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Chemical Synapses01:26

Chemical Synapses

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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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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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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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Postsynaptic synucleins mediate endocannabinoid signaling.

Eddy Albarran1,2, Yue Sun2, Yu Liu2

  • 1Neurosciences Graduate Program, Stanford University, Stanford, CA, USA.

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Endocannabinoid release from neurons unexpectedly requires synucleins, proteins linked to Parkinson's disease. This discovery reveals a new mechanism for synaptic plasticity and neurotransmitter release.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Endocannabinoids are crucial modulators of synaptic transmission.
  • The release mechanisms of endocannabinoids from postsynaptic compartments remain poorly understood.

Purpose of the Study:

  • To investigate the mechanism of endocannabinoid release from postsynaptic compartments.
  • To determine the role of synucleins in endocannabinoid release and synaptic plasticity.

Main Methods:

  • Whole-cell recordings and optical monitoring of endocannabinoid signaling.
  • Genetic manipulation including synuclein deletion and postsynaptic expression of wild-type or mutant α-synuclein.
  • Inhibition of SNARE proteins using tetanus toxin light chain.

Main Results:

  • Synuclein deletion blocks endocannabinoid-dependent synaptic plasticity.
  • Postsynaptic expression of wild-type α-synuclein rescues the plasticity defect, while mutant α-synuclein does not.
  • Evidence suggests endocannabinoid release occurs via a synuclein-dependent and SNARE-dependent membrane interaction mechanism.

Conclusions:

  • Synucleins are essential for postsynaptic endocannabinoid release.
  • This finding implicates synucleins in synaptic plasticity beyond their known presynaptic roles.
  • The study uncovers a novel pathway for endocannabinoid signaling and neurotransmitter release.