title: Characterizing invading glioma cells based on IDH1-R132H and Ki-67 immunofluorescence.
abstract: Glioma, the most common primary brain tumor, is characterized by proliferative-invasive growth. However, the detailed biological characteristics of invading glioma cells remain to be elucidated. A monoclonal antibody (clone HMab-1) that specifically and sensitively recognizes the isocitrate dehydrogenase-1 (IDH1) protein carrying the R132H mutation can identify invading glioma cells by immunostaining. To investigate the degree of invasion in gliomas of distinct grades and the proliferative capacity of the invading cells, immunofluorescent staining was conducted using antibodies against IDH1-R132H and Ki-67 on 11 surgical and autopsy specimens of the tumor core and the invading area. Higher numbers of IDH1-R132H-positive cells in the invading area correlated with a higher tumor grade. Double staining for IDH1-R132H and Ki-67 demonstrated that most invading cells that expressed IDH1-R132H were not stained by the Ki-67 antibody, and the ratio of Ki-67-positive cells among IDH1-R132H-positive cells was significantly lower in the invasion area than in the tumor core in all grades of glioma. These data suggest that higher grade gliomas have a greater invasive potential and that invading cells possess low proliferative capacity.
authors.affiliation: Department of Neurosurgery, Division of Neuroscience, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan.
authors.forename: Hemragul
authors.initials: H
authors.lastname: Sabit
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Nakada
authors.forename: Takuya
authors.initials: T
authors.lastname: Furuta
authors.forename: Takuya
authors.initials: T
authors.lastname: Watanabe
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sato
authors.forename: Yukinari
authors.initials: Y
authors.lastname: Kato
authors.forename: Jun-ichiro
authors.initials: J
authors.lastname: Hamada
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000235:genetics* / Q000473:pathology*; D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D005260:Female; D005455:Fluorescent Antibody Technique; D005910:Glioma / Q000235:genetics* / Q000473:pathology*; D006801:Humans; D007521:Isocitrate Dehydrogenase / Q000032:analysis* / Q000235:genetics; D019394:Ki-67 Antigen / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D009154:Mutation; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D055815:Young Adult
chemical_list: D019394:Ki-67 Antigen; D007521:Isocitrate Dehydrogenase; C543588:IDH1 protein, human