Melatonin attenuates beta-amyloid-induced inhibition of neurofilament expression
Ying-chun Zhang1, Ze-fen Wang, Qun Wang
1Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
Aim:
To explore the effect of beta-amyloid (A beta) on metabolism of cytoskeletal protein neurofilament, and search for effective cure to the lesion.
Methods:
Wild type murine neuroblastoma N2a (N2awt) and N2a stably transfected with wild type amyloid precursor protein (N2aAPP) were cultured. Sandwich ELISA, immunocytochemistry, and Western blot were used respectively to measure the level of A beta, the expression and phosphorylation of neurofilament proteins.
Results:
The immunoreactivity of neurofilament protein was almost abolished in N2aAPP, which beard a significantly higher level of A beta. Melatonin effectively decreased the level of A beta, and restored partially the level of phosphorylated and non-phosphorylated neurofilament in N2aAPP.
Conclusion:
Overproduction of A beta inhibits neurofilament expression, and melatonin attenuates the A beta-induced lesion in cytoskeletal protein.
Insights
Beta-amyloid (A beta) overproduction impairs neurofilament protein expression. Melatonin treatment partially restores neurofilament levels, suggesting a potential therapeutic approach for A beta-induced neurotoxicity.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Beta-amyloid (A beta) accumulation is implicated in neurodegenerative diseases.
- Neurofilaments are crucial cytoskeletal components in neurons.
- The impact of A beta on neurofilament metabolism requires further elucidation.
Purpose of the Study:
- To investigate the effect of A beta on neurofilament protein metabolism.
- To identify potential therapeutic interventions for A beta-induced neurofilament damage.
Main Methods:
- Utilized wild-type murine neuroblastoma N2a (N2awt) and N2a cells overexpressing amyloid precursor protein (N2aAPP).
- Quantified A beta levels using sandwich ELISA.
- Assessed neurofilament protein expression and phosphorylation via immunocytochemistry and Western blot.
Main Results:
- N2aAPP cells exhibited significantly higher A beta levels and near-abolished neurofilament immunoreactivity.
- Melatonin treatment reduced A beta levels in N2aAPP cells.
- Melatonin partially restored both phosphorylated and non-phosphorylated neurofilament levels in N2aAPP cells.
Conclusions:
- A beta overproduction inhibits neurofilament expression.
- Melatonin demonstrates a therapeutic potential in mitigating A beta-induced damage to cytoskeletal proteins.
