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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
Axonal and synaptic remodeling in the mature cerebellar cortex
Roberta Cesa1, Piergiorgio Strata
1Rita Levi Montalcini Center for Brain Repair, Corso Raffaello 30, 10125 Turin, Italy IRCCS Santa Lucia Foundation, Via Ardeatina 306, 00179, Rome, Italy. roberta.cesa@unito.it
Progress in Brain Research
|January 22, 2005
Summary
Purkinje cells exhibit plasticity in response to neuronal input. Climbing fibers actively displace parallel fibers by inhibiting their activity, securing their territory on Purkinje cell dendrites.
Area of Science:
- Neuroscience
- Cell Biology
- Synaptic Plasticity
Background:
- Purkinje cells in the cerebellar cortex are innervated by parallel fibers and climbing fibers.
- The glutamate receptor delta2 subunit (GluRdelta2) is crucial for synaptic function and targeting.
Purpose of the Study:
- To investigate the mechanisms of axonal competition and target innervation by climbing fibers and parallel fibers on Purkinje cells.
- To understand the role of electrical activity and GluRdelta2 in synaptic plasticity and territory establishment.
Main Methods:
- Electrical blockade of cerebellar cortex activity.
- Induction of climbing fiber denervation via inferior olive lesion.
- Analysis of Purkinje cell dendritic spine morphology and GluRdelta2 subunit localization.
- Observation of climbing fiber reinnervation and synaptic remodeling.
Main Results:
- Blocking electrical activity leads to uniform GluRdelta2 expression and parallel fiber innervation on Purkinje cell dendrites.
- Climbing fibers target spines with GluRdelta2 before disconnecting, and reinnervate proximal dendrites bearing GluRdelta2 after lesion.
- Active climbing fibers repress GluRdelta2 and displace parallel fibers to distal dendrites, an activity-dependent process.
Conclusions:
- Purkinje cells possess an intrinsic profile favoring parallel fiber innervation.
- Climbing fibers require activity-dependent mechanisms to displace parallel fibers and secure their proximal dendritic territory.
- This activity-dependent inhibition is essential for maintaining climbing fiber territory beyond the developmental period.
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