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- W2967402014 abstract "Chronic kidney disease presents a complex and distinct pathological landscape in men and women, yet this difference is poorly understood. microRNAs are powerful molecular regulators of pathophysiology in the kidney and other organs. We previously reported a significant upregulation of miR-146b-5p in the 5/6 nephrectomy rat model of chronic kidney disease. Here we investigated the sex-specific contribution of miR-146b-5p to renocardiac pathology by generating a novel miR-146b-/- rat and characterized the expression of miR-146b-5p in both wild-type and knockout animals. The 5/6 nephrectomy or sham surgery was performed on rats of each genotype and sex. Renal pathology was examined through gross histology, plasma and urinary analysis of electrolytes and metabolites, and by chronic blood pressure monitoring. Cardiac pathology was monitored via echocardiography and pressure-volume analysis. The miR-146b-/- rats show functional knockout of miR-146b-5p in both the kidney and heart. While 5/6 nephrectomy induced tissue hypertrophy, miR-146b-/- female rats displayed exacerbated renal hypertrophy. Additionally, miR-146b-/- female rats exhibited a marked elevation of renal fibrosis and significant renal dysfunction yet lower blood pressure and less pronounced cardiac remodeling. These phenotypic differences were not exhibited in miR-146b-/- male rats. Ovariectomy ameliorated renal pathology and abolished genotypic differences. In vitro examination of transforming growth factor-β signaling in combination with miR-146b-5p manipulation supports a role for miR-146b-5p in mediating the protective benefit of estrogen from renal pathologies. Thus, our data highlight an important role of miR-146b-5p in modulating kidney disease progression and provide new avenues for the study of sex-specific pathology. Chronic kidney disease presents a complex and distinct pathological landscape in men and women, yet this difference is poorly understood. microRNAs are powerful molecular regulators of pathophysiology in the kidney and other organs. We previously reported a significant upregulation of miR-146b-5p in the 5/6 nephrectomy rat model of chronic kidney disease. Here we investigated the sex-specific contribution of miR-146b-5p to renocardiac pathology by generating a novel miR-146b-/- rat and characterized the expression of miR-146b-5p in both wild-type and knockout animals. The 5/6 nephrectomy or sham surgery was performed on rats of each genotype and sex. Renal pathology was examined through gross histology, plasma and urinary analysis of electrolytes and metabolites, and by chronic blood pressure monitoring. Cardiac pathology was monitored via echocardiography and pressure-volume analysis. The miR-146b-/- rats show functional knockout of miR-146b-5p in both the kidney and heart. While 5/6 nephrectomy induced tissue hypertrophy, miR-146b-/- female rats displayed exacerbated renal hypertrophy. Additionally, miR-146b-/- female rats exhibited a marked elevation of renal fibrosis and significant renal dysfunction yet lower blood pressure and less pronounced cardiac remodeling. These phenotypic differences were not exhibited in miR-146b-/- male rats. Ovariectomy ameliorated renal pathology and abolished genotypic differences. In vitro examination of transforming growth factor-β signaling in combination with miR-146b-5p manipulation supports a role for miR-146b-5p in mediating the protective benefit of estrogen from renal pathologies. Thus, our data highlight an important role of miR-146b-5p in modulating kidney disease progression and provide new avenues for the study of sex-specific pathology. In this issueKidney InternationalVol. 96Issue 6PreviewSeveral omics platforms currently are being used for biomarker discovery. Data integration from multiple platforms while simultaneously accounting for clinical variables is only beginning to be attempted. Kammer and colleagues were interested in identifying prognostic biomarkers for rapid progression of chronic kidney disease (CKD) in patients with type 2 diabetes. They used a novel Bayesian approach to analyze clinical, proteomic, metabolomic, and lipidomic data from patients whose CKD progressed rapidly or remained stable. Full-Text PDF Are women more susceptible to renal dysfunction than men?Kidney InternationalVol. 96Issue 6PreviewIs there any difference in sensitivity to kidney function between men and women? Paterson et al. have focused on sex differences in chronic kidney disease. Surprisingly, their experimental results show that only one microRNA, miR-146b-5p, affected the susceptibility of renocardiac pathology. They generated miR-146b knockout rats and found that miR-146b−/− females developed exacerbated renal hypertrophy and fibrosis and had less cardiac remodeling. Although miR-146b-5p has been reported to be upregulated in various types of cancers, this article reveals the novel role of miR-146b in the kidney. Full-Text PDF" @default.
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- W2967402014 date "2019-12-01" @default.
- W2967402014 modified "2023-10-16" @default.
- W2967402014 title "miR-146b-5p has a sex-specific role in renal and cardiac pathology in a rat model of chronic kidney disease" @default.
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- W2967402014 doi "https://doi.org/10.1016/j.kint.2019.07.017" @default.
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