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Synaptophysin in the developing cochlea.

P Gil-Loyzaga1, R Pujol

  • 1INSERM-U.254, Hôpital St. Charles, Montpellier, France.

International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience
|January 1, 1988
PubMed
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Synaptophysin, identified by SY38 antibody, appears in the inner spiral bundle and outer hair cells of developing rat and guinea-pig cochleas. This indicates its presence in efferent nerve endings during auditory system maturation.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory Science

Background:

  • Synaptophysin is a key protein in synaptic vesicle formation and neurotransmission.
  • Understanding the developmental expression of synaptophysin in the cochlea is crucial for deciphering auditory efferent system maturation.

Purpose of the Study:

  • To investigate the developmental expression and localization of synaptophysin (SY38 immunoreactivity) in the rat and guinea-pig cochlea.
  • To correlate synaptophysin presence with the maturation stages of cochlear efferent innervations.

Main Methods:

  • Immunohistochemistry using the anti-synaptophysin antibody (SY38) on cochlear tissues from developing rats and guinea-pigs.
  • Preliminary electron microscopy to confirm the subcellular localization of SY38 immunoreactivity.

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Main Results:

  • SY38 immunoreactivity was detected in the inner spiral bundle (ISB) of rat pups by postnatal day 3 and in outer hair cells (OHCs) by days 10-15.
  • In fetal guinea-pigs, ISB reactivity was observed at 45 days of gestation, with OHC reactivity appearing by day 62.
  • Electron microscopy localized SY38 to varicosities of efferent (olivo-cochlear) nerve endings.

Conclusions:

  • Synaptophysin is present in the cochlea at the termination sites of both medial and lateral efferent systems.
  • The temporal expression pattern of SY38 suggests that lateral efferent maturation precedes medial efferent maturation in the cochlea.