Peripheral and central target-derived trophic factor(s) effects on auditory neurons

Philippe P. Lefebvre, Thierry Weber, Jean Michel Rigo, Hinrich Staecker, Gustave Moonen, Thomas R. Van De Water

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53 Scopus citations


In the developing inner ear, a naturally occurring programmed cell death of cochleovestibular ganglion (CVG) neurons as well as peripheral and central target-derived trophic effects on survival of embryonic CVG neurons are known. To further analyze these target derived trophic interactions, spiral ganglion explants obtained from 5 day postpartum (P5) rat pups were cultured with an intact organ of Corti and in the absence of Corti's organ. Both neuronal survival and neurite extension were influenced by the presence of this peripheral target tissue. Local destruction of Corti's organ caused both neuritic retraction and neuronal cell death to occur in a corresponding portion of the spiral ganglion. This peripheral target-derived neurotrophic effect may be mediated by a diffusible factor(s) since organ of Corti conditioned medium also had a neurotrophic effect on the survival of auditory neurons in cell cultures of dissociated spiral ganglia from P5 rat pups. A component of central target tissue, i.e. astrocytes, was also shown to release a diffusible factor(s) that supported the survival of dissociated P5 rat spiral ganglion neurons. The neurotrophic effects on the in vivo survival of spiral ganglion neurons by both of these conditioned medium factors were concentration dependent.

Original languageEnglish (US)
Pages (from-to)185-192
Number of pages8
JournalHearing Research
Issue number2
StatePublished - Mar 1992


  • Astrocytes
  • Conditioned medium
  • Neuronotrophic effects
  • Organ of Corti

ASJC Scopus subject areas

  • Sensory Systems


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