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Nitric oxide mediates activity-dependent synaptic suppression at developing neuromuscular synapses

T Wang1, Z Xie, B Lu

  • 1Roche Institute of Molecular Biology, Nutley, New Jersey 07110.

Nature
|March 16, 1995
PubMed
Summary
This summary is machine-generated.

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Nitric oxide (NO) acts as a retrograde signal to suppress neuromuscular synapses when postsynaptic activity is asynchronous to presynaptic firing. This finding reveals a molecular mechanism for activity-dependent synaptic suppression.

Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Developmental Biology

Background:

  • Synaptic activity correlation is key to synaptic development and plasticity.
  • Postsynaptic activity in developing neuromuscular junctions suppresses and eliminates synapses.
  • The molecular basis for activity-dependent synaptic suppression remains unclear.

Purpose of the Study:

  • To investigate the molecular mechanism of activity-dependent synaptic suppression at the neuromuscular junction.
  • To determine if nitric oxide (NO) acts as a retrograde signal in this process.

Main Methods:

  • Utilized NO donors and cyclic GMP pathway activators to observe effects on synaptic currents.
  • Investigated the impact of repetitive postsynaptic depolarization on synaptic suppression.

Related Experiment Videos

  • Employed NO-binding protein (haemoglobin) and NO synthase inhibitors to block NO signaling.

    • Main Results:

    • NO donors and cyclic GMP pathway activators suppressed spontaneous and evoked synaptic currents.
    • Repetitive postsynaptic depolarization led to synaptic suppression.
    • Synaptic suppression was blocked by haemoglobin and NO synthase inhibitors, implicating NO.

    Conclusions:

    • Nitric oxide (NO) serves as a retrograde signal for activity-dependent synaptic suppression at the neuromuscular synapse.
    • Asynchronous postsynaptic firing triggers NO release, leading to synaptic suppression.
    • This mechanism is crucial for regulating synaptic connectivity during development and plasticity.