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Zhao, Shuiling; Lo, Chao-Sheng; Miyata, Kana N; Ghosh, Anindya; Zhao, Xin-Ping; Chenier, Isabelle; Cailhier, Jean-Francois; Ethier, Jean; Lattouf, Jean-Baptiste; Filep, Janos G; Ingelfinger, Julie R; Zhang, Shao-Ling; Chan, John S D
Diabetes (New York, N.Y.), 06/2021, Letnik: 70, Številka: 6Journal Article
We investigated the impact of nuclear factor erythroid 2-related factor 2 (Nrf2) overexpression in renal proximal tubular cells (RPTCs) on blood glucose, kidney injury, and sodium-glucose cotransporter 2 (Sglt2) expression in diabetic Akita / transgenic (Tg) mice. Immortalized human RPTCs (HK2) stably transfected with plasmid containing the promoter and human kidneys from patients with diabetes were also studied. Nrf2 overexpression was associated with increased blood glucose, glomerular filtration rate, urinary albumin-to-creatinine ratio, tubulointerstitial fibrosis, and Sglt2 expression in Akita / Tg mice compared with their Akita littermates. In vitro, oltipraz or transfection of cDNA stimulated expression and promoter activity in HK2, and these effects were inhibited by trigonelline or siRNA. The deletion of the -responsive element ( ) in the promoter abolished the stimulatory effect of oltipraz on promoter activity. NRF2 binding to the of the promoter was confirmed by gel mobility shift assay and chromatin immunoprecipitation assays. Kidneys from patients with diabetes exhibited higher levels of NRF2 and SGLT2 in the RPTCs than kidneys from patients without diabetes. These results suggest a link by which NRF2 mediates hyperglycemia stimulation of SGLT2 expression and exacerbates blood glucose and kidney injury in diabetes.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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