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08:47
Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
Published on: May 1, 2020
Dendritic eIF4E-binding protein 1 (eIF4E-BP1) mRNA is upregulated by neuronal activation
Il Soo Moon1, Hyung Jong Lee, In Sick Park
1Department of Anatomy, Dongguk University College of Medicine, and Medical Institute of Dongguk University, Gyeongju, Korea. moonis@dongguk.ac.kr
Journal of Korean Medical Science
|October 24, 2012
Summary
The study found that eukaryotic translation initiation factor 4E (eIF4E)-binding protein 1 (4EBP1) mRNA is present in dendrites of rat hippocampal neurons. Neuronal activation increases this dendritic mRNA, suggesting a role in local protein synthesis for synaptic plasticity.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Long-term synaptic plasticity relies on the synthesis of new proteins at synapses.
- Local protein synthesis in dendrites allows for dynamic regulation of synaptic composition.
- Knowledge regarding specific dendritic mRNAs involved in this process remains limited.
Purpose of the Study:
- To investigate the expression and localization of eukaryotic translation initiation factor 4E (eIF4E)-binding protein 1 (4EBP1) protein and mRNA in cultured rat hippocampal neurons.
- To determine if 4EBP1 mRNA is present in dendrites and if its expression is affected by neuronal activation.
Main Methods:
- Immunocytochemistry (ICC) was used to detect 4EBP1 protein.
- In situ hybridization (ISH) and Fluorescence ISH (FISH) were employed to visualize 4EBP1 mRNA.
- Cultured rat hippocampal neurons were subjected to KCl-induced neuronal activation.
Main Results:
- 4EBP1 protein was predominantly found in the nucleus, with limited colocalization with eIF4E in dendrites.
- 4EBP1 mRNA was detected in dendrites, often clustered in Staufen-positive RNA granules.
- Neuronal activation led to increased 4EBP1 mRNA levels in both the nucleus and dendrites.
Conclusions:
- 4EBP1 protein and its mRNA are localized to the dendrites of hippocampal neurons.
- Neuronal activation upregulates 4EBP1 mRNA and promotes its transport to dendritic domains via RNA granules.
- These findings suggest a role for dendritic 4EBP1 mRNA in activity-dependent local protein synthesis at synapses.
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