Peptide 19 in the rat vagal and glossopharyngeal sensory ganglia

H. Ichikawa, T. Sugimoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Peptide 19 (PEP 19) is a 7.6-kDa polypeptide which binds to calmodulin and inhibits calcium-calmodulin signaling. In this study, PEP 19-immunoreactivity (PEP 19-IR) was examined in the rat vagal and glossopharyngeal sensory ganglia. Twenty-nine percent, 59%, and 41% of sensory neurons contained PEP 19-IR in the jugular, petrosal, and nodose ganglia, respectively. These neurons were of various sizes (jugular, mean ± SD = 635.8 ± 392.6 μm 2, range = 105.9-1695.9 μm2; petrosal, mean ± SD = 370.9 ± 228.5 μm2, range = 57.7-1662.7 μm 2; nodose, mean ± SD = 380.5 ± 157 μm2, range = 87.5-950.4 μm2) and scattered throughout these ganglia. Double immunofluorescence method revealed that PEP 19-IR neurons which had parvalbumin-IR were rare in the ganglia (jugular, 4%; petrosal, 10%; nodose, 8%). PEP 19-IR neurons which contained calbindin D-28k were abundant in the petrosal (20%) and nodose (22%) ganglia but not in the jugular ganglion (8%). Retrograde tracing method indicated that many PEP 19-IR neurons projected to the circumvallate papilla and soft palate. In the soft palate, taste buds were innervated by PEP 19-IR nerve fibers. The present study suggests that PEP 19-IR neurons include chemoreceptors in the vagal and glossopharyngeal sensory ganglia.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalBrain Research
Issue number1
Publication statusPublished - Mar 15 2005
Externally publishedYes


  • Calbindin D-28k
  • Jugular ganglion
  • Nodose ganglion
  • Parvalbumin
  • Peptide 19
  • Petrosal ganglion

ASJC Scopus subject areas

  • General Neuroscience
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology


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