Overexpression of BUBR1 is associated with chromosomal instability in bladder cancer.
BUBR1, a mitotic checkpoint protein, is a key component of the mitotic spindle checkpoint machinery. Defective BUBR1 has been proposed to contribute to chromosomal instability (CIN). To elucidate the relationship of BUBR1 expression with CIN, expression of BUBR1, numbers of centrosomes, numerical aberrations of chromosomes, and DNA ploidy were examined, and BUBR1 expression status was compared with clinicopathological parameters in 104 human urothelial bladder carcinomas. Expression of BUBR1 and numbers of centrosomes were assessed by immunohistochemistry. Numerical aberrations of chromosomes 7, 9, and 17 were evaluated by fluorescence in situ hybridization. Cancers with a large intercellular variation in centromere copy number were designated as CIN cancers. Tumors with BUBR1 overexpression were associated with CIN, DNA aneuploidy, and centrosome amplification. Array CGH revealed that BUB1B amplification and loss rarely occurred, indicating that the overexpression of BUBR1 in these bladder cancers was independent of BUB1B copy number. Overexpression of BUBR1 significantly correlated with higher histological grade, advanced pathological stage, and high cell proliferation. Overexpression of BUBR1 predicted tumor recurrence and disease progression. These data suggest that overexpression of BUBR1 is potentially a new tumor marker for estimating biological characteristics of bladder cancer.
Yamamoto
Yoshiaki
Y
Department of Urology, Yamaguchi University School of Medicine, Ube 755-8505, Yamaguchi, Japan.
Matsuyama
Hideyasu
H
Chochi
Yasuyo
Y
Okuda
Masaru
M
Kawauchi
Shigeto
S
Inoue
Ryo
R
Furuya
Tomoko
T
Oga
Atsunori
A
Naito
Katsusuke
K
Sasaki
Kohsuke
K
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000782:Aneuploidy; D018385:Centrosome / Q000378:metabolism; D043171:Chromosomal Instability / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D053208:Kaplan-Meier Estimate; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D011494:Protein Kinases / Q000235:genetics* / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases; D001749:Urinary Bladder Neoplasms / Q000235:genetics* / Q000473:pathology; D019459:Urothelium / Q000378:metabolism
D019394:Ki-67 Antigen; D011494:Protein Kinases; C584277:BUB1 protein, human; C090464:Bub1 spindle checkpoint protein; D017346:Protein Serine-Threonine Kinases