Related Experiment Video
Updated: Apr 12, 2026
11:02
Presynaptically Silent Synapses Studied with Light Microscopy
Published on: January 4, 2010
12.0K
Membrane-derived phospholipids control synaptic neurotransmission and plasticity.
Victoria García-Morales1, Fernando Montero1, David González-Forero1
1Grupo de Neurodegeneración y Neuroreparación (GRUNEDERE), Área de Fisiología, Facultad de Medicina, Universidad de Cádiz, Cádiz, Spain.
Plos Biology
|May 22, 2015
Summary
Lysophosphatidic acid (LPA) rapidly alters brain signaling by modulating excitatory and inhibitory synapses. This phospholipid signaling tunes synaptic strength, impacting neuronal networks and motor control.
Area of Science:
- Neuroscience
- Molecular Biology
- Cellular Signaling
Background:
- Synaptic communication is crucial for brain function, but molecular regulators of its dynamics remain unclear.
- Membrane-derived phospholipids are potential candidates for short-term synaptic plasticity.
- Understanding these signals is key to deciphering information processing in neuronal networks.
Purpose of the Study:
- To investigate the role of phospholipids, specifically lysophosphatidic acid (LPA), in regulating synaptic transmission.
- To elucidate the molecular mechanisms underlying LPA's effects on excitatory and inhibitory synapses.
- To determine LPA's contribution to synaptic plasticity and motor output regulation.
Main Methods:
- Electrophysiological recordings of excitatory and inhibitory postsynaptic currents.
- Pharmacological manipulation of signaling pathways (LPA1, Gα proteins, PLC, MLCK, RhoA, ROCK, calcineurin).
- Analysis of synaptic vesicle dynamics and receptor trafficking.
- In vivo models of synaptic plasticity and motor output.
Main Results:
- LPA rapidly and reversibly depressed both excitatory and inhibitory postsynaptic currents.
- Presynaptic mechanisms involving LPA1/Gαi/o/PLC/MLCK reduced synaptic vesicle docking at excitatory synapses.
- Postsynaptic mechanisms involving LPA1/Gα12/13/RhoA/ROCK/calcineurin led to GABAA receptor dephosphorylation and reduced surface expression at inhibitory synapses.
- Endogenous LPA signaling mediated activity-dependent synaptic depression and regulated motor output.
Conclusions:
- Lysophosphatidic acid acts as a local messenger modulating synaptic strength based on neuronal activity.
- Distinct presynaptic and postsynaptic molecular pathways mediate LPA's differential effects on excitatory and inhibitory neurotransmission.
- LPA signaling plays a significant role in synaptic plasticity and the regulation of fundamental brain processing tasks like motor control.
Related Concept Videos
01:26Chemical Synapses
10.3K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
10.3K
01:26Chemical Synapses
12.7K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
12.7K
01:23Role of Neurotransmitters in Memory
2.9K
Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
2.9K
01:03Long-term Depression
3.6K
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.
Calcium Ion Concentration Mechanism
If over...
Calcium Ion Concentration Mechanism
If over...
3.6K
01:05Long-term Depression
33.8K
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.
33.8K
01:32Membrane Lipids
35.7K
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
35.7K