Overexpression of Separase induces aneuploidy and mammary tumorigenesis.
Proc Natl Acad Sci U S A
; 105(35): 13033-8, 2008 Sep 02.
Article
em En
| MEDLINE
| ID: mdl-18728194
ABSTRACT
Separase is an endopeptidase that separates sister chromatids by cleaving cohesin Rad21 during the metaphase-to-anaphase transition. Conditional expression of Separase in tetracycline-inducible diploid FSK3 mouse mammary epithelial cells with both p53 WT and mutant (Ser-233-234) alleles of unknown physiological significance develops aneuploidy within 5 days of Separase induction in vitro. Overexpression of Separase induces premature separation of chromatids, lagging chromosomes, and anaphase bridges. In an in vivo mouse mammary transplant model, induction of Separase expression in the transplanted FSK3 cells for 3-4 weeks results in the formation of aneuploid tumors in the mammary gland. Xenograft studies combined with histological and cytogenetic analysis reveal that Separase-induced tumors are clonal in their genomic complements and have a mesenchymal phenotype suggestive of an epithelial-mesenchymal transition. Induction of Separase resulted in trisomies for chromosomes 8, 15, and 17; monosomy for chromosome 10; and amplification of the distal region of chromosomes 8 and 11. Separase protein is found to be significantly overexpressed in human breast tumors compared with matched normal tissue. These results collectively suggest that Separase is an oncogene, whose overexpression alone in mammary epithelial cells is sufficient to induce aneuploidy and tumorigenesis in a p53 mutant background.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Endopeptidases
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Neoplasias da Mama
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Proteínas de Ciclo Celular
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Aneuploidia
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Neoplasias Mamárias Experimentais
Limite:
Animals
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Female
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Humans
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article