title: Calretinin-containing neurons which co-express parvalbumin and calbindin D-28k in the rat spinal and cranial sensory ganglia; triple immunofluorescence study.
abstract: The co-expression of calretinin with parvalbumin and calbindin D-28k was examined in the rat cranial and spinal sensory ganglia by triple immunofluorescence method. In the trigeminal and nodose ganglia, 9% and 5% of calretinin-immunoreactive neurons, respectively, also contained both parvalbumin- and calbindin D-28k immunoreactivity. These neurons had large cell bodies. In the trigeminal ganglion, they were restricted to the caudal portion. Such neurons were evenly distributed throughout the nodose ganglion. The co-expression could not be detected in the dorsal root, jugular or petrosal ganglia. Nerve fibers which co-expressed all the three calcium-binding proteins were observed in the inferior alveolar nerve but not the infraorbital nerve or palate. In the periodontal ligament, these nerve fibers formed Ruffini-like endings. These findings suggest that (1) the co-expression in trigeminal neurons is intimately related to their peripheral receptive fields; (2) the three calcium-binding proteins (calretinin, parvalbumin, calbindin D-28k) co-expressed in the trigeminal neurons may have mechanoreceptive function in the periodontal ligament.
authors.affiliation: Department of Oral Function and Anatomy, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8525, Japan. hiroichi@md.okayama-u.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Ichikawa
authors.forename: H W
authors.initials: HW
authors.lastname: Jin
authors.forename: R
authors.initials: R
authors.lastname: Terayama
authors.forename: T
authors.initials: T
authors.lastname: Yamaai
authors.forename: D M
authors.initials: DM
authors.lastname: Jacobowitz
authors.forename: T
authors.initials: T
authors.lastname: Sugimoto
mesh_terms: D000818:Animals; D064032:Calbindin 2; D064026:Calbindins; D019084:Fluorescent Antibody Technique, Indirect; D017950:Ganglia, Sensory / Q000378:metabolism*; D005727:Ganglia, Spinal / Q000166:cytology / Q000378:metabolism; D008297:Male; D008465:Mechanoreceptors / Q000502:physiology; D009412:Nerve Fibers / Q000378:metabolism; D009474:Neurons / Q000502:physiology*; D009620:Nodose Ganglion / Q000166:cytology / Q000378:metabolism; D010320:Parvalbumins / Q000096:biosynthesis*; D010513:Periodontal Ligament / Q000294:innervation / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D064030:S100 Calcium Binding Protein G / Q000096:biosynthesis* / Q000502:physiology*; D013116:Spinal Cord / Q000378:metabolism*; D012668:Trigeminal Ganglion / Q000166:cytology / Q000378:metabolism
chemical_list: C576512:Calb2 protein, rat; D064032:Calbindin 2; D064026:Calbindins; D010320:Parvalbumins; D064030:S100 Calcium Binding Protein G