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Cellular environment facilitates protein accumulation in aged rat hippocampus.
M Paz Gavilán1, José Vela, Angélica Castaño
1Departamento de Bioquímica, Bromatología, Toxicología y Medicina Legal, Facultad de Farmacia, Universidad de Sevilla, C/ Profesor García González no. 2, 41012 Sevilla, Spain.
Neurobiology of Aging
|June 21, 2005
Summary
Aging impairs the brain's ability to handle unfolded proteins, increasing Alzheimer's disease (AD) risk. Aged rats show reduced chaperone expression and faulty unfolded protein response (UPR), leading to apoptosis.
Area of Science:
- Neuroscience
- Molecular Biology
- Aging Research
Background:
- Aging is the primary risk factor for Alzheimer's disease (AD).
- Protein aggregation is a key pathological feature in AD.
- Age-related decline in cellular protein quality control systems is suspected.
Purpose of the Study:
- To investigate age-related deficits in the unfolded protein response (UPR) pathway.
- To compare the cellular stress response in young versus aged rat hippocampi.
- To elucidate molecular mechanisms contributing to age-related neurodegeneration.
Main Methods:
- Analysis of chaperone (calnexin, PDI, Grp78) expression in aged rat hippocampi.
- Assessment of protein ubiquitination levels in young and aged rats.
- Induction of cellular stress via intra-hippocampal lactacystin injection.
- Measurement of pro-apoptotic factor CHOP/GADD153 and caspase-12 activation.
Main Results:
- Aged hippocampi exhibited decreased chaperone expression and increased protein ubiquitination.
- Aged rats were less efficient in alleviating protein accumulation under stress.
- Aged rats failed to upregulate chaperone expression upon stress induction.
- Stressed aged rats showed induced CHOP/GADD153 and activated caspase-12, unlike young rats.
Conclusions:
- The unfolded protein response (UPR) is impaired in aged rat hippocampi.
- Defective UPR contributes to increased apoptosis in aged brains.
- These findings offer insights into the pathogenesis of age-related neurodegenerative disorders like AD.