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Extracellular signal-regulated kinase mediates stimulation of TGF-beta1 and matrix by high glucose in mesangial cells.

Authors
 MOTOHIDE ISONO  ;  M. CARMEN IGLESIAS-DE LA CRUZ  ;  SHELDON CHEN  ;  SOON WON HONG  ;  FUAD N. ZIYADEH 
Citation
 Journal of the American Society of Nephrology, Vol.11(12) : 2222-2230, 2000 
Journal Title
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
ISSN
 1046-6673 
Issue Date
2000
MeSH
Animals ; Cell Cycle Proteins* ; Cell Line ; Dose-Response Relationship, Drug ; Dual Specificity Phosphatase 1 ; Enzyme Activation ; Enzyme Inhibitors/pharmacology ; Extracellular Matrix/drug effects ; Extracellular Matrix/metabolism ; Flavonoids/pharmacology ; Gene Expression/drug effects ; Glomerular Mesangium/cytology ; Glomerular Mesangium/drug effects* ; Glomerular Mesangium/metabolism* ; Glucose/administration & dosage ; Glucose/pharmacology* ; Immediate-Early Proteins/metabolism ; Mice ; Mitogen-Activated Protein Kinases/metabolism ; Mitogen-Activated Protein Kinases/physiology* ; Phosphoprotein Phosphatases* ; Promoter Regions, Genetic/physiology ; Protein Phosphatase 1 ; Protein Tyrosine Phosphatases/metabolism ; Transforming Growth Factor beta/biosynthesis ; Transforming Growth Factor beta/genetics ; Transforming Growth Factor beta/metabolism* ; Transforming Growth Factor beta1
Abstract
High ambient glucose exerts its injurious effects on renal cells through nonenzymatic and enzymatic pathways, including altered signal transduction and upregulation of the transforming growth factor-beta (TGF-beta) system. Extracellular signal-regulated kinase (ERK), a member of the mitogen-activated protein kinase (MAPK) cascade, is activated in mesangial cells cultured in high glucose and in glomeruli of diabetic rats. However, the biologic consequences of ERK activation in the kidney have not been investigated. To clarify the role of ERK activation, mouse mesangial cells were exposed to normal (5.5 mM) or high (25 mM) glucose with or without addition of PD98059, a specific inhibitor of MAPK/ERK kinase (MEK), an upstream kinase activator of ERK. Cells that were exposed to high glucose exhibited significant increases in ERK activity, TGF-beta1 expression (total protein, mRNA levels, and promoter activity), [(3)H]-proline uptake, and alpha1(I) collagen and fibronectin mRNA levels. Treatment with PD98059 (up to 25 microM) significantly inhibited these parameters. In contrast, 25 microM PD98059 had no significant effect on any of the parameters measured in cells that were exposed to normal glucose. Overexpression of MAPK phosphatase CL 100 prevented TGF-beta1 promoter activation by high glucose, confirming the involvement of the MEK-ERK pathway in response to high glucose. The conclusion is that activation of ERK in mesangial cells is responsible for high-glucose-induced stimulation of TGF-beta1 and contributes to the increased extracellular matrix expression.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Pathology (병리학교실) > 1. Journal Papers
Yonsei Authors
Hong, Soon Won(홍순원) ORCID logo https://orcid.org/0000-0002-0324-2414
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/171745
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