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Published on: April 26, 2024
Acrolein induces selective protein carbonylation in synaptosomes.
C F Mello1, R Sultana, M Piroddi
1Department of Chemistry, Center of Membrane Sciences and Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40506, USA.
Neuroscience
|June 16, 2007
Summary
Acrolein, a reactive aldehyde found in Alzheimer's disease brains, selectively damages key proteins in brain cells. This study identifies specific proteins carbonylated by acrolein, highlighting its role in oxidative damage.
Area of Science:
- Neuroscience
- Biochemistry
- Oxidative Stress Research
Background:
- Acrolein, a reactive alpha,beta-unsaturated aldehyde, is endogenously produced via lipid peroxidation.
- Elevated acrolein levels are observed in the brains of Alzheimer's disease (AD) patients.
- Acrolein is known to increase protein carbonylation and impair protein function, but specific targets remain unidentified.
Purpose of the Study:
- To investigate the dose-dependent effect of acrolein on protein carbonylation in gerbil synaptosomes.
- To identify specific synaptosomal proteins selectively carbonylated by acrolein using proteomics.
Main Methods:
- Gerbil synaptosomes were exposed to varying concentrations of acrolein (0-50 microM).
- Total protein carbonylation was assessed.
- Proteomics, including two-dimensional electrophoresis and mass spectrometry, was employed to identify carbonylated proteins at 0.5 microM acrolein.
Main Results:
- Acrolein induced protein carbonylation in a dose-dependent manner.
- Proteomic analysis identified tropomyosin-3-gamma isoform 2, tropomyosin-5, beta-actin, mitochondrial Tu translation elongation factor (EF-Tu(mt)), and voltage-dependent anion channel (VDAC) as significantly carbonylated proteins.
- The identified proteins are crucial for cellular functions like energy metabolism, neurotransmission, protein synthesis, and cytoskeletal integrity.
Conclusions:
- Acrolein selectively carbonylation of key synaptosomal proteins occurs in a dose-dependent manner.
- The identified proteins are implicated in cellular processes vital to neuronal function.
- These findings suggest acrolein significantly contributes to the oxidative damage observed in Alzheimer's disease brains.
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