microRNA-200c downregulates XIAP expression to suppress proliferation and promote apoptosis of triple-negative breast cancer cells.
Mol Med Rep
; 10(1): 315-21, 2014 Jul.
Article
em En
| MEDLINE
| ID: mdl-24821285
ABSTRACT
Despite advances in the understanding of breast cancer, patients most commonly have a poor prognosis, particularly those with triple negative breast cancer (TNBC). microRNAs (miRNAs) are endogenous noncoding small RNAs, and their aberrant expression is linked to numerous malignancies. In the present study, the expression levels of miR200c in patients with TNBC were analyzed and it was identified that miR200c was downregulated in TNBC samples, compared with that in normal adjacent tissues. miR200c was overexpressed in the TNBC cell line MDAMB231 and its functions were studied in vitro and in vivo. An in vitro study revealed that the overexpression of miR200c inhibited MDAMB231 cell proliferation and resulted in the induction of apoptosis. The in vivo data indicated that the overexpression of miR200c significantly inhibited tumor growth and increased the rate of apoptosis. Target prediction revealed that the Xlinked inhibitor of apoptosis (XIAP) had putative complementary sequences to miR200c, which was confirmed by a dual luciferase reporter assay. Western blot analysis further demonstrated that the expression of XIAP was markedly reduced and that caspase3 was highly activated by the overexpression of miR200c. These findings suggested that miR200c may function as a tumor suppressor gene in TNBC, at least partly via directly targeting XIAP, and may therefore act as a potential therapeutic target in the development of novel treatment strategies for TNBC.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Contexto em Saúde:
6_ODS3_enfermedades_notrasmisibles
Problema de saúde:
6_breast_cancer
Assunto principal:
Apoptose
/
MicroRNAs
/
Proteínas Inibidoras de Apoptose Ligadas ao Cromossomo X
/
Neoplasias de Mama Triplo Negativas
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Female
/
Humans
Idioma:
En
Revista:
Mol Med Rep
Ano de publicação:
2014
Tipo de documento:
Article