Synaptic Excitation
Synaptic Excitation - Related Videos
08:46
Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
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Cited by 18 •
2010
FM dyes have been of invaluable help in the understanding of synaptic dynamics. FMs are normally followed under the fluorescent microscope during different stimulation conditions. However, photoconversion of FM dyes combined with electron microscopy allows the visualization of distinct synaptic vesicle pools, among other ultrastructure components, in synaptic boutons.
10:19
Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
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Cited by 3 •
2016
This procedure performs long-lasting in vivo intracellular recordings from single neurons during physiologically relevant cerebral states and after complete abolition of ongoing electrical activities, resulting in an isoelectric brain state. The physiological constants of the animal are carefully monitored during the transition to the artificial comatose condition.
08:38
Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals
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Cited by 17 •
2011
This report demonstrates a technique for mechanical isolation of individual viable neurons retaining attached presynaptic boutons. Vibrodissociated neurons have the advantages of rapid production, excellent pharmacological control and improved space-clamp without influence from neighboring cells. This method can be used for imaging of synaptic elements and patch-clamp recording.
02:29
External Excitation of One-Dimensional Patterned Neuronal Cultures
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2025
This video demonstrates a technique for stimulating line-patterned neuronal cultures with a uniform, unidirectional electric field.
12:22
Automated Quantification of Synaptic Fluorescence in C. elegans
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Cited by 5 •
2012
The abundance of neurotransmitter receptors clustered at synapses strongly influences synaptic strength. This method quantifies fluorescently-labeled neurotransmitter receptors in three dimensions with single-synapse resolution in C. elegans, allowing hundreds of synapses to be rapidly characterized within a single sample without distortions introduced by z-plane projection.
FAQs
The postsynaptic response depends on two linked events: an excitatory neurotransmitter binds its receptor, and the associated ion channel permits positively charged ions to enter the receiving cell. This inward movement shifts the membrane toward depolarization and produces an excitatory postsynaptic potential. The size of that change influences whether the cell approaches the firing threshold.
An excitatory postsynaptic potential does not automatically produce an action potential. It must depolarize the receiving neuron sufficiently to reach threshold. Once that point is reached, the cell fires, converting a local postsynaptic change into an electrical signal that can continue neural communication. This threshold relationship helps explain why differences in excitation can alter overall nervous-system activity.
Drugs can change excitatory signaling through several pharmacological actions. An agonist can activate a receptor, whereas an antagonist can prevent receptor activation. Channel modulation offers another route by changing the ion-channel contribution to the postsynaptic response. These interventions can influence depolarization, the likelihood of reaching threshold, and the resulting electrical activity.
The critical outcome depends on how strongly receptor activation changes ion movement and how much depolarization reaches the threshold for an action potential. Excitatory signaling therefore reflects more than neurotransmitter presence alone: receptor engagement, channel behavior, and the resulting postsynaptic electrical change all affect whether the receiving neuron remains below threshold or fires.
A pharmacological analysis can follow the sequence from excitatory neurotransmitter interaction with postsynaptic receptors to ion-channel opening, depolarization, and possible action-potential generation. Investigators can then examine how an agonist, antagonist, or channel modulator changes that sequence. This framework connects receptor-level drug action with altered electrical signaling in the nervous system.
Synaptic excitation has pharmacological relevance to pain, epilepsy, learning, and disorders associated with imbalanced excitation. In each area, the key issue is how changes in excitatory communication influence neural activity. Studying receptor actions and ion-channel modulation can therefore help relate molecular drug effects to broader changes in signaling and to conditions where excitation becomes clinically important.