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Comparative Membranome expression analysis in primary tumors and derived cell lines.
Paolo Uva1, Armin Lahm, Andrea Sbardellati
1CRS4 Bioinformatics Laboratory, Parco Scientifico e Tecnologico POLARIS, Pula, Cagliari, Italy.
Plos One
|July 30, 2010
Summary
Cancer cell lines partially mimic primary tumors' surface gene expression, but lose key up-regulations. This study reveals differences in membrane protein (Membranome) profiles, guiding more accurate use of cell lines in cancer research.
Area of Science:
- Oncology
- Genomics
- Molecular Biology
Background:
- Cell lines are widely used in cancer research but their surface gene expression similarity to primary tumors is not well understood.
- Understanding cell surface properties is crucial for modeling cancer accurately.
Purpose of the Study:
- To transcriptionally compare the membrane protein genes (Membranome) of primary tumors and in vitro cultured tumor cell lines.
- To assess how well cell lines represent primary tumors regarding Membranome expression and regulation.
- To identify differences in Membranome expression and pathways between tumors and cell lines.
Main Methods:
- Analysis of Membranome gene expression in 409 human samples from ten studies, including normal tissues, primary tumors, and tumor-derived cell lines across eight tissue types.
- Comparative transcriptional analysis of Membranome expression between primary tumors and cell lines.
- Pathway-level analysis to identify differentially regulated biological themes.
- Quantification of Membranome up- and down-regulations in cell lines compared to primary tumors and normal tissues.
Main Results:
- The Membranome was more effective than the whole transcriptome for classifying tumor samples, a feature preserved in cell lines.
- Primary tumors generally showed the highest Membranome similarity to cell lines of the same tissue origin.
- Most Membranome up-regulations observed in primary tumors were lost in cell lines, while down-regulations were largely maintained.
- Significant differences in Membranome expression and pathway regulation were identified between primary tumors and cell lines.
Conclusions:
- Membranome genes play a critical role in defining the tumor phenotype.
- Cell lines have limitations as models for studying cell surface-mediated cancer processes due to significant Membranome expression differences.
- This study provides insights for a more rational and informed use of cell lines in cancer research.
