title: Advanced glycation end-products activate extracellular signal-regulated kinase via the oxidative stress-EGF receptor pathway in renal fibroblasts.
abstract: Advanced glycation end-products (AGEs), epidermal growth factor receptor (EGFR), reactive oxygen species (ROS), and extracellular signal-regulated kinases (ERK) are implicated in diabetic nephropathy (DN). Therefore, we asked if AGEs-induced ERK protein phosphorylation and mitogenesis are dependent on the receptor for AGEs (RAGE)-ROS-EGFR pathway in normal rat kidney interstitial fibroblast (NRK-49F) cells. We found that AGEs (100 microg/ml) activated EGFR and ERK1/2, which was attenuated by RAGE short-hairpin RNA (shRNA). AGEs also increased RAGE protein and intracellular ROS levels while RAGE shRNA and N-acetylcysteine (NAC) attenuated AGEs-induced intracellular ROS. Hydrogen peroxide (5-25 microM) increased RAGE protein level while activating both EGFR and ERK1/2. Low-dose hydrogen peroxide (5 microM) increased whereas high-dose hydrogen peroxide (100 microM) decreased mitogenesis at 3 days. AGEs-activated EGFR and ERK1/2 were attenuated by an anti-oxidant (NAC) and an EGFR inhibitor (Iressa). Moreover, AGEs-induced mitogenesis was attenuated by RAGE shRNA, NAC, Iressa, and an ERK1/2 inhibitor (PD98059). In conclusion, it was found that AGEs-induced mitogenesis is dependent on the RAGE-ROS-EGFR-ERK1/2 pathway whereas AGEs-activated ERK1/2 is dependent on the RAGE-ROS-EGFR pathway in NRK-49F cells.
authors.affiliation: Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: San-Cher
authors.initials: SC
authors.lastname: Chen
authors.forename: Jinn-Yuh
authors.initials: JY
authors.lastname: Guh
authors.forename: Chi-Ching
authors.initials: CC
authors.lastname: Hwang
authors.forename: Shean-Jaw
authors.initials: SJ
authors.lastname: Chiou
authors.forename: Tai-Du
authors.initials: TD
authors.lastname: Lin
authors.forename: Yu-Ming
authors.initials: YM
authors.lastname: Ko
authors.forename: Jau-Shyang
authors.initials: JS
authors.lastname: Huang
authors.forename: Yu-Lin
authors.initials: YL
authors.lastname: Yang
authors.forename: Lea-Yea
authors.initials: LY
authors.lastname: Chuang
mesh_terms: D000818:Animals; D066246:ErbB Receptors / Q000378:metabolism*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism* / Q000473:pathology; D017127:Glycation End Products, Advanced / Q000378:metabolism*; D015151:Immunoblotting; D007668:Kidney / Q000378:metabolism* / Q000473:pathology; D018384:Oxidative Stress / Q000502:physiology*; D010766:Phosphorylation; D034741:RNA, Small Interfering; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology; D014162:Transfection
chemical_list: D017127:Glycation End Products, Advanced; D034741:RNA, Small Interfering; D017382:Reactive Oxygen Species; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic; D066246:ErbB Receptors; D048049:Extracellular Signal-Regulated MAP Kinases