Highly Expressed Genes in Rapidly Proliferating Tumor Cells as New Targets for Colorectal Cancer Treatment

• Published in: Clinical cancer research Vol. 21; no. 16; pp. 3695 - 3704
• Main Authors: Bazzocco, Sarah, Dopeso, Higinio, Carton-Garcia, Fernando, Macaya, Irati, Andretta, Elena, Chionh, Fiona, Rodrigues, Paulo, Garrido, Miriam, Alazzouzi, Hafid, Nieto, Rocio, Sanchez, Alex, Schwartz, Jr, Simo, Bilic, Josipa, Mariadason, John M, Arango, Diego
• Format: Journal Article
• Language: English
• Published: United States 15.08.2015
• Subjects: Animals; Cell Cycle - genetics; Cell Proliferation - genetics; Colorectal Neoplasms - drug therapy; Colorectal Neoplasms - genetics; Colorectal Neoplasms - pathology; Female; Flavoproteins - antagonists & inhibitors; Flavoproteins - biosynthesis; Flavoproteins - genetics; Gene Expression Regulation, Neoplastic; Glyceraldehyde-3-Phosphate Dehydrogenases - biosynthesis; Glyceraldehyde-3-Phosphate Dehydrogenases - genetics; HCT116 Cells; Humans; Male; Mice; Mitochondrial Proteins - antagonists & inhibitors; Mitochondrial Proteins - biosynthesis; Mitochondrial Proteins - genetics; Molecular Targeted Therapy; Neoplasm Proteins - biosynthesis; Neoplasm Proteins - genetics; Nitrobenzoates - administration & dosage; Protein Transport - genetics; Protoporphyrinogen Oxidase - antagonists & inhibitors; Protoporphyrinogen Oxidase - biosynthesis; Protoporphyrinogen Oxidase - genetics; RNA Splicing - genetics; RNA, Small Interfering; Signal Transduction; Xenograft Model Antitumor Assays
• ISSN: 1078-0432; 1557-3265
• DOI: 10.1158/1078-0432.ccr-14-2457

The clinical management of colorectal cancer patients has significantly improved because of the identification of novel therapeutic targets such as EGFR and VEGF. Because rapid tumor proliferation is associated with poor patient prognosis, here we characterized the transcriptional signature of rapidly proliferating colorectal cancer cells in an attempt to identify novel candidate therapeutic targets. The doubling time of 52 colorectal cancer cell lines was determined and genome-wide expression profiling of a subset of these lines was assessed by microarray analysis. We then investigated the potential of genes highly expressed in cancer cells with faster growth as new therapeutic targets. Faster proliferation rates were associated with microsatellite instability and poorly differentiated histology. The expression of 1,290 genes was significantly correlated with the growth rates of colorectal cancer cells. These included genes involved in cell cycle, RNA processing/splicing, and protein transport. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and protoporphyrinogen oxidase (PPOX) were shown to have higher expression in faster growing cell lines and primary tumors. Pharmacologic or siRNA-based inhibition of GAPDH or PPOX reduced the growth of colon cancer cells in vitro. Moreover, using a mouse xenograft model, we show that treatment with the specific PPOX inhibitor acifluorfen significantly reduced the growth of three of the seven (42.8%) colon cancer lines investigated. We have characterized at the transcriptomic level the differences between colorectal cancer cells that vary in their growth rates, and identified novel candidate chemotherapeutic targets for the treatment of colorectal cancer.