salvianolic-acid-B and Ureteral-Obstruction

Salvianolic acid B (SAB) can alleviate renal fibrosis and improve the renal function.. To investigate the effect of SAB on renal tubulointerstitial fibrosis and explore its underlying mechanisms.. Male C57 mice were subjected to unilateral ureteric obstruction (UUO) and aristolochic acid nephropathy (AAN) for renal fibrosis indication. Vehicle or SAB (10 mg/kg/d, i.p.) were given consecutively for 2 weeks in UUO mice while 4 weeks in AAN mice. The serum creatinine (Scr) and blood urine nitrogen (BUN) were measured. Masson's trichrome staining and the fibrotic markers (FN and α-SMA) were used to evaluate renal fibrosis. NRK-49F cells exposed to 2.5 ng/mL TGF-β were treated with SAB in the presence or absence of 20 μM 3-DZNep, an inhibitor of EZH2. The protein expression of EZH2, H3k27me3 and PTEN/Akt signaling pathway in renal tissue and NRK-49F cells were measured by Western blots.. SAB significantly improved the levels of Scr by 24.3% and BUN by 35.7% in AAN mice. SAB reduced renal interstitial collagen deposition by 34.7% in UUO mice and 72.8% in AAN mice. Both. SAB might have therapeutic potential on renal fibrosis of CKD through inhibiting EZH2, which encourages further clinical trials.

Topics: Animals; Benzofurans; Depsides; Enhancer of Zeste Homolog 2 Protein; Fibrosis; Histones; Kidney; Kidney Diseases; Male; Mice; Proto-Oncogene Proteins c-akt; PTEN Phosphohydrolase; Transforming Growth Factor beta1; Ureteral Obstruction

To investigate the effect and mechanism of salvianolic acid B (SA-B) on renal interstitial fibrosis in rats induced by unilateral ureteral obstruction (UUO).. 18 male SD rats were randomly divided into 3 groups, 6 in each group. After the models were established, the rats were treated with SA-B for 2 weeks. Then their renal pathology were examined by hight microscope and electron microscopy Protein expression levels of alpha-smooth muscle actin (alpha-SMA) and E-cadherin (E-cad) in the obstructed kidney were analyzed by Western blot and Biochemistry assay.. Pathological examination of the kidney in model group showed tubules lumen widened and many inflammatory cells infiltrated, a part of renal tubule expanded and part of them atrophied. The tubular epithelial cells were karyorrhexis or karyolysis, some tubulars were atrophy. The protein expression of alpha-SMA were significantly up-regulated (P < 0.01) and E-cad were significantly down-regulated (P < 0.01) in the model group. After intervention with SA-B, the renal pathological status in the treatment group was significantly improved, the expression of alpha-SMA were significantly down-regulated (P < 0.05), but E-cad only a little up-regulated (P > 0.05).. SA-B could antagonize renal interstitial fibrosis mainly by maintaining epithelial phenotype, inhibiting the protein of alpha-SMA which is the principal effect cells that are responsible for the progressive kidney fibrosis.

Topics: Actins; Animals; Benzofurans; Blotting, Western; Cadherins; Disease Models, Animal; Fibrosis; Immunohistochemistry; Kidney; Kidney Diseases; Kidney Tubules; Male; Random Allocation; Rats; Rats, Sprague-Dawley; Ureteral Obstruction