Loss of TRIM33 causes resistance to BET bromodomain inhibitors through MYC- and TGF-ß-dependent mechanisms.
Proc Natl Acad Sci U S A
; 113(31): E4558-66, 2016 08 02.
Article
en En
| MEDLINE
| ID: mdl-27432991
ABSTRACT
Bromodomain and extraterminal domain protein inhibitors (BETi) hold great promise as a novel class of cancer therapeutics. Because acquired resistance typically limits durable responses to targeted therapies, it is important to understand mechanisms by which tumor cells adapt to BETi. Here, through pooled shRNA screening of colorectal cancer cells, we identified tripartite motif-containing protein 33 (TRIM33) as a factor promoting sensitivity to BETi. We demonstrate that loss of TRIM33 reprograms cancer cells to a more resistant state through at least two mechanisms. TRIM33 silencing attenuates down-regulation of MYC in response to BETi. Moreover, loss of TRIM33 enhances TGF-ß receptor expression and signaling, and blocking TGF-ß receptor activity potentiates the antiproliferative effect of BETi. These results describe a mechanism for BETi resistance and suggest that combining inhibition of TGF-ß signaling with BET bromodomain inhibition may offer new therapeutic benefits.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Azepinas
/
Factores de Transcripción
/
Triazoles
/
Proteínas
/
Proteínas Proto-Oncogénicas c-myc
/
Factor de Crecimiento Transformador beta
Tipo de estudio:
Etiology_studies
/
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Año:
2016
Tipo del documento:
Article