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• W2024583280 abstract "Ingestion of aristolochic acid (AA) is associated with the development of aristolochic acid nephropathy (AAN), which is characterized by progressive tubulointerstitial fibrosis, chronic renal failure and urothelial cancer. Our previous study showed that bone morphogenetic protein-7 (BMP-7) could attenuate AA-induced epithelial-to-mesenchymal transition (EMT) in human proximal tubule epithelial cells (PTEC). However, how gremlin (a BMP-7 antagonist) antagonizes the BMP-7 action in PTEC remained unsolved. The aim of the current study was to investigate the role of gremlin in AA-induced EMT in PTEC (HK-2 cells). HK-2 cells were treated with AA (10 μmol/L) for periods up to 72 h. Cell viability was determined by tetrazolium dye (MTT) assay. Morphological changes were assessed by phase-contrast microscopy. Markers of EMT, including E-cadherin and α-smooth muscle actin (α-SMA) were detected by indirect immunofluorescence stains. The BMP-7 and gremlin mRNA and protein expression in HK-2 cells were analyzed by quantitative real-time PCR (real-time RT-PCR) and western blotting after exposure to AA. The level of phosphorylated Smad1/5/8, a marker of BMP-7 activity, was also determined by western blot analysis. Cells were transfected with gremlin siRNA to determine the effects of gremlin knockdown on markers of EMT following treatment with AA. Our results indicated that AA-induced EMT was associated with acquisition of fibroblast-like cell shape, loss of E-cadherin, and increases of alpha-SMA and collagen type I. Interestingly, exposure of HK-2 cells to 10 μmol/L AA increased the mRNA and protein expression of gremlin in HK-2 cells. This increase was in parallel with a decrease in BMP-7 expression and a down-regulation of phosphorylated Smad1/5/8 protein levels. Moreover, transfection with siRNA to gremlin was able to recover BMP-7 signaling activity, and attenuate EMT-associated phenotypic changes induced by AA. Together, these observations strongly suggest that gremlin plays a critical role in the modulation of reno-protective action of BMP, and that inhibition of gremlin will be a promising means of developmenting novel treatments for AAN." @default.
• W2024583280 created "2016-06-24" @default.
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• W2024583280 date "2012-07-01" @default.
• W2024583280 modified "2023-10-18" @default.
• W2024583280 title "Gremlin-mediated decrease in bone morphogenetic protein signaling promotes aristolochic acid-induced epithelial-to-mesenchymal transition (EMT) in HK-2 cells" @default.
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• W2024583280 doi "https://doi.org/10.1016/j.tox.2012.04.004" @default.
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