Presynaptic Terminal
Presynaptic 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.
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.
11:02
Presynaptically Silent Synapses Studied with Light Microscopy
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Cited by 14 •
2010
Glutamatergic synapses can switch from an active mode to a silent mode. We demonstrate that presynaptic activity status in dissociated culture of rodent neurons is visualized using a fixable form of the FM1-43 dye to visualize active synapses and immunostaining with vGluT-1 antibody to visualize all glutamate synapses.
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.
12:01
Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals
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Cited by 1 •
2014
Recording Ca2+ currents at the presynaptic release face membrane is key to a precise understanding of Ca2+ entry and neurotransmitter release. We present an acute dissociation of the lamprey spinal cord that yields functional isolated reticulospinal axons, permitting recording directly from the release face membrane of individual presynaptic terminals.
FAQs
Calcium entry converts the electrical arrival of an action potential into a chemical release event. Depolarization opens voltage-gated calcium channels, allowing calcium to enter the presynaptic terminal and trigger synaptic vesicles to fuse with the presynaptic membrane. This coupling determines how an electrical signal produces neurotransmitter release for communication with the neighboring cell.
Voltage-gated calcium channels act as the signal-sensitive gateway between membrane excitation and neurotransmitter secretion. They remain responsive to the voltage change associated with an arriving action potential, then open to permit calcium influx. Because that influx triggers vesicle fusion, these channels connect neuronal electrical activity with the chemical stage of synaptic transmission.
After calcium triggers synaptic vesicles to fuse with the presynaptic membrane, neurotransmitters enter the synaptic cleft and reach the neighboring cell. Binding to postsynaptic receptors can then alter that cell’s electrical or biochemical response. Thus, vesicle fusion is the step that enables presynaptic activity to produce a response beyond the releasing neuron.
Examining presynaptic terminals links an action potential in one neuron to neurotransmitter release and a response in a neighboring cell. Following this chain helps researchers interpret how individual communication events contribute to synaptic transmission and, in turn, neural circuit function. The terminals therefore provide a cellular point of connection between neuronal activity and network behavior.
A useful analysis follows the process from action-potential arrival to calcium-channel opening, calcium entry, vesicle fusion, neurotransmitter release, receptor binding, and the resulting postsynaptic response. Organizing observations in this sequence helps distinguish electrical, release, and receptor-mediated stages. It also clarifies where a change in communication may arise within the signaling pathway.
Presynaptic terminals are relevant because changes in their communication can help explain altered neural signaling associated with development, disease, or pharmacological treatments. Studying the progression from calcium-triggered release to the neighboring cell’s response can reveal how communication changes. These findings support broader investigations of neural function and therapeutic discovery in neurobiology.