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Related Experiment Videos

Central nervous system lesions and segmental activity.

Sabine Meunier1, Rose Katz, Marion Simonetta-Moreau

  • 1Laboratoire de Neurophysiologie Clinique, Hĵpital de la Salpêtrière, Paris, France. meunier@chups.jussieu.fr

Advances in Experimental Medicine and Biology
|August 13, 2002
PubMed
Summary

Parkinsonian patients exhibit a loss of descending modulation in disynaptic Ia reciprocal inhibition (DI). This, along with enhanced group II excitation, may contribute to rigidity in Parkinson's disease (PD).

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Area of Science:

  • Neuroscience
  • Motor Control
  • Clinical Neurology

Background:

  • Disynaptic Ia reciprocal inhibition (DI) involves reciprocal connections between agonist and antagonist motoneurons.
  • Descending inputs modulate DI interneuron activity during movement.
  • Basal ganglia disorders, like Parkinson's disease (PD), affect motor control pathways.

Purpose of the Study:

  • To investigate the modulation of DI in Parkinsonian patients.
  • To explore the role of group II excitation in PD-related rigidity.
  • To identify potential neurochemical underpinnings of altered motor control in PD.

Main Methods:

  • Electrophysiological recordings in Parkinsonian patients and healthy controls.
  • Assessment of disynaptic Ia reciprocal inhibition (DI) during voluntary movement.

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  • Stimulation of the common peroneal nerve to evoke heteronymous group II excitation.
  • Evaluation of L-DOPA's effect on descending modulation.

    • Main Results:

    • Descending modulation of DI interneurons was virtually absent in Parkinsonian patients.
    • This lack of modulation persisted regardless of L-DOPA treatment.
    • A significant enhancement of group II excitation of quadriceps motoneurons was observed in Parkinsonian patients.
    • This enhancement was particularly pronounced in the rigid lower limb.

    Conclusions:

    • The loss of descending modulation of DI contributes to motor deficits in PD.
    • Enhanced group II excitation may be a key factor in Parkinsonian rigidity.
    • Altered tonic noradrenergic descending control from the locus coeruleus could underlie these changes.