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Am J Physiol Renal Physiol 284: F671-F679, 2003. First published December 3, 2002; doi:10.1152/ajprenal.00266.2002
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Vol. 284, Issue 4, F671-F679, April 2003

Glucose-induced changes in integrins and matrix-related functions in cultured human glomerular epithelial cells

Paraskevi V. Kitsiou1, Athina K. Tzinia1, William G. Stetler-Stevenson2, Alfred F. Michael3, Wei-Wei Fan3, Bing Zhou3, and Effie C. Tsilibary1

1 Institute of Biology, National Center for Scientific Research "Demokritos," 15310 Agia Paraskevi, Athens, Greece; 2 Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892; and 3 Department of Pediatrics, University of Minnesota Medical School, Minneapolis, Minnesota 55455

In cultured human glomerular epithelial cells (HGEC), 25 mM glucose resulted in decreased expression of alpha 3-, alpha 2-, and beta 1-integrins and increased expression of alpha 5- and alpha vbeta 3-integrins. This change was accompanied by decreased binding of HGEC to type IV collagen. In the presence of normal (5 mM) glucose concentration, cell binding to type IV collagen was primarily mediated by alpha 2beta 1- and alpha 5beta 1-integrins, as indicated by experiments in which cell adhesion to type IV collagen was competed by specific anti-integrin monoclonal antibodies. In the presence of high (25 mM) glucose, the upregulated alpha 5- and alpha vbeta 3-integrins were mainly involved in cell binding to type IV collagen. Furthermore, high glucose decreased expression of matrix metalloproteinase-2 (MMP-2), a collagenase regulated in part by alpha 3beta 1-integrin, as suggested by the use of ligand-mimicking antibodies against these integrins, which resulted in release of increased amounts of MMP-2 in the culture medium. Finally, tissue inhibitor of metalloproteinase-2, the specific inhibitor of MMP-2, was upregulated in high glucose and could contribute to matrix accumulation. These changes could help explain basement membrane thickening in diabetes.

matrixins; tissue inhibitors of metalloproteinases; signaling; diabetes


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