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Destabilization of cortical dendrites and spines by BDNF
H W Horch1, A Krüttgen, S D Portbury
1Howard Hughes Medical Institute, Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA. hwilson@neuro.duke.edu
Neuron
|July 10, 1999
Summary
Brain-derived neurotrophic factor (BDNF) dramatically alters neuronal structure, causing dendrite sprouting and spine regression. This BDNF-induced instability in neuronal morphology may link neural activity to structural changes.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Neuronal structure, including dendrites and spines, is critical for brain function.
- Brain-derived neurotrophic factor (BDNF) is known to influence neuronal survival and growth.
Purpose of the Study:
- To investigate the effects of BDNF on the structural dynamics of cortical pyramidal neuron dendrites and spines.
- To elucidate the mechanisms underlying BDNF-mediated structural changes in neurons.
Main Methods:
- Particle-mediated gene transfer was used to introduce genes into individual neurons.
- Two-photon microscopy enabled real-time monitoring of dendritic and spine morphology.
- Pharmacological agents (Trk receptor bodies, K252a) and gene overexpression (NGF) were employed to probe signaling pathways.
Main Results:
- Neurons coexpressing green fluorescent protein (GFP) and BDNF showed significant basal dendrite sprouting and dendritic spine regression compared to GFP-only controls.
- Newly formed dendrites and spines in BDNF-expressing neurons exhibited marked structural instability.
- These effects were confirmed to be mediated by secreted BDNF acting through extracellular TrkB receptors.
Conclusions:
- BDNF induces structural instability in neuronal dendrites and spines.
- This instability may play a role in translating neural activity patterns into specific morphological adaptations.
- BDNF signaling via TrkB receptors is a key regulator of neuronal structural plasticity.