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Updated: Jul 16, 2026
09:30
Assessment of Long-term Depression Induction in Adult Cerebellar Slices
Published on: October 16, 2019
Phospholipase C is required for changes in postsynaptic structure and function associated with NMDA
Eric A Horne1, Mark L Dell'Acqua
1Department of Pharmacology, School of Medicine, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045, USA.
Summary
Phospholipase C (PLC) signaling is crucial for NMDAR-dependent long-term depression (LTD) in the hippocampus. PLC activation drives changes in dendritic spine structure and AMPA receptor (AMPAR) function, impacting learning and memory processes.
Area of Science:
- Neuroscience
- Molecular Biology
- Synaptic Plasticity
Background:
- NMDA receptor (NMDAR)-dependent synaptic plasticity, vital for learning and memory, involves coordinated regulation of dendritic spine structure and AMPA receptor (AMPAR) postsynaptic strength.
- Long-term depression (LTD) involves calcineurin (CaN) activation, leading to spine shrinkage, actin depolymerization, and AMPAR internalization.
- The AKAP79/150-PSD95 complex regulates AMPAR phosphorylation via PKA and CaN, but its disruption during LTD and the role of phospholipase C (PLC) remain unclear.
Purpose of the Study:
- To elucidate the signaling mechanisms linking PLC activation to structural and functional changes in dendritic spines during NMDAR-dependent LTD.
- To investigate the necessity of PLC signaling in NMDAR-induced alterations of spine actin, PSD scaffolding, and AMPAR trafficking.
Main Methods:
- Utilized cultured hippocampal neurons to study NMDAR stimulation and its downstream signaling pathways.
- Investigated the role of PLC in NMDAR-dependent LTD using electrophysiological and biochemical techniques.
- Examined the impact of PLC activation on dendritic spine actin, AKAP79/150 localization, PSD95 levels, and AMPAR internalization.
Main Results:
- NMDAR stimulation of PLC in hippocampal neurons is essential for the loss of AKAP79/150 from spines and actin depolymerization.
- NMDAR activation of PLC is also required for the reduction in spine PSD95 levels and the internalization of AMPARs.
- PLC signaling mediates the structural and functional modifications of dendritic spines underlying postsynaptic LTD.
Conclusions:
- Phospholipase C (PLC) signaling acts as a critical mediator in NMDAR-dependent LTD.
- PLC activation is indispensable for the structural remodeling of dendritic spines, including actin dynamics and scaffolding protein regulation.
- These findings reveal a key molecular pathway by which NMDARs control AMPAR trafficking and synaptic strength during LTD, impacting learning and memory.
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