Related Experiment Video
Updated: Jun 2, 2026
16:38
Dual Electrophysiological Recordings of Synaptically-evoked Astroglial and Neuronal Responses in Acute Hippocampal Slices
Published on: November 26, 2012
Astrocytes as regulators of synaptic function: a quest for the Ca2+ master key
Dmitri A Rusakov1, Kaiyu Zheng, Christian Henneberger
1UCL Institute of Neurology, University College London, London, UK. d.rusakov@ion.ucl.ac.uk
Summary
Astrocytes, or astroglia, communicate with neurons but appear slow. New experimental methods are needed to understand nanoscale calcium signaling in astrocytes for better insight into their role in neural communication.
Area of Science:
- Neuroscience
- Cellular biology
- Astrocyte biology
Background:
- Astrocytes play a role in neural communication, but their signaling mechanisms are poorly understood.
- Astrocyte signaling appears slow and imprecise compared to neuronal signaling.
- Doubts exist regarding the primary Ca2+-dependent mechanisms of gliotransmitter release.
Purpose of the Study:
- To address the conceptual challenges in understanding astrocyte signaling.
- To review current experimental approaches for studying astrocyte function.
- To highlight the need for new methods to investigate nanoscale astrocytic Ca2+ signaling.
Main Methods:
- Review of existing experimental approaches for studying astrocytes.
- Analysis of limitations and advantages of current methodologies.
- Discussion of the need for nanoscale resolution in studying astrocytic Ca2+ signaling.
Main Results:
- Current experimental methods have limitations in fully elucidating astrocytic Ca2+ signaling.
- Existing approaches may not be compatible with physiological conditions.
- A gap exists in understanding the nanoscale mechanisms of intra-astrocyte Ca2+ signaling.
Conclusions:
- Further research is needed to understand the precise mechanisms of astrocytic Ca2+ signaling.
- Development of novel experimental approaches is crucial for advancing the field.
- Understanding astrocytic Ca2+ signaling is key to deciphering their role in neural communication.
Related Concept Videos
01:30Ligand-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...
01:26Chemical 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.
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...
01:26Chemical 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.
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...
01:19The 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.
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.
01:25Overview of Synapses
A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
01:16Calmodulin-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.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...