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- W2027767115 abstract "The model of streptozotocin (STZ)-induced diabetes in Wistar rats was used to study the expression of osteopontin during development of diabetic nephropathy. Diabetes was confirmed by serum glucose levels exceeding 16 mmol/l during the experimental period of 12 weeks. During this period of time, diabetic nephropathy developed, as characterized by a reduced glomerular filtration rate (2.7 +/- 0.3 ml/min in controls vs. 1.7 +/- 0.1 ml/min in diabetic rats) and proteinuria (8.3 +/- 1.7 mg/24 h in controls vs. 22.0 +/- 4 mg/24 h in diabetic rats). Northern blot analysis revealed a time-dependent upregulation of renal cortical osteopontin expression reaching 138 +/- 6% of control levels after 2 weeks and 290 +/- 30% (mean +/- SE, n = 6-9) after 12 weeks. By immunostaining, the increased osteopontin expression could be located to the tubular epithelium of the renal cortex. Chronic treatment of animals with ramipril (3 mg/kg) during the 12-week experimental period led to a further increase in osteopontin mRNA expression in diabetic animals, amounting to 570 +/- 73% (mean +/- SE, n = 6) of controls. Increased levels of osteopontin were not associated with accumulation of monocyte/macrophages that were identified by the cell type specific monoclonal antibody ED-1. The increased osteopontin expression in ramipril-pretreated rats was abolished by application of the bradykinin B2-receptor antagonist, icatibant (0.5 mg/kg). In addition, increased osteopontin expression in diabetic rats, which did not receive any treatment after STZ injection, could as well be reduced by icatibant given for the final 2 weeks of the experimental period. These data suggest that a strong bradykinin B2-receptor-mediated upregulation of osteopontin occurs during the pathogenesis of experimental diabetic nephropathy in rats." @default.
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- W2027767115 title "Upregulation of osteopontin expression in renal cortex of streptozotocin-induced diabetic rats is mediated by bradykinin." @default.
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- W2027767115 doi "https://doi.org/10.2337/diabetes.47.9.1512" @default.
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