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Related Concept Videos

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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...
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Postsynaptic Potential (PSP)01:32

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Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Vesicular release statistics and unitary postsynaptic current at single GABAergic synapses.

Camila Pulido1, Federico F Trigo1, Isabel Llano1

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Summary

Vesicular docking sites at central synapses vary in number, influencing release probability and synaptic current. Docking site occupancy controls single synapse signaling and intersynaptic variability.

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Area of Science:

  • Neuroscience
  • Synaptic transmission
  • Cell biology

Background:

  • Vesicular docking sites are crucial for neurotransmitter release at central synapses.
  • Their precise functional role in synaptic variability remains largely unknown.
  • Previous studies suggest morphological and biochemical evidence for their existence.

Purpose of the Study:

  • To investigate the functional role of vesicular docking sites in synaptic transmission.
  • To determine how docking site number and occupancy influence synaptic signaling.
  • To explore the mechanisms underlying intersynaptic variability.

Main Methods:

  • Studied single depressing GABAergic synapses.
  • Utilized failure/success patterns to estimate vesicular docking site numbers (1-6 per synapse).
  • Analyzed presynaptic and postsynaptic parameters during repetitive stimulation and conditioning potential steps.

Main Results:

  • Synaptic docking site numbers correlated with release probability and postsynaptic current properties.
  • Decreasing docking site occupancy affected both presynaptic and postsynaptic parameters during stimulation.
  • Steady-state docking site occupancy was modulated by presynaptic conditioning potential steps.

Conclusions:

  • Variations in the number of docking sites contribute to intersynaptic variability.
  • Docking site occupancy is a critical factor controlling single synapse signaling.
  • Understanding docking sites offers insights into synaptic plasticity and function.