study the role of Hsp70 and Hsp90 chaperones in maintaining protein homeostasis under different stress conditions.
Limitations
The model simplifies complex biological processes and does not include all details of apoptotic pathways.
Digital Object Identifier (DOI)
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