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Updated: May 13, 2026
11:29
Investigation of Synaptic Tagging/Capture and Cross-capture using Acute Hippocampal Slices from Rodents
Published on: September 4, 2015
Signaling pathways involved in striatal synaptic plasticity are sensitive to temporal pattern and exhibit spatial
BoHung Kim1, Sarah L Hawes, Fawad Gillani
1School of Mechanical Engineering, University of Ulsan, Ulsan, South Korea.
Plos Computational Biology
|March 22, 2013
Summary
Understanding how brain cells learn is key. This study shows that the timing of neural signals determines whether brain cells strengthen (LTP) or weaken (LTD) connections, impacting learning and memory.
Area of Science:
- Neuroscience
- Computational Biology
- Cellular Signaling
Background:
- The basal ganglia are crucial for learning and motor control.
- Synaptic plasticity in the striatum underlies learning and information processing.
- Mechanisms differentiating long-term potentiation (LTP) and long-term depression (LTD) based on calcium influx patterns are unclear.
Purpose of the Study:
- To investigate if temporal stimulation patterns dictate endocannabinoid production (for LTD) or protein kinase C (PKC) activation (for LTP) in striatal medium spiny projection neurons (MSPNs).
- To model and understand the spatio-temporal dynamics of synaptic plasticity selection.
Main Methods:
- Development and validation of a stochastic computational model of postsynaptic signaling pathways in dendritic spines.
- Comparison of model predictions with experimental data on endocannabinoid-dependent plasticity.
- Simulations to analyze the effects of different stimulation patterns (theta burst vs. 20 Hz) on PKC and endocannabinoid pathways.
Main Results:
- Theta burst stimulation leads to increased PKC activation compared to 20 Hz stimulation, which favors LTD.
- Experimental validation confirmed PKC activation is necessary for theta burst-induced LTP.
- Model simulations revealed LTP is spatially specific to individual spines, while LTD is more diffuse.
Conclusions:
- Temporal patterns of synaptic input effectively select distinct plasticity pathways (PKC for LTP, endocannabinoids for LTD) in striatal MSPNs.
- Spine-level spatial specificity differentiates LTP from LTD, suggesting a mechanism for precise information processing in the basal ganglia.
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01:35Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
01:25Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
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01:22Diversity in Cell Signaling Responses
The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity.
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01:09Synaptic Signaling
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
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01:12Synaptic Signaling
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01:03Long-term Depression
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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