title: Expression of DNA topoisomerase I, IIalpha, and IIbeta in human brain tumors.
abstract: We investigated the expression of DNA topoisomerase I (Topo I), IIalpha (Topo IIalpha), and IIbeta (Topo IIbeta) mRNA using reverse transcription-polymerase chain reaction (RT-PCR) assay in 31 human brain tumors, and examined the relationship between DNA topoisomerase mRNA expression and Topo IIalpha and MIB-1 positive index (PI) as a cell proliferation marker. Topo IIalpha mRNA was expressed in 11 of 31 cases, and Topo I and IIbeta were each expressed in 18 of 31 cases. A significant correlation was seen between the MIB-1 PI and Topo IIalpha PI (P < 0.001). The cases with overexpression of Topo IIalpha mRNA had significantly high MIB-1 and Topo IIalpha PI (P < 0.0001). There was no significant correlation between Topo I and IIbeta mRNA expression and MIB-1 PI. We concluded that it was useful as a cell proliferation marker to analyze the expression of Topo IIalpha mRNA using RT-PCR in human brain tumors.
authors.affiliation: Department of Neurological Surgery, Kagawa Medical University, Kitagun, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Morisaki
authors.forename: S
authors.initials: S
authors.lastname: Kuroda
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: K
authors.initials: K
authors.lastname: Kunishio
authors.forename: S
authors.initials: S
authors.lastname: Nagao
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000201:enzymology* / Q000473:pathology / Q000556:secondary; D002455:Cell Division; D004264:DNA Topoisomerases, Type I / Q000235:genetics / Q000378:metabolism*; D004250:DNA Topoisomerases, Type II / Q000235:genetics / Q000378:metabolism*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D007527:Isoenzymes; D012333:RNA, Messenger; D004264:DNA Topoisomerases, Type I; D004250:DNA Topoisomerases, Type II