Distribution of calcitonin gene-related peptide immunoreactivity in vestibular efferents neurons of the chinchilla

Rex A. Wong Marco, Larry F. Hoffman, Phillip A. Wackym, Paul E. Micevych, Paul Popper

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The distribution of calcitonin gene-related peptide immunoreactivity (CGRPi) within efferent vestibular neurons in the chinchilla was investigated using fluorescent retrograde labeling combined with immunohistochemistry. Efferent vestibular neurons were found bilaterally in clusters: dorsolateral (group E1) and medial (group E2) to the genu of CN VII, as well as ventromedial to the descending CN VII fibers in the parvicellular reticular formation (PCR). The percentage of retrogradely labeled cells containing CGRPi was 77.1 ± 5.7 for group E1 neurons, 90.3 ± 3.8 in the E2 region. Among the PCR efferents more then half of the neurons (61.4 ± 19.9%) expressed CGRP peptide or message. The wide distribution of CGRP among vestibular efferents neurons suggests that CGRP plays an important role in vestibular efferent function. In addition, the differential distribution among the groups of vestibular efferents neurons suggests that efferent modulation of vestibular function is different between the E cell group efferent neurons and the PCR efferent neurons.

Original languageEnglish (US)
Pages (from-to)95-101
Number of pages7
JournalHearing Research
Volume97
Issue number1-2
DOIs
StatePublished - Aug 1996

Keywords

  • Calcitonin gene-related peptide
  • Immunohistochemistry
  • In-situ hybridization
  • Vestibular efferent

ASJC Scopus subject areas

  • Sensory Systems

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