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Updated: Jul 27, 2026
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Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration
Published on: March 18, 2014
Brain-derived neurotrophic factor modulates cerebellar plasticity and synaptic ultrastructure
Alexandre R Carter1, Chinfei Chen, Phillip M Schwartz
1Department of Pediatric Oncology, Dana Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.
Summary
Brain-derived neurotrophic factor (BDNF) is crucial for neuronal function. While BDNF deletion in mice doesn
Area of Science:
- Neuroscience
- Cell Biology
- Synaptic Plasticity
Background:
- Neurotrophins, like brain-derived neurotrophic factor (BDNF), are essential for neuronal survival and function.
- The TrkB receptor for BDNF is localized at parallel fiber to Purkinje cell (PF/PC) synapses in the cerebellum.
Purpose of the Study:
- To investigate the impact of TrkB receptor activation on synapse formation and function.
- To analyze the role of BDNF in cerebellar synaptic plasticity using a genetic knockout model.
Main Methods:
- Utilized mice with a targeted deletion of the BDNF gene (BDNF-/-).
- Performed immunohistochemical analysis to examine synapse formation and protein localization.
- Conducted electrophysiological recordings to assess synaptic function, including evoked and spontaneous synaptic currents.
- Employed detailed ultrastructural analysis to investigate presynaptic terminal morphology and vesicle dynamics.
Main Results:
- Purkinje cell dendrites were abnormal in BDNF-/- mice, but PF/PC synapses still formed.
- Immunohistochemistry confirmed appropriate presynaptic and postsynaptic protein apposition at PF/PC synapses.
- Electrophysiology revealed normal evoked EPSCs, spontaneous mini-EPSCs, and responses to 10 Hz stimulation.
- Paired-pulse facilitation was significantly decreased in BDNF-/- mice.
- Ultrastructural analysis showed increased total synaptic vesicles and decreased docked vesicles in BDNF-/- presynaptic terminals.
Conclusions:
- BDNF is not essential for the formation of functional PF/PC synapses, despite Purkinje cell dendritic abnormalities.
- BDNF plays a significant role in regulating short-term synaptic plasticity at PF/PC synapses.
- BDNF influences the steady-state relationship between synaptic vesicle pools within the presynaptic terminal.
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