Related Experiment Videos
Inhibition of tumorigenicity in lung adenocarcinoma cells by c-erbB-2 antisense expression
P Casalini1, S Ménard, S M Malandrin
1Division of Experimental Oncology E, Istituto Nazionale Tumori, Milan, Italy.
Abstract:
The lung carcinoma cell line Calu3, which overexpresses the c-erbB-2 oncogene, was stably transfected with antisense (AS) cDNA constructs encompassing different regions of the c-erbB-2 gene. Transfected cells were analyzed for their tumorigenic properties in vitro and in nude mice. Two independent clones, AS F1 (low erbB-2 expressor) and AS B12 (high erbB-2 expressor), as well as the polyclonal Calu3/AS 5', were selected for these analyses. In Calu3/AS 5' transfected cells and in the AS F1 clone, c-erbB-2 RNA and protein levels were lower than those detected in the parental cell line and the AS B12 clone. Anchorage-independent growth and tumor take were also significantly reduced. Furthermore, cells derived from primary tumors of Calu3/AS 5', AS F1 and AS B12 lost the AS c-erbB-2 DNA insert but retained the gene for G418 resistance. Our results suggest that a correlation between c-erbB-2 overexpression and tumorigenicity may exist in the Calu3 lung carcinoma cell line.
Insights
Antisense c-erbB-2 gene transfection reduced lung carcinoma cell tumorigenicity. Lower c-erbB-2 expression correlated with decreased anchorage-independent growth and tumor formation in nude mice.
Area of Science:
- Oncology
- Molecular Biology
- Gene Therapy
Background:
- The c-erbB-2 oncogene is often overexpressed in lung carcinoma.
- Calu3 cells, a lung carcinoma cell line, overexpress c-erbB-2.
- Understanding the role of c-erbB-2 in tumorigenesis is crucial for targeted therapies.
Purpose of the Study:
- To investigate the effect of antisense (AS) c-erbB-2 gene constructs on the tumorigenic properties of Calu3 lung carcinoma cells.
- To determine the correlation between c-erbB-2 expression levels and tumor development.
- To analyze the stability of AS c-erbB-2 DNA inserts in tumor cells.
Main Methods:
- Stable transfection of Calu3 cells with different AS c-erbB-2 cDNA constructs.
- Analysis of c-erbB-2 RNA and protein levels in transfected clones.
- Assessment of in vitro tumorigenic properties, including anchorage-independent growth.
- Evaluation of in vivo tumorigenicity in nude mice (tumor take).
- Genetic analysis of primary tumors to assess AS c-erbB-2 DNA insert stability.
Main Results:
- Two clones, AS F1 (low expressor) and AS B12 (high expressor), and a polyclonal line (Calu3/AS 5') were established.
- Calu3/AS 5' and AS F1 showed reduced c-erbB-2 RNA and protein levels compared to parental cells.
- Anchorage-independent growth and tumor take were significantly reduced in cells with lower c-erbB-2 expression.
- Primary tumor cells lost the AS c-erbB-2 DNA insert but retained the G418 resistance gene.
Conclusions:
- A correlation exists between c-erbB-2 overexpression and enhanced tumorigenicity in Calu3 lung carcinoma cells.
- Downregulation of c-erbB-2 via antisense technology can significantly inhibit tumor growth and development.
- These findings support the potential of targeting c-erbB-2 for lung cancer therapy.