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Related Experiment Videos

Disuse enhances synaptic efficacy in spinal mononeurones.

R Gallego, M Kuno, R Núñez

    The Journal of Physiology
    |June 1, 1979
    PubMed
    Summary

    Peripheral nerve injury reduces synaptic strength, but prolonged sensory disuse actually increases it. This study investigates the impact of nerve section and conduction block on synaptic efficacy in cats.

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    Area of Science:

    • Neuroscience
    • Synaptic Plasticity
    • Motor Neuron Physiology

    Background:

    • Peripheral nerve injury can lead to changes in synaptic transmission.
    • The role of sensory input activity (or lack thereof) in modulating central synaptic efficacy is not fully understood.

    Purpose of the Study:

    • To investigate the effects of peripheral nerve section and chronic conduction block on monosynaptic excitatory post-synaptic potentials (e.p.s.p.s) in cat motoneurons.
    • To determine if reduced impulse activity (disuse) contributes to decreased central synaptic transmission after nerve injury.
    • To examine the impact of prolonged sensory fiber disuse on synaptic efficacy.

    Main Methods:

    • Recording of monosynaptic excitatory post-synaptic potentials (e.p.s.p.s) in triceps surae motoneurons of cats.
    • Induction of peripheral nerve changes: section or chronic conduction block (using tetrodotoxin) of the medial gastrocnemius (m.g.) nerve.
    • Stimulation of intact synergistic nerves (lateral gastrocnemius and soleus) to evoke heteronymous e.p.s.p.s.
    • Daily stimulation of the sciatic nerve to assess its effect on synaptic transmission.

    Main Results:

    • Section of the m.g. nerve led to a significant reduction in homonymous and heteronymous e.p.s.p. amplitudes within 1-2 weeks.
    • Stimulation of intact synergistic nerves did not alter e.p.s.p. amplitudes in motoneurons receiving input from the sectioned nerve.
    • Daily sciatic nerve stimulation did not prevent the reduction in e.p.s.p. amplitudes following m.g. nerve section.
    • Chronic conduction block of the m.g. nerve with tetrodotoxin (TTX) resulted in a significant increase in homonymous e.p.s.p. amplitude.

    Conclusions:

    • Decreased central synaptic transmission after peripheral nerve section is not solely due to the elimination of impulse activity (disuse).
    • Prolonged disuse of sensory fibers appears to increase, rather than decrease, central synaptic efficacy.
    • These findings challenge the simple disuse hypothesis and suggest a more complex adaptive mechanism in synaptic plasticity following nerve injury.

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