Occurrence of multipolar mitoses and association with Aurora-A/-B kinases and p53 mutations in aneuploid esophageal carcinoma cells

被引:34
作者
Fichter, Christiane D. [1 ]
Herz, Corinna [1 ,3 ]
Muenich, Claudia [1 ]
Opitz, Oliver G. [2 ]
Werner, Martin [1 ]
Lassmann, Silke [1 ]
机构
[1] Univ Med Ctr, Inst Pathol, Freiburg, Germany
[2] Univ Med Ctr, Tumorzentrum Ludwig Heilmeyer, Ctr Comprehens Canc, Freiburg, Germany
[3] Univ Med Ctr Freiburg, Dept Environm Hlth Sci, Freiburg, Germany
来源
BMC CELL BIOLOGY | 2011年 / 12卷
关键词
COMPARATIVE GENOMIC HYBRIDIZATION; CENTROSOME AMPLIFICATION; CHROMOSOMAL INSTABILITY; GENETIC ALTERATIONS; BARRETTS-ESOPHAGUS; AURORA-A/STK15/BTAK EXPRESSION; MISSENSE MUTATION; TUMOR-CELLS; CANCER; OVEREXPRESSION;
D O I
10.1186/1471-2121-12-13
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Background: Aurora kinases and loss of p53 function are implicated in the carcinogenesis of aneuploid esophageal cancers. Their association with occurrence of multipolar mitoses in the two main histotypes of aneuploid esophageal squamous cell carcinoma (ESCC) and Barrett's adenocarcinoma (BAC) remains unclear. Here, we investigated the occurrence of multipolar mitoses, Aurora-A/-B gene copy numbers and expression/activation as well as p53 alterations in aneuploid ESCC and BAC cancer cell lines. Results: A control esophageal epithelial cell line (EPC-hTERT) had normal Aurora-A and -B gene copy numbers and expression, was p53 wild type and displayed bipolar mitoses. In contrast, both ESCC (OE21, Kyse-410) and BAC (OE33, OE19) cell lines were aneuploid and displayed elevated gene copy numbers of Aurora-A (chromosome 20 polysomy: OE21, OE33, OE19; gene amplification: Kyse-410) and Aurora-B (chromosome 17 polysomy: OE21, Kyse-410). Aurora-B gene copy numbers were not elevated in OE19 and OE33 cells despite chromosome 17 polysomy. Aurora-A expression and activity (Aurora-A/phosphoT288) was not directly linked to gene copy numbers and was highest in Kyse-410 and OE33 cells. Aurora-B expression and activity (Aurora-B/phosphoT232) was higher in OE21 and Kyse-410 than in OE33 and OE19 cells. The mitotic index was highest in OE21, followed by OE33 > OE19 > Kyse-410 and EPC-hTERT cells. Multipolar mitoses occurred with high frequency in OE33 (13.8 +/- 4.2%), followed by OE21 (7.7 +/- 5.0%) and Kyse-410 (6.3 +/- 2.0%) cells. Single multipolar mitoses occurred in OE19 (1.0 +/- 1.0%) cells. Distinct p53 mutations and p53 protein expression patterns were found in all esophageal cancer cell lines, but complete functional p53 inactivation occurred in OE21 and OE33 only. Conclusions: High Aurora-A expression alone is not associated with overt multipolar mitoses in aneuploid ESCC and BAC cancer cells, as specifically shown here for OE21 and OE33 cells, respectively. Additional p53 loss of function mutations are necessary for this to occur, at least for invasive esophageal cancer cells. Further assessment of Aurora kinases and p53 interactions in cells or tissue specimens derived from non-invasive dysplasia (ESCC) or intestinal metaplasia (BAC) are necessary to disclose a potential causative role of Aurora kinases and p53 for development of aneuploid, invasive esophageal cancers.
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