We investigated pro-tumour factors secreted by mononuclear cells that activate two of the most important oncogenic pathways: EGFR and STAT3. Upon exposure to tumour cell-supernatants, human peripheral blood monocytes and macrophages secrete one specific EGF family ligand each and a common STAT3 activator. Primed monocytes secrete epiregulin (EREG) and oncostatin-M (OSM), while macrophages secrete heparin-binding EGF-like growth factor (HB-EGF) and OSM. HB-EGF and OSM cooperatively induce chemotaxis of epithelial cells. In mammary carcinoma patients, elevated HB-EGF and OSM plasma protein levels correlate. Elevated HB-EGF plasma levels accompany tumour growth and dissemination in patients with invasive disease. We identify monocyte/macrophage-secreted EREG, HB-EGF and OSM as potential targets for therapeutic intervention in the macrophage-assisted dissemination of tumours.
«
We investigated pro-tumour factors secreted by mononuclear cells that activate two of the most important oncogenic pathways: EGFR and STAT3. Upon exposure to tumour cell-supernatants, human peripheral blood monocytes and macrophages secrete one specific EGF family ligand each and a common STAT3 activator. Primed monocytes secrete epiregulin (EREG) and oncostatin-M (OSM), while macrophages secrete heparin-binding EGF-like growth factor (HB-EGF) and OSM. HB-EGF and OSM cooperatively induce chemota...
»