Absence of telomerase and shortened telomeres have minimal effects on skin and pancreatic carcinogenesis elicited by viral oncogenes.
Cancer Cell
; 6(4): 373-85, 2004 Oct.
Article
em En
| MEDLINE
| ID: mdl-15488760
ABSTRACT
The telomere-stabilizing enzyme telomerase is induced in tumors and functionally associated with unlimited replicative potential. To further explore its necessity, transgenic mice expressing SV40 or HPV16 oncogenes, which elicit carcinomas in pancreas and skin, respectively, were rendered telomerase-deficient. Absence of telomerase had minimal impact on tumorigenesis, even in terc(-/-) generations (G5-7) exhibiting shortened telomeres and phenotypic abnormalities in multiple organs. Analyses of chromosomal aberrations were not indicative of telomere dysfunction or increased genomic instability in tumors. Quantitative image analysis of telomere repeat intensities comparing biopsies of skin hyperplasia, dysplasia, and carcinoma revealed that telomere numbers and relative lengths were maintained during progression, implicating a means for preserving telomere repeats and functionality in the absence of telomerase.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Pancreáticas
/
Neoplasias Cutâneas
/
Proteínas Oncogênicas Virais
/
Telômero
/
Telomerase
Limite:
Animals
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article