title: Advanced glycation end product (AGE) receptor 1 suppresses cell oxidant stress and activation signaling via EGF receptor.
abstract: Advanced glycation end product receptors (AGERs) play distinct functional roles in both the toxicity and disposal of advanced glycation end products (AGEs), substances that are linked to diabetes and aging. Overexpression of AGER1 in murine mesangial cells (MCs) (MC-R1) inhibited AGE-induced MAPK1,2 phosphorylation and NF-kappaB activity and also increased AGE degradation. The mechanism of the inhibitory effects of AGER1, upstream of MAPK, was explored in MCs and HEK293 AGER1-expressing cells. AGE-induced Ras activation was found to be linked to Shc/Grb2 complex formation and Shc phosphorylation in MCs, responses that were markedly reduced in MC-R1 cells. AGE responses also included EGF receptor (EGFR) phosphorylation in MCs or HEK293 cells, but this link was blocked in both MC-R1 and HEK293-R1 cells. Coexpression of AGER1 and EGFR in HEK293 cells decreased AGE-mediated EGFR and p44/p42 phosphorylation but not EGF-induced p44/p42 activation. AGE, S100/calgranulin, or H(2)O(2) promoted MAPK phosphorylation in EGFR(+) cells in a manner that was inhibitable by an EGFR inhibitor, AG1478. Also, in AGER1 cells, AGE-induced H(2)O(2) formation and AGE- or S100-induced p44/p42 phosphorylation were suppressed, and these effects were restored by R1 siRNA. These data confirm that R1 negatively regulates AGE-mediated oxidant stress-dependent signaling via the EGFR and Shc/Grb2/Ras pathway. AGER1 could serve as a model for developing therapeutic targets against vascular and kidney disorders related to diabetes and aging.
authors.affiliation: Division of Experimental Diabetes and Aging, Brookdale Department of Geriatrics, and Division of Nephrology, Department of Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA.
authors.forename: Weijing
authors.initials: W
authors.lastname: Cai
authors.forename: John C
authors.initials: JC
authors.lastname: He
authors.forename: Li
authors.initials: L
authors.lastname: Zhu
authors.forename: Changyong
authors.initials: C
authors.lastname: Lu
authors.forename: Helen
authors.initials: H
authors.lastname: Vlassara
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism; D000818:Animals; D002478:Cells, Cultured; D015536:Down-Regulation; D004815:Epidermal Growth Factor / Q000494:pharmacology; D066246:ErbB Receptors / Q000819:agonists / Q000037:antagonists & inhibitors* / Q000378:metabolism; D051380:GRB2 Adaptor Protein / Q000378:metabolism; D017127:Glycation End Products, Advanced / Q000494:pharmacology; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D050527:Mesangial Cells / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D016877:Oxidants / Q000494:pharmacology; D018384:Oxidative Stress / Q000235:genetics; D017382:Reactive Oxygen Species / Q000378:metabolism; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic / Q000235:genetics / Q000378:metabolism*; D055765:Shc Signaling Adaptor Proteins; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D015533:Transcriptional Activation; D018631:ras Proteins / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D051380:GRB2 Adaptor Protein; D017127:Glycation End Products, Advanced; D016877:Oxidants; D017382:Reactive Oxygen Species; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic; C528024:SHC1 protein, human; D055765:Shc Signaling Adaptor Proteins; C528034:Shc1 protein, mouse; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D004815:Epidermal Growth Factor; D006861:Hydrogen Peroxide; D066246:ErbB Receptors; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D018631:ras Proteins