In Vivo Two-Photon Imaging of Microglial Synapse Contacts

Daisuke Kato1,2, Ako Ikegami2, Hiroshi Horiuchi1,3

  • 1Division of Homeostatic Development, National Institute for Physiological Sciences, Okazaki, Japan.

Insights

Microglia, the brain's immune cells, also shape synapses. This study presents a new method for noninvasively observing microglia-synapse interactions in living animals, crucial for understanding brain development and disease.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglia are brain immune cells traditionally linked to neurodegenerative diseases.
  • Emerging research highlights microglia's role in organizing and modifying synapses.
  • Microglia-synapse interactions are critical in brain development and disease pathogenesis.

Purpose of the Study:

  • To describe a novel technique for monitoring microglia-synapse interactions.
  • To enable noninvasive in vivo observation of these crucial cellular processes.

Main Methods:

  • Two-photon microscopy was employed for in vivo imaging.
  • The technique allows for real-time visualization of microglia and their interactions with synapses.

Main Results:

  • The study successfully demonstrated a method for noninvasive in vivo monitoring of microglia-synapse interactions.
  • This technique provides a new tool to study the dynamic relationship between microglia and synapses.

Conclusions:

  • Microglia play a significant role in synaptic organization and plasticity.
  • The developed technique offers unprecedented opportunities to investigate microglia-synapse dynamics in physiological and pathological conditions.

Related Concept Videos

The Synapse02:47

The Synapse

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.
132.8K
Contact-dependent Signaling01:19

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
46.9K
Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
18.3K
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.
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...
11.3K
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.
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...
4.4K
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
10.3K