Expression of Bub1 gene correlates with tumor proliferating activity in human gastric carcinomas - PubMed (original) (raw)
Comparative Study
doi: 10.1159/000048754.
Affiliations
- PMID: 11641614
- DOI: 10.1159/000048754
Comparative Study
Expression of Bub1 gene correlates with tumor proliferating activity in human gastric carcinomas
H Shigeishi et al. Pathobiology. 2001.
Abstract
Bub1 plays an important role at the spindle assembly checkpoint to prevent cell cycle progression following spindle damage. We examined the expression of human Bub1 mRNA in 20 gastric carcinoma tissues and corresponding nonneoplastic mucosas by reverse transcriptase-polymerase chain reaction and analyzed the relation with proliferative activity monitored by the expression of proliferating cell nuclear antigen (PCNA) on Western blotting as well as Ki-67 labeling index by immunohistochemistry. Increased expression of Bub1 mRNA was detected in 8 (40%) of the gastric carcinomas in comparison with their nonneoplastic counterparts, while 4 (20%) expressed Bub1 at lower levels. The expression of Bub1 mRNA was confirmed by in situ hybridization. The expression levels of Bub1 mRNA were well correlated with the levels of PCNA protein in 16 (80%) gastric carcinoma cases. The examination of Ki-67 labeling indices proved the close correlation between the expression levels of Bub1 and proliferating activity. These findings suggest that mRNA expression of human Bub1 gene is closely associated with the tumor-proliferating activity. Since genetic alterations of human Bub1 rarely occur in gastrointestinal cancers, the functional machinery of Bub1 to prevent cell cycle progression into anaphase might be well preserved in gastric carcinomas even with high proliferative activity.
Copyright 2001 S. Karger AG, Basel
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