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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Targeting of sodium-glucose cotransporters with phlorizin inhibits polycystic kidney disease progression in Han:SPRD rats.
Kidney International 2013 November
Renal tubular epithelial cell proliferation and transepithelial cyst fluid secretion are key features in the progression of polycystic kidney disease (PKD). As the role of the apical renal sodium-glucose cotransporters in these processes is not known, we tested whether phlorizin inhibits cyst growth and delays renal disease progression in a rat model of PKD. Glycosuria was induced by subcutaneous injection of phlorizin in male heterozygous (Cy/+) and wild-type Han:SPRD rats. Phlorizin induced immediate and sustained glycosuria and osmotic diuresis in these rats. Cy/+ rats treated with phlorizin for 5 weeks showed a significant increase in creatinine clearance, a lower 2-kidneys/body weight ratio, a lower renal cyst index, and reduced urinary albumin excretion as compared with vehicle-treated Cy/+ rats. Measurement of Ki67 staining found significantly lower cell proliferation in dilated tubules and cysts of Cy/+ rats treated with phlorizin, as well as a marked inhibition of the activated MAP kinase pathway. In contrast, the mTOR pathway remained unaltered. Phlorizin dose dependently inhibited MAP kinase in cultured tubular epithelial cells from Cy/+ rats. Thus, long-term treatment with phlorizin significantly inhibits cystic disease progression in a rat model of PKD. Hence, induction of glycosuria and osmotic diuresis (glycuresis) by renal sodium-glucose cotransporters inhibition could have a therapeutic effect in polycystic kidney disease.
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