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Modulation of calcium by inhibitory systems in the developing auditory midbrain

Y J Lo1, S C Rao, D H Sanes

  • 1Center for Neural Science, New York University, New York 10003, USA.

Neuroscience
|March 21, 1998
PubMed
Summary

Inhibitory synaptic transmission regulates calcium levels in developing auditory circuits. It can reduce calcium influx from excitatory synapses but may also cause a small influx when activated alone.

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Area of Science:

  • Neuroscience
  • Auditory system development
  • Synaptic plasticity

Background:

  • Inhibitory synaptic transmission is crucial for auditory circuit maturation.
  • Understanding its role in regulating intracellular calcium is key to auditory processing.

Purpose of the Study:

  • To investigate how inhibitory transmission modulates intracellular calcium in the gerbil inferior colliculus.
  • To explore the specific roles of GABA(A) and glycine receptors in this regulation.

Main Methods:

  • Used a gerbil brain slice preparation of the inferior colliculus.
  • Evoked postsynaptic potentials via electrical stimulation of ascending afferents.
  • Utilized pharmacological agents to isolate and manipulate inhibitory pathways and receptor activity.

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  • Measured intracellular calcium levels using ratiometric methods.

    • Main Results:

    • Pharmacologically isolated inhibitory potentials attenuated calcium rise induced by depolarization.
    • GABA(A) and glycine receptor antagonists increased neuronal calcium during afferent stimulation.
    • GABA(A) receptor activation (GABA, muscimol) caused depolarization and a transient calcium increase.
    • GABA(B) receptor activation (baclofen) had no effect on membrane potential or calcium.

    Conclusions:

    • Inhibitory synaptic transmission actively regulates postsynaptic calcium during development.
    • It can attenuate excitatory calcium influx and, when activated alone, induce a modest calcium influx.
    • These mechanisms contribute to the development of postsynaptic properties in the auditory system.