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Dynamic changes in cortical neurotrophic factor-positive interneurons during sleep.

Christine M Muheim1, Marcos G Frank2,3

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Neuroprotective factor-positive (NDNF+) inhibitory interneurons (INs) are active during REM sleep. Their activity decreases after sleep deprivation, suggesting a role in sleep regulation.

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Cortical Circuitry

Background:

  • Mammalian sleep involves significant changes in cortical neuron activity, shaping electroencephalographic (EEG) rhythms.
  • Inhibitory interneurons (INs) modulate these rhythms through direct inhibition and IN-IN interactions, crucial for understanding sleep's impact on cortical circuits.

Purpose of the Study:

  • Investigate the activity patterns of neuroprotective factor-positive (NDNF+) inhibitory interneurons (INs) during natural sleep and following sleep deprivation.
  • Elucidate the role of NDNF+ INs in cortical EEG activity and sleep regulation.

Main Methods:

  • Utilized genetically encoded calcium imaging (GECI) in freely behaving mice.
  • Combined GECI with miniature head-mounted cameras and polysomnography for comprehensive data acquisition.

Main Results:

  • NDNF+ INs exhibited peak activity during rapid-eye-movement (REM) sleep.
  • A significant decrease in NDNF+ IN activity was observed after total sleep deprivation.

Conclusions:

  • NDNF+ INs are dynamically regulated during sleep and show altered activity in response to sleep loss.
  • These findings suggest NDNF+ INs play a role in cortical EEG generation during REM sleep and in adaptive responses to sleep deprivation.