BRCA1 regulates progesterone receptors A and B protein expressions in breast cancer cells in vitro.
- Author:
Yin-xia GUO
1
;
Wei-sen ZENG
;
Ya-wei LIU
;
Yu-sheng LI
;
Jun LIN
;
Jing-bo XIONG
;
Shen-qiu LUO
Author Information
- Publication Type:Journal Article
- MeSH: BRCA1 Protein; biosynthesis; genetics; Blotting, Western; Breast Neoplasms; genetics; metabolism; pathology; Cell Line, Tumor; Female; Gene Expression Regulation, Neoplastic; Humans; RNA, Messenger; biosynthesis; genetics; RNA, Small Interfering; genetics; Receptors, Progesterone; biosynthesis; genetics; Reverse Transcriptase Polymerase Chain Reaction; Transfection
- From: Journal of Southern Medical University 2008;28(7):1157-1160
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo study the regulatory role of BRCA1 in the expression of progesterone receptors A and B (PRA and PRB) in breast cancer cells.
METHODSBreast cancer MCF-7 cells were transfected with pFlag-CMV2-BRCA1 wt plasmid containing a full-length BRCA1 cDNA or with BRCA1-specific siRNA via lipofectamine 2000 to induce overexpression or suppressed expression of BRCA1, respectively. Twenty-four hours after the transfection, the cells were incubated in fresh culture medium containing 100 nmol/L progesterone for 24 h. The total RNA extract or whole cell lysate was prepared for detecting BRCA1, PRA and PRB expressions using RT-PCR and Western blotting.
RESULTSThe protein expressions of PRA and PRB were significantly decreased whereas their mRNA expressions remained unchanged in MCF-7 cells overexpressing BRCA1. In MCF-7 cells with BRCA1 knock-down, in contrast, the PRA and PRB protein expressions were markedly increased.
CONCLUSIONIn breast cancer cells, exogenous and endogenous BRCA1 can both down-regulate the expressions of PRA and PRB at the protein level.