Absence of cancer-associated changes in human fibroblasts immortalized with telomerase.
Nat Genet
; 21(1): 115-8, 1999 Jan.
Article
em En
| MEDLINE
| ID: mdl-9916803
ABSTRACT
The ectopic expression of telomerase in normal human cells results in an extended lifespan, indicating that telomere shortening regulates the timing of cellular senescence. As telomerase expression is a hallmark of cancer, we investigated the long-term effects of forced expression of human telomerase catalytic component (hTERT) in normal human fibroblasts. In vitro growth requirements, cell-cycle checkpoints and karyotypic stability in telomerase-expressing cells are similar to those of untransfected controls. In addition, co-expression of telomerase, the viral oncoproteins HPV16 E6/E7 (which inactivate p53 and pRB) and oncogenic HRAS does not result in growth in soft agar. Thus, although ectopic expression of telomerase in human fibroblasts is sufficient for immortalization, it does not result in changes typically associated with malignant transformation.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas Repressoras
/
RNA
/
Proteínas
/
Senescência Celular
/
Telomerase
/
Domínio Catalítico
/
Fibroblastos
Idioma:
En
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Estados Unidos