Cell type specific gene expression analysis of prostate needle biopsies resolves tumor tissue heterogeneity.

Abstract

A lack of cell surface markers for the specific identification, isolation and subsequent analysis of living prostate tumor cells hampers progress in the field. Specific characterization of tumor cells and their microenvironment in a multi-parameter molecular assay could significantly improve prognostic accuracy for the heterogeneous prostate tumor tissue. Novel functionalized gold-nano particles allow fluorescence-based detection of absolute mRNA expression levels in living cells by fluorescent activated flow cytometry (FACS). We use of this technique to separate prostate tumor and benign cells in human prostate needle biopsies based on the expression levels of the tumor marker alpha-methylacyl-CoA racemase (AMACR). We combined RNA and protein detection of living cells by FACS to gate for epithelial cell adhesion molecule (EPCAM) positive tumor and benign cells, EPCAM/CD45 double negative mesenchymal cells and CD45 positive infiltrating lymphocytes. EPCAM positive epithelial cells were further sub-gated into AMACR high and low expressing cells. Two hundred cells from each population and several biopsies from the same patient were analyzed using a multiplexed gene expression profile to generate a cell type resolved profile of the specimen. This technique provides the basis for the clinical evaluation of cell type resolved gene expression profiles as pre-therapeutic prognostic markers for prostate cancer.

• Authors: Malte Krönig, Max Walter, Vanessa Drendel, Martin Werner, Cordula A Jilg, Andreas S Richter, Rolf Backofen, David McGarry, Marie Follo, Wolfgang Schultze-Seemann, Roland Schüle
• Journal: Oncotarget (Oncotarget) Vol. 6 Issue 2 Pg. 1302-14 (Jan 20 2015) ISSN: 1949-2553 [Electronic] United States
• PMID: 25514598 (Publication Type: Journal Article)

Chemical References

• Antigens, Neoplasm
• Biomarkers, Tumor
• Cell Adhesion Molecules
• Epithelial Cell Adhesion Molecule
• Leukocyte Common Antigens
• Racemases and Epimerases
• alpha-methylacyl-CoA racemase

Topics

• Antigens, Neoplasm (genetics, metabolism)
• Biomarkers, Tumor (genetics, metabolism)
• Biopsy, Needle
• Cell Adhesion Molecules (genetics, metabolism)
• Epithelial Cell Adhesion Molecule
• Flow Cytometry
• Gene Expression Profiling (methods)
• Gene Expression Regulation, Neoplastic
• Genetic Heterogeneity
• Humans
• Leukocyte Common Antigens (genetics, metabolism)
• Male
• Prognosis
• Prostate (metabolism, pathology)
• Prostatic Neoplasms (genetics, metabolism, pathology)
• Racemases and Epimerases (genetics, metabolism)
• Reproducibility of Results
• Reverse Transcriptase Polymerase Chain Reaction
• Tumor Cells, Cultured