title: Transactivation of epidermal growth factor receptor by insulin-like growth factor 1 requires basal hydrogen peroxide.
abstract: Insulin-like growth factor (IGF-1) plays an important role in prostate cancer development. Recent studies suggest that IGF-1 has mitogenic action through epidermal growth factor receptor (EGFR). However, the mechanism remains largely unknown. Here, we demonstrated in prostate cancer DU145 cells that IGF-1 induced EGFR transactivation, leading to ERK activation. Matrix metalloproteinase-mediated shedding of heparin-binding EGF is involved in this process. Antioxidants and catalase inhibited IGF-1-stimulated EGFR phosphorylation, indicating that H(2)O(2) is required for EGFR activation. However, exogenous H(2)O(2) did not activate EGFR or IGF-1R in DU145 cells. IGF-1 did not induced production of H(2)O(2) in DU145 cells. Our results suggest that transactivation of EGFR by IGF-1 requires basal intracellular H(2)O(2) in DU145 cells.
authors.affiliation: The Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Zhou
authors.forename: Dan
authors.initials: D
authors.lastname: Meng
authors.forename: Bing
authors.initials: B
authors.lastname: Yan
authors.forename: Bing-Hua
authors.initials: BH
authors.lastname: Jiang
authors.forename: Jing
authors.initials: J
authors.lastname: Fang
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004789:Enzyme Activation / Q000187:drug effects / Q000235:genetics; D066246:ErbB Receptors / Q000096:biosynthesis* / Q000235:genetics; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism* / Q000494:pharmacology; D008297:Male; D010766:Phosphorylation / Q000187:drug effects; D011471:Prostatic Neoplasms / Q000235:genetics / Q000378:metabolism; D011499:Protein Processing, Post-Translational / Q000187:drug effects / Q000235:genetics; D015533:Transcriptional Activation / Q000187:drug effects
chemical_list: D007334:Insulin-Like Growth Factor I; D006861:Hydrogen Peroxide; D066246:ErbB Receptors; D048049:Extracellular Signal-Regulated MAP Kinases