Alterations in human glomerular epithelial cells interacting with nonenzymatically glycosylated matrix.
The glomerular epithelial cells and the glomerular basement membrane are important constituents of the permselective barrier in the kidney. These are affected in diabetic nephropathy, one of the long-term complications in diabetic patients. Nonenzymatic glycosylation resulting in the accumulation of advanced glycosylation end products correlates with the development of long-term complications in diabetes. The interaction of cells with extracellular matrix proteins plays a critical role in a variety of biological processes. Recent studies show that cell-matrix interactions mediated by integrins can transduce biochemical signals to the cell interior and regulate cell behavior. In this paper we demonstrate that interactions of human glomerular epithelial cells with a nonenzymatically glycated matrix are altered with defective cell spreading, reduced phosphorylation of focal adhesion kinase and reduced activity of mitogen-activated protein kinase. These data suggest that matrix glycation interferes with normal cell-matrix interactions and intracellular signaling that can potentially result in differential gene expression contributing to the changes seen in diabetic nephropathy.
Krishnamurti
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U
Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota 55455, USA. kris0019@maroon.tc.umn.edu
Rondeau
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Sraer
J D
JD
Michael
A F
AF
Tsilibary
E C
EC
D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000378:metabolism; D002461:Cell Line, Transformed; D002465:Cell Movement; D003928:Diabetic Nephropathies / Q000378:metabolism / Q000473:pathology; D004847:Epithelial Cells / Q000378:metabolism; D005109:Extracellular Matrix / Q000378:metabolism*; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D006031:Glycosylation; D006801:Humans; D007678:Kidney Glomerulus / Q000166:cytology / Q000201:enzymology / Q000378:metabolism*; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D015398:Signal Transduction
D015815:Cell Adhesion Molecules; D011505:Protein-Tyrosine Kinases; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; C496050:PTK2 protein, human