Related Experiment Video
Updated: Oct 17, 2025
18:11
Quantifying Synapses: an Immunocytochemistry-based Assay to Quantify Synapse Number
Published on: November 16, 2010
36.1K
Synapse development is regulated by microglial THIK-1 K+ channels.
Pablo Izquierdo1, Hiroko Shiina1, Chanawee Hirunpattarasilp1
1Department of Neuroscience, Physiology and Pharmacology, University College London, London WC1E 6BT, United Kingdom.
Summary
Microglia, the brain's immune cells, survey for and remove cellular waste via phagocytosis. Their functions, including ramification and motility, are regulated by the tonically active THIK-1 potassium channel.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the primary immune cells within the central nervous system.
- These cells perform essential functions such as synaptic pruning, debris clearance, and removal of dying cells through phagocytosis.
- Understanding the regulation of microglial functions is crucial for comprehending brain health and disease.
Purpose of the Study:
- To investigate the role of the THIK-1 potassium channel in regulating microglial functions.
- To elucidate the mechanisms by which THIK-1 influences microglial ramification, motility, and cytokine release.
Main Methods:
- Utilized advanced imaging techniques to observe microglial behavior in real-time.
- Employed electrophysiological methods to assess THIK-1 channel activity.
- Analyzed cytokine profiles following modulation of THIK-1 activity.
Main Results:
- Demonstrated that tonically active THIK-1 channels significantly regulate microglial ramification and motility.
- Showcased a direct correlation between THIK-1 activity and the phagocytic capacity of microglia.
- Identified specific cytokine release patterns modulated by THIK-1 activity.
Conclusions:
- The THIK-1 potassium channel is a key regulator of essential microglial functions.
- Targeting THIK-1 may offer novel therapeutic strategies for neurological disorders involving microglial dysfunction.
Related Concept Videos
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
3.0K
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...
3.0K
01:26Chemical Synapses
9.9K
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...
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...
9.9K
02:47The Synapse
129.2K
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.
129.2K
01:28Integration of Synaptic Events
2.5K
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...
2.5K
01:19The Role of Ion Channels in Neuronal Computation
3.3K
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....
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....
3.3K
01:29Excitatory and Inhibitory Effects of Neurotransmitters
11.4K
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...
11.4K