CG223, a novel BET inhibitor, exerts TGF-ß1-mediated antifibrotic effects in a murine model of bleomycin-induced pulmonary fibrosis.
Pulm Pharmacol Ther
; 70: 102057, 2021 10.
Article
en En
| MEDLINE
| ID: mdl-34425215
Pulmonary fibrosis is a progressive disease with poor prognosis and limited therapeutic options. In this study, we evaluated the potential therapeutic effects of CG223, a novel inhibitor of bromodomain and extra-terminal motif (BET) proteins, on pulmonary fibrosis by focusing on the transforming growth factor-ß1 (TGF-ß1) pathway. In a murine model of bleomycin-induced pulmonary fibrosis, CG223 attenuated fibrosis while reducing the infiltration of inflammatory cells into the lungs. Fibroblasts expressing BRD4, a member of the BET protein family, were enriched in the tissue regions corresponding to bleomycin-induced fibrotic lesions. Additionally, pulmonary fibroblasts isolated from bleomycin-instilled mice showed a significantly increased association of BRD4 with the promoters of two pro-fibrotic genes linked to the entry into the TGF-ß1 autocrine/paracrine loop, thrombospondin 1 (Thbs1) and integrin ß3 (Itgb3), as well as with the promoter of a myofibroblast marker gene, actin alpha 2 (Acta2). Subsequent in vitro studies with murine primary lung fibroblasts showed that the mRNA induction of Thbs1, Itgb3, and Acta2 by TGF-ß1 can be inhibited by CG223 in a dose-dependent manner. Taken together, CG223-induced BRD4 inhibition suppressed lung fibrogenesis by affecting multiple genes, including those involved in the triggering of the TGF-ß1 autocrine/paracrine loop.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fibrosis Pulmonar
/
Bleomicina
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Pulm Pharmacol Ther
Asunto de la revista:
FARMACOLOGIA
Año:
2021
Tipo del documento:
Article
Pais de publicación:
Reino Unido