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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

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Purinergic modulation of neuronal activity in developing auditory brainstem.

Beatrice Dietz1, Saša Jovanovic, Betty Wielsch

  • 1Biosciences, Pharmacy and Psychology, University of Leipzig, D-04103 Leipzig, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 3, 2012
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Purinergic signaling, mediated by extracellular ATP and P2X receptors, modulates auditory brainstem neuron activity during development. This signaling enhances action potential firing and plays a role in auditory circuit development.

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Area of Science:

  • Neuroscience
  • Auditory System Development
  • Purinergic Signaling

Background:

  • Spontaneous neuronal activity is crucial for nervous system development.
  • In the auditory system, ATP from the cochlea triggers action potentials (APs) transferred centrally.
  • Purinergic signaling's role beyond the cochlea is not fully understood.

Purpose of the Study:

  • To investigate the modulatory role of purinergic signaling in auditory brainstem neurons.
  • To assess the effects of P2X receptors (P2XRs) on neuronal excitability during auditory development.

Main Methods:

  • In vivo recordings in Mongolian gerbils from prehearing to early auditory processing stages.
  • Assessed the effects of P2X receptors (P2XRs) on neuronal excitability.
  • Examined ATP's effects on spontaneous and acoustically evoked activity.

Main Results:

  • Extracellular ATP evokes action potentials (APs) and Ca(2+) signals in P2XR-expressing neurons.
  • ATP increases spontaneous and evoked activity in cochlear nucleus (CN) bushy cells, diminishing with maturity.
  • ATP enhances glutamate-driven firing and evokes APs independently of glutamate.

Conclusions:

  • Endogenously released ATP in the CN contributes to neuronal firing by facilitating AP generation and prolonging duration.
  • P2XRs are confined to specific auditory brainstem nuclei and neurons.
  • Purinergic signaling likely plays a specific role in auditory brainstem circuit development.