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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Chemical Synapses01:26

Chemical Synapses

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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Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Neurochemical Transmission: Sites of Drug Action01:26

Neurochemical Transmission: Sites of Drug Action

Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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Related Experiment Video

Updated: May 11, 2026

Live Cell Calcium Imaging Combined with siRNA Mediated Gene Silencing Identifies Ca2+ Leak Channels in the ER Membrane and their Regulatory Mechanisms
13:40

Live Cell Calcium Imaging Combined with siRNA Mediated Gene Silencing Identifies Ca2+ Leak Channels in the ER Membrane and their Regulatory Mechanisms

Published on: July 7, 2011

Complexins regulate a late step in Ca2+-dependent neurotransmitter release.

K Reim1, M Mansour, F Varoqueaux

  • 1Max-Planck-Institut für Experimentelle Medizin, Abteilung Neurogenetik, AG Molekulare Neurobiologie, Hermann-Rein-Str. 3, D-37075 Göttingen, Bundesrepublik, Deutschland.

Cell
|February 13, 2001
PubMed
Summary

Complexins are crucial for efficient synaptic vesicle fusion and neurotransmitter release. Neurons lacking these proteins exhibit significantly reduced release due to impaired calcium sensitivity.

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Live Cell Calcium Imaging Combined with siRNA Mediated Gene Silencing Identifies Ca2+ Leak Channels in the ER Membrane and their Regulatory Mechanisms
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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Synaptic vesicle fusion, essential for neurotransmission, is initiated by calcium (Ca2+) influx.
  • The precise Ca2+ sensor and the mechanism translating Ca2+ signals into fusion remain unidentified.

Purpose of the Study:

  • To investigate the role of Complexins in regulating Ca2+-triggered synaptic vesicle fusion and neurotransmitter release.

Main Methods:

  • Analysis of neurons genetically modified to lack Complexins.
  • Electrophysiological recordings to measure synaptic transmission efficiency and Ca2+ sensitivity.

Main Results:

  • Complexin-deficient neurons display markedly reduced neurotransmitter release efficiency.
  • This reduction is attributed to decreased Ca2+ sensitivity in the synaptic secretion process.

Conclusions:

  • Complexins are key regulators acting at or after the Ca2+-triggering step of fast synchronous release.
  • They modulate the Ca2+ sensor, its interaction with the fusion machinery, or the fusion apparatus efficiency.