Close link between reduction of c-myc expression by interferon and, G0/G1 arrest.
Nature
; 313(6003): 597-600, 1985.
Article
en En
| MEDLINE
| ID: mdl-3881681
It has recently been reported that c-myc is an inducible gene, regulated directly by growth signals which promote proliferation and expressed in a cell-cycle dependent manner. Because various leukaemic cell lines express high levels of c-myc messenger RNA, it was of interest to discover whether the gene could be down-regulated in these cells by a growth inhibitor such as interferon (IFN). We show here that in Daudi Burkitt's lymphoma cells, IFN-alpha produces a five- to sevenfold reduction in c-myc mRNA through a decreased rate of c-myc gene transcription. By isolating a growth-resistant Daudi cell variant that had escaped from this down-regulation, we provide the first clear link between reduction of c-myc mRNA and the IFN-mediated G0/G1 arrest characteristic of Daudi cells. Furthermore, by screening other cell lines, we demonstrate the heterogeneity of human leukaemic cells with respect to these criteria. Thus, IFN-alpha fails to reduce the c-myc mRNA and to change the cell-cycle distribution in HL-60 and U937 cells, although normal induction of other IFN-regulated activities takes place. The latter group of cells shows a decline in c-myc gene expression when they become arrested in the G0/G1 phase as part of their terminal differentiation.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oncogenes
/
Interferón Tipo I
/
Regulación de la Expresión Génica
/
Interfase
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Nature
Año:
1985
Tipo del documento:
Article
Pais de publicación:
Reino Unido