Regulation of multiple tumor microenvironment markers by overexpression of single or paired combinations of ErbB receptors.
The progression of primary tumors to an invasive phenotype requires dynamic changes in multiple cellular and local tumor microenvironment markers. In this study, we report a genomic approach to assess gene transcriptional changes upon overexpression of ErbB receptors, in vitro and in vivo, focusing on markers involved in the regulation of the tumor microenvironment. ErbB receptors (ErbB-1/epidermal growth factor receptor, ErbB-2, ErbB-3, and ErbB-4) were stably overexpressed in a polyclonal cell population as single or paired combinations using murine and human breast cell models. The overall numbers of known genes that are up- or down-regulated was significantly higher in cells and tumors overexpressing paired combinations of receptors compared with cells and tumors overexpressing single ErbB receptors. Genes encoding components of cell-cell structures, extracellular matrix, coagulation factors, and angiogenesis were predominantly affected by the most active ErbB receptor combinations and were predictive of the aggressive in vivo tumorigenicity, a feature that was not always seen in vitro. Among ErbB-regulated tumor microenvironment markers detected by the genomic analysis, thrombospondin 1, an endogenous inhibitor of angiogenesis, was additionally validated in relation to tumor growth phenotype. Thrombospondin 1 mRNA and protein were down-regulated by specific ErbB receptors, in vitro and in both rodent and human ErbB-induced tumors, consistent with the extent of tumor growth and tumor vascularization associated with specific ErbB receptors. In summary, our genomic results highlight the broad diversity of ErbB-regulated cancer-associated genes and revealed several novel targets that may have potential therapeutic applications for targeting tumor progression involving aberrations of ErbB receptors.
Alaoui-Jamali
Moulay A
MA
Lady Davis Institute for Medical Research of the Sir Mortimer B. Davis Jewish General Hospital, Department of Medicine, McGill University, Montreal, Quebec, H3T 1E2 Canada. moulay.alaoui-jamali@mcgill.ca
Song
Daniel J
DJ
Benlimame
Naciba
N
Yen
Lily
L
Deng
Xiaoming
X
Hernandez-Perez
Maite
M
Wang
Taiqi
T
D016475:3T3 Cells; D000818:Animals; D015152:Blotting, Northern; D001943:Breast Neoplasms / Q000235:genetics; D017931:DNA Primers; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D008325:Mammary Neoplasms, Experimental / Q000235:genetics; D051379:Mice; D008819:Mice, Nude; D020411:Oligonucleotide Array Sequence Analysis; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics; D012334:RNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
D017931:DNA Primers; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D018719:Erb-b2 Receptor Tyrosine Kinases