Presynaptic Nerve Terminal
Presynaptic Nerve Terminal - Related Videos
09:37
Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
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Cited by 10 •
2009
A new means to measure neurotransmission optically using fluorescent dopamine analogs.
06:45
In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal
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Cited by 14 •
2018
Here we illustrate how single molecule photo-activated localization microscopy can be carried out on the motor nerve terminal of a live Drosophila melanogaster third instar larva.
15:16
Loading Drosophila Nerve Terminals with Calcium Indicators
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Cited by 17 •
2007
Calcium is a ubiquitous messenger in the nervous system, essential for triggering neurotransmitter release and changes in synaptic strength. Here we demonstrate a technique for loading Ca2+-indicators into Drosophila nerve terminals. We also demonstrate fabrication of the required apparatus and emphasize points critical for the technique's success.
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.
10:51
Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
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2014
Four-dimensional (4D) imaging is utilized to study the behavior and interactions among two types of endosomes in living vertebrate nerve terminals. Movement of these small structures is characterized in three dimensions, permitting confirmation of events such as endosome fusion and exocytosis.
FAQs
Calcium influx links the electrical arrival of an action potential to the chemical phase of synaptic communication. Depolarization opens voltage-gated calcium channels, allowing calcium to enter the terminal and trigger synaptic vesicle fusion with the presynaptic membrane. This coupling explains how a change in membrane voltage is converted into neurotransmitter release at a neighboring cell.
The presynaptic terminal controls neurotransmitter release, whereas the postsynaptic cell receives the signal through neurotransmitter binding to its receptors. This division allows communication to proceed in a defined direction across the synaptic cleft. Studying both sides helps distinguish mechanisms that regulate transmitter output from those that determine how the receiving neuron or target cell responds.
Signal termination depends on transporters and enzymes that act after neurotransmitter release. These mechanisms limit how long transmitter remains available to influence receptors on the postsynaptic cell. Their activity helps prevent continued signaling and makes repeated communication between cells more precisely regulated, providing an important focus for investigations of synaptic transmission.
A useful analysis follows the sequence from action-potential arrival to depolarization, voltage-gated calcium-channel opening, calcium influx, vesicle fusion, and neurotransmitter release. Researchers can then examine receptor binding on the postsynaptic cell and the transporter- or enzyme-mediated termination phase. Tracking this order separates electrical, release, receiving-cell, and signal-clearance stages.
Presynaptic terminals provide a focused way to examine how individual synaptic signals contribute to broader neural circuits. Because their activity links action potentials with neurotransmitter release, studies can connect cellular signaling to circuit processes involved in information handling, movement, and learning. This work also helps investigate how altered synaptic communication may relate to disease.
The terminal contains several stages that can influence communication, including voltage-gated calcium channels, synaptic vesicle fusion, neurotransmitter release, and signal termination by transporters or enzymes. Investigating these components shows where a drug may alter synaptic transmission. Such studies can clarify how changes at the presynaptic side affect signaling between neurons or between neurons and target cells.