title: Overexpression of polo-like kinase 1 (PLK1) and chromosomal instability in bladder cancer.
abstract: Polo-like kinase 1 (PLK1) participates in bipolar spindle formation and entry into mitosis. Chromosomal instability (CIN) is caused by abnormalities in spindle formation and chromosome segregation. In this study, we investigated the relationship of PLK1 overexpression to CIN, and compared the PLK1 status with clinicopathological parameters in 101 human urothelial carcinomas of the urinary bladder. Expression of PLK1 and the number of centrosomes were assessed by immunohistochemistry. Numerical aberrations of chromosomes 7, 9 and 17 spots that allowed estimation of CIN were evaluated by fluorescence in situ hybridization, and DNA ploidy was assessed by laser scanning cytometry. Cancers with a large intercellular variation in centromere copy number were defined as CIN cancers. Tumors with PLK1 overexpression were associated more frequently with CIN (p < 0.0001), DNA aneuploidy (p = 0.0007) and centrosome amplification (p = 0.0013) than those without. Overexpression of PLK1 was significantly related to higher pathological grade (p = 0.0024), multiple tumors (p = 0.0241) and positive urine cytology (p = 0.0192). These data suggest that a high level expression of PLK1 confers tumor progression advantages to urothelial cancer cells, although other factors are also involved.
authors.affiliation: Department of Urology, Yamaguchi University School of Medicine, Ube, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Hideyasu
authors.initials: H
authors.lastname: Matsuyama
authors.forename: Shigeto
authors.initials: S
authors.lastname: Kawauchi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Matsumoto
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Nagao
authors.forename: Chietaka
authors.initials: C
authors.lastname: Ohmi
authors.forename: Shigeru
authors.initials: S
authors.lastname: Sakano
authors.forename: Tomoko
authors.initials: T
authors.lastname: Furuya
authors.forename: Atsunori
authors.initials: A
authors.lastname: Oga
authors.forename: Katsusuke
authors.initials: K
authors.lastname: Naito
authors.forename: Kohsuke
authors.initials: K
authors.lastname: Sasaki
mesh_terms: D000328:Adult; D000368:Aged; D000782:Aneuploidy; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D018385:Centrosome; D043171:Chromosomal Instability; D018572:Disease-Free Survival; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D017404:In Situ Hybridization, Fluorescence; D047569:Laser Scanning Cytometry; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000235:genetics / Q000473:pathology; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D015854:Up-Regulation; D001749:Urinary Bladder Neoplasms / Q000201:enzymology / Q000235:genetics* / Q000473:pathology*; D002578:Uterine Cervical Dysplasia / Q000201:enzymology / Q000235:genetics* / Q000473:pathology*; D000097869:Polo-Like Kinase 1
chemical_list: D018797:Cell Cycle Proteins; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D000097869:Polo-Like Kinase 1