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Exercise Reverses Behavioral and Synaptic Abnormalities after Maternal Inflammation.

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Voluntary exercise, like wheel running, can reverse abnormal behaviors and synaptic issues in a mouse model of neurodevelopmental disorders. This physical activity normalizes brain cell connections by enhancing microglial function.

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Developmental Biology

Background:

  • Neurodevelopmental disorders often involve persistent behavioral abnormalities.
  • Maternal immune activation (MIA) is a risk factor for neurodevelopmental disorders in offspring.
  • Synaptic abnormalities, particularly excessive CA3 synapses in the hippocampus, are observed in MIA models.

Purpose of the Study:

  • To investigate the potential of voluntary exercise to ameliorate behavioral and synaptic deficits in a mouse model of MIA-induced neurodevelopmental disorder.
  • To elucidate the cellular and synaptic mechanisms underlying exercise's effects.

Main Methods:

  • Utilized a mouse model of maternal immune activation (MIA).
  • Assessed behavioral abnormalities including sociability, repetitiveness, and anxiety.
  • Analyzed hippocampal synaptic density and microglial engulfment activity.
  • Employed chemogenetics to manipulate granule cell activity.

Main Results:

  • Voluntary wheel running significantly improved sociability, reduced repetitiveness, and decreased anxiety in MIA offspring.
  • Exercise normalized the excessive density of hippocampal CA3 synapses in MIA mice.
  • Exercise enhanced microglial engulfment of synapses, correcting deficits caused by MIA.
  • Activation of dentate granule cells promoted synapse engulfment.

Conclusions:

  • Voluntary exercise is a viable strategy to reverse behavioral and synaptic abnormalities in a neurodevelopmental disorder model.
  • Exercise-induced improvements are mediated by the normalization of hippocampal synaptic architecture via microglial activation.
  • Targeting granule cell activity may offer therapeutic potential for neurodevelopmental disorders.