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[The effect of transfecting Stat3beta cDNA on human breast cancer]
Lin Cheng1, Shan Wang, Ying-Jiang Ye
1Department of Breast Surgery and Laboratory of Surgical Oncology, Peking University People's Hospital, Beijing 100044, China.
Objective:
To study the effect of transfecting Stat3beta cDNA on human breast cancer.
Methods:
Human breast cancer cells of the line SK-BR-3 were cultured and divided into 3 groups: Stat3beta transfection group (to be transfected with plasmid pIRES-Stat3beta containing Stat3beta by transient transfection technique), lipofectin reagent transfection group pIRES-EGFP transfection group, and control group. The positively transfected cells were isolated by fluorescence-activated cell sorter. Flow cytometry was used to analyze the cell cycles and cell apotosis. Western blotting was used to detect the expression of STAT3 protein. MTT method was used to examine the proliferation of the cells.
Results:
Forty-eight hours after exposure to the plasmid pIRES-Stat3beta the transfection rate of the SK-BR-3 cells was 13.79%. SK-BR-3 cells expressed STA3 protein during proliferation. In comparison with the SK-BR-3 cells of other 3 group, the proliferation of the cells transfected with pIRES-Stat3beta was significantly decreased. Forty-eight hours after transfection, 81.09% of the cells transfected with the plasmid pIRES-Stat3beta accumulated at the G(0)/G(1) stage, a rate significantly higher than those of the other groups, and displayed a significantly higher rate of apoptosis.
Conclusion:
Transfection of plasmid pIRES-Stat3beta containing Stat3beta blocks the Stat3 pathway, thus inhibiting the proliferation and augment the apoptosis of human breast cancer cells and providing a novel gene therapy target.
Insights
Introducing Stat3beta into human breast cancer cells significantly inhibits proliferation and increases apoptosis. This finding offers a potential new target for gene therapy in breast cancer treatment.
Area of Science:
- Molecular Biology
- Oncology
- Gene Therapy
Context:
- Signal transducer and activator of transcription 3 (STAT3) is implicated in various cancers, including breast cancer.
- STAT3 exists in different isoforms, such as STAT3beta, which may have distinct roles in cellular processes.
Purpose:
- To investigate the functional impact of transfecting Stat3beta cDNA on human breast cancer cells.
- To evaluate the effects of Stat3beta on cell proliferation, cell cycle, and apoptosis in SK-BR-3 breast cancer cells.
Summary:
- Human breast cancer cells (SK-BR-3) were transfected with Stat3beta cDNA using plasmid pIRES-Stat3beta.
- Compared to control groups, Stat3beta transfection led to significantly decreased cell proliferation and increased apoptosis.
- Flow cytometry revealed cell cycle arrest at the G(0)/G(1) stage, and Western blotting confirmed STAT3 protein expression.
Impact:
- Stat3beta transfection effectively inhibits the STAT3 pathway in breast cancer cells.
- This study identifies Stat3beta as a potential therapeutic target for inhibiting human breast cancer progression.
- The findings contribute to the development of novel gene therapy strategies for breast cancer.
