Abstract
Advanced glycation endproducts (AGEs) are suggested to play an important role in diabetic nephropathy. They induce specific cellular responses such as the release of cytokines in different cell lines. The effect of AGEs on signal transduction pathways was investigated in the renal tubulus cell line LLC-PK1. Using a serine-phosphate-specific antibody AGE-induced cellular responses associated with phosphorylation/dephosphorylation events were demonstrated. In particular, the p42MAP kinase and its downstream target, the AP-1 complex, are shown to be activated by AGE-BSA but not by BSA. In contrast, only partial phosphorylation is observed for the p70S6-kinase. Thus, AGEs appear to induce specific signal transduction pathways.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Calcium-Calmodulin-Dependent Protein Kinases / metabolism*
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Cell Division
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Enzyme Activation
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Glycation End Products, Advanced / physiology*
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LLC-PK1 Cells
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Mitogen-Activated Protein Kinase 1
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Phosphorylation
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Protein Serine-Threonine Kinases / metabolism
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Protein-Tyrosine Kinases / metabolism*
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Ribosomal Protein S6 Kinases
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Serum Albumin, Bovine
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Signal Transduction*
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Swine
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Transcription Factor AP-1 / metabolism
Substances
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Glycation End Products, Advanced
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Transcription Factor AP-1
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Serum Albumin, Bovine
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Protein-Tyrosine Kinases
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Protein Serine-Threonine Kinases
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Ribosomal Protein S6 Kinases
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Calcium-Calmodulin-Dependent Protein Kinases
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Mitogen-Activated Protein Kinase 1