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Acute Cortical Stroke Alters Neural Activity in Subthalamic Nucleus, Which Correlates With Motor Disability in Rats.

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Summary

Acute cortical stroke (ACS) in rats caused reduced subthalamic nucleus (STN) activity and abnormal brain oscillations, leading to motor disability. These STN changes predict motor deficits after stroke.

Keywords:
forelimbischemic strokemotor cortexmovementsubthalamic nucleus

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Area of Science:

  • Neuroscience
  • Stroke Research
  • Motor Control

Background:

  • The subthalamic nucleus (STN) is crucial for motor control.
  • The effects of acute cortical stroke (ACS) on STN activity and neural oscillations are not well understood.
  • The relationship between STN neurophysiological changes and motor impairment post-stroke is unknown.

Purpose of the Study:

  • To investigate the impact of ACS on STN neural activity and oscillations.
  • To determine the correlation between STN neurophysiological changes and motor disability after stroke.

Main Methods:

  • Photothrombotic lesions were induced in the motor cortex of 44 rats to simulate ACS.
  • Local field potentials were recorded from the STN before and after lesion induction.
  • Motor behavior was assessed using a single-pellet reaching task.

Main Results:

  • ACS led to significant motor disability in rats.
  • STN firing rate and delta/gamma power decreased post-ACS.
  • Decreased delta and gamma power correlated with reduced motor task success rates.
  • Decreased gamma power correlated with reduced STN firing rate.

Conclusions:

  • ACS induces subthalamic inhibition and abnormal oscillations in rats, correlating with motor disability.
  • Abnormal STN oscillations can serve as a biomarker for acute motor deficits post-stroke.
  • Neuromodulation targeting STN activity may mitigate post-stroke motor impairments.