Bridge-1 is expressed in human breast carcinomas: silencing of Bridge-1 decreases Smad2, Smad3 and Smad4 expression in MCF-7 cells, a human breast cancer cell line.
Arch Gynecol Obstet
; 284(6): 1543-9, 2011 Dec.
Article
em En
| MEDLINE
| ID: mdl-21448710
ABSTRACT
PURPOSE:
The aim of the study was to investigate the expression of Bridge-1 in human breast carcinomas, and to determine the in vitro regulation of Bridge-1 by activin A and the influence of Bridge-1 on activin A signaling in the human breast cancer cell line MCF-7.METHOD:
Bridge-1 expression in human breast carcinomas was shown after staining paraffin slides with a specific antibody against Bridge-1. To gain insight into Bridge-1 function, immortalized, human breast cancer cells (MCF-7 cell line) were stimulated with activin A and the expression of Bridge-1 was analyzed by real-time PCR and Western blot. Next, Bridge-1 was downregulated via siRNA treatment in MCF-7 cells and the expression of Bridge-1, Smad2, 3 and 4 was investigated by real-time PCR and Western blot.RESULTS:
Human breast carcinoma cells showed nuclear and cytoplasmic localization of Bridge-1. Activin A stimulation of the immortalized human breast adenocarcinoma cell line MCF-7 showed an increase in Bridge-1 expression by real-time PCR and Western blot. Downregulation of Bridge-1 by Bridge-1-siRNA resulted in a decreased expression of Smad2, 3 and 4 of up to 50% compared to the treatment with non-targeting siRNA.CONCLUSIONS:
This study is the first to demonstrate the expression of Bridge-1 in human breast carcinomas. Bridge-1 expression is increased by activin A stimulation and itself seems to influence activin A signaling by affecting the expression of Smad2, 3 and 4.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
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Regulação Neoplásica da Expressão Gênica
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Inativação Gênica
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Complexo de Endopeptidases do Proteassoma
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Proteína Smad2
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Proteína Smad3
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Proteína Smad4
Limite:
Female
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Humans
Idioma:
En
Revista:
Arch Gynecol Obstet
Ano de publicação:
2011
Tipo de documento:
Article