title: Immunohistochemistry of displaced sensory neurons in the trigeminal nerve root.
abstract: The aim of this study was to examine the morphology and the immunohistochemical features of displaced ganglion cells in the trigeminal nerve root (TNR). Forty human TNRs of 20 persons, obtained during routine autopsy in accordance with the Declaration of Helsinki, were examined following Klüver-Barrera and azan trichrome histological staining, and immunohistochemical reactions against certain neuronal markers, neuropeptides and neurotransmitters. A total number of 61 displaced neurons were investigated, which were present in 80% of individuals studied. Displaced neurons were found in 55.0% of the TNRs, either in the sensory portion (22.5%), motor portion (22.5%) or both (10.0%). Neuronal diameter varied from 12.5 x 25.0 to 45.0 x 63.7 (mean 27.6 x 41.6) microm, and in area between 245 and 2,065 (mean 927) microm(2). Each neuron was surrounded by 2-17 elongated satellite cells per slice. The immune reaction was positive in all the neurons studied for neuron-specific enolase, protein gene product 9.5, neurofilament protein and synaptophysin, and in some neurons for calcitonin gene-related peptide (CGRP; 24.4%), cholecystokinin (CCK; 13.3%), somatostatin (SST; 17.8%), substance P (SP; 15.6%), vasoactive intestinal polypeptide (4.4%), neuropeptide Y (8.9%), and serotonin (11.1%). The immune reactions were most frequent against the CGRP, SP, CCK and SST. We concluded that displaced neurons in the TNR morphologically and immunohistochemically resembled the sensory neurons in the trigeminal ganglion.
authors.affiliation: Institute of Anatomy, University School of Medicine, Belgrade, Serbia.
authors.forename: Slobodan
authors.initials: S
authors.lastname: Marinković
authors.forename: Mila
authors.initials: M
authors.lastname: Cetković
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Gibo
authors.forename: Vera
authors.initials: V
authors.lastname: Todorović
authors.forename: Jasna
authors.initials: J
authors.lastname: Jancić
authors.forename: Milan
authors.initials: M
authors.lastname: Milisavljević
mesh_terms: D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism; D002766:Cholecystokinin / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D009479:Neuropeptides / Q000378:metabolism; D011984:Sensory Receptor Cells / Q000166:cytology / Q000378:metabolism*; D013004:Somatostatin / Q000378:metabolism; D014276:Trigeminal Nerve / Q000166:cytology*; D014660:Vasoactive Intestinal Peptide / Q000378:metabolism
chemical_list: D009479:Neuropeptides; D014660:Vasoactive Intestinal Peptide; D013004:Somatostatin; D002766:Cholecystokinin; D015740:Calcitonin Gene-Related Peptide