Overexpression of BUBR1 is associated with chromosomal instability in bladder cancer

Abstract 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, num...

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Published in:Cancer genetics and cytogenetics 2007-04, Vol.174 (1), p.42-47
Main Authors: Yamamoto, Yoshiaki, Matsuyama, Hideyasu, Chochi, Yasuyo, Okuda, Masaru, Kawauchi, Shigeto, Inoue, Ryo, Furuya, Tomoko, Oga, Atsunori, Naito, Katsusuke, Sasaki, Kohsuke
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Aneuploidy
Centrosome - metabolism
Chromosomal Instability - genetics
Female
Gene Expression
Hematology, Oncology and Palliative Medicine
Humans
Immunohistochemistry
Kaplan-Meier Estimate
Ki-67 Antigen - metabolism
Male
Medical Education
Middle Aged
Protein Kinases - genetics
Protein Kinases - metabolism
Protein-Serine-Threonine Kinases
Urinary Bladder Neoplasms - genetics
Urinary Bladder Neoplasms - pathology
Urothelium - metabolism
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Summary:Abstract 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.
ISSN:0165-4608
1873-4456
DOI:10.1016/j.cancergencyto.2006.11.012