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Updated: Oct 4, 2025

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Physiological synaptic activity and recognition memory require astroglial glutamine.

Giselle Cheung1,2, Danijela Bataveljic1,3, Josien Visser1,4

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|February 9, 2022
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Summary
This summary is machine-generated.

Astrocytes supply glutamine to neurons for synaptic function and memory. This activity-dependent process, mediated by connexin43, is crucial for healthy brain activity and cognitive processes.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Presynaptic glutamate replenishment is vital for brain function, especially during high activity.
  • The glutamate-glutamine cycle involving astrocytes and neurons is implicated, but astroglial glutamine supply in vivo remains debated.
  • Lack of tools to track glutamine transfer has hindered understanding.

Purpose of the Study:

  • To visualize and confirm activity-dependent glutamine transfer from astrocytes to presynaptic terminals in live cells.
  • To investigate the role of astroglial glutamine in physiological synaptic activity and memory formation.
  • To elucidate the molecular mechanisms, specifically the involvement of connexin43, in this process.

Main Methods:

  • Development of a novel fluorescent probe to track glutamine in live cells.
  • In vivo experiments to observe glutamine dynamics under physiological conditions.
  • Assessment of synaptic transmission and object recognition memory in relation to glutamine supply.

Main Results:

  • Direct visual evidence of activity-dependent glutamine supply from astroglial networks to presynaptic structures.
  • Connexin43 (Cx43) was identified as the mediator of this glutamine mobilization.
  • This astroglial glutamine supply is essential for normal synaptic transmission and object recognition memory.

Conclusions:

  • Astrocytes provide an indispensable, activity-dependent glutamine supply to neurons via an unconventional pathway.
  • Connexin43 plays a critical role in mediating this astroglial glutamine transfer.
  • This mechanism forms an astrocyte basis for cognitive processes like memory.