Related Experiment Video
Updated: Jan 26, 2026
Directed Dopaminergic Neuron Differentiation from Human Pluripotent Stem Cells
Published on: September 15, 2014
Protein carbonylation in dopaminergic cells exposed to rotenone
Elisabetta Chiaradia1, Giovanni Renzone2, Andrea Scaloni2
1Department of Veterinary Medicine, University of Perugia, 06126 Perugia, Italy.
Abstract:
Rotenone is an environmental neurotoxin that induces degeneration of dopaminergic neurons and the most common features of Parkinson's disease in animal models. It acts as a mitochondrial complex I inhibitor that impairs cellular respiration, with consequent increase of reactive oxygen species and oxidative stress. This study evaluates the rotenone-induced oxidative damage in PC12 cells, focusing particularly on protein oxidation. The identification of specific carbonylated proteins highlighted putative alterations of important cellular processes possibly associated with Parkinson's disease. Carbonylation of ATP synthase and of enzymes acting in pyruvate and glucose metabolism suggested a failure of mechanisms ensuring cellular energy supply. Concomitant oxidation of cytoskeletal proteins and of enzymes involved in the synthesis of neuroactive molecules indicated alterations of the neurotransmission system. Carbonylation of chaperon proteins as well as of proteins acting in the autophagy-lysosome pathway and the ubiquitin-proteasome system suggested the possible formation of cytosolic unfolded protein inclusions as result of defective processes assisting recovery/degradation of damaged molecules. In conclusion, this study originally evidences specific protein targets of rotenone-induced oxidative damage, suggesting some possible molecular mechanisms involved in rotenone toxicity.
Insights
Rotenone, a neurotoxin, causes Parkinson's-like symptoms by damaging proteins essential for energy, neurotransmission, and cellular repair in PC12 cells, revealing key molecular mechanisms of toxicity.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Rotenone is an environmental neurotoxin linked to Parkinson's disease.
- It inhibits mitochondrial complex I, increasing oxidative stress.
- Parkinson's disease is characterized by dopaminergic neuron degeneration.
Purpose of the Study:
- To investigate rotenone-induced oxidative damage in PC12 cells.
- To identify specific carbonylated proteins as targets of rotenone toxicity.
- To elucidate molecular mechanisms underlying rotenone's neurotoxic effects.
Main Methods:
- Exposure of PC12 cells to rotenone.
- Analysis of protein carbonylation using proteomic techniques.
- Identification of specific oxidized proteins and their functions.
Main Results:
- Rotenone induced significant protein carbonylation in PC12 cells.
- Key targets included ATP synthase and enzymes in glucose/pyruvate metabolism, indicating impaired energy supply.
- Oxidation of cytoskeletal proteins, neurotransmission enzymes, chaperones, and autophagy/ubiquitin-proteasome system proteins was observed.
- These alterations suggest dysfunction in cellular energy, neurotransmission, and protein degradation pathways.
Conclusions:
- This study identifies specific protein targets of rotenone-induced oxidative damage.
- Findings suggest molecular mechanisms involving energy metabolism, neurotransmission, and protein homeostasis.
- These mechanisms may contribute to rotenone's neurotoxicity and Parkinson's disease pathogenesis.
Related Concept Videos
02:23Alcohols from Carbonyl Compounds: Reduction
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
01:18Nucleophilic Addition to the Carbonyl Group: General Mechanism
A stronger nucleophile can directly attack the electrophilic center, the carbonyl carbon. The HOMO orbital of the nucleophile interacts with the LUMO (π* antibonding) orbital present on the carbonyl carbon. This interaction breaks the π bond and shifts the π...
02:15Protein and Protein Structure
A protein's shape is critical to its function. For example, an enzyme...
01:29IR Frequency Region: Alkene and Carbonyl Stretching
Stretching frequencies are affected by several factors, such as resonance, inductive effects, ring strain, dipole moment, and hydrogen bonding. Consequently, the stretching frequency of the carbonyl double bond...
02:00Alcohols from Carbonyl Compounds: Grignard Reaction
Magnesium from the reagent coordinates with carbonyl oxygen, further reducing the carbonyl carbon's electron density. Thus, the...
01:09Conjugate Addition to α,β-Unsaturated Carbonyl Compounds