Smad4 promotes diabetic nephropathy by modulating glycolysis and OXPHOS

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    Author
    Li, J; Sun, YBY; Chen, W; Fan, J; Li, S; Qu, X; Chen, Q; Chen, R; Zhu, D; Zhang, J; ...
    Date
    2020-02-05
    Source Title
    EMBO Reports
    Publisher
    WILEY
    University of Melbourne Author/s
    Nilsson, Susan
    Affiliation
    Clinical Pathology
    Metadata
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    Document Type
    Journal Article
    Citations
    Li, J., Sun, Y. B. Y., Chen, W., Fan, J., Li, S., Qu, X., Chen, Q., Chen, R., Zhu, D., Zhang, J., Wu, Z., Chi, H., Crawford, S., Oorschot, V., Puelles, V. G., Kerr, P. G., Ren, Y., Nilsson, S. K., Christian, M. ,... Yu, X. (2020). Smad4 promotes diabetic nephropathy by modulating glycolysis and OXPHOS. EMBO REPORTS, 21 (2), https://doi.org/10.15252/embr.201948781.
    Access Status
    Access this item via the Open Access location
    URI
    http://hdl.handle.net/11343/253995
    DOI
    10.15252/embr.201948781
    Open Access URL
    http://irep.ntu.ac.uk/id/eprint/39017/1/1267858_Christian.pdf
    Abstract
    Diabetic nephropathy (DN) is the leading cause of end-stage kidney disease. TGF-β1/Smad3 signalling plays a major pathological role in DN; however, the contribution of Smad4 has not been examined. Smad4 depletion in the kidney using anti-Smad4 locked nucleic acid halted progressive podocyte damage and glomerulosclerosis in mouse type 2 DN, suggesting a pathogenic role of Smad4 in podocytes. Smad4 is upregulated in human and mouse podocytes during DN. Conditional Smad4 deletion in podocytes protects mice from type 2 DN, independent of obesity. Mechanistically, hyperglycaemia induces Smad4 localization to mitochondria in podocytes, resulting in reduced glycolysis and oxidative phosphorylation and increased production of reactive oxygen species. This operates, in part, via direct binding of Smad4 to the glycolytic enzyme PKM2 and reducing the active tetrameric form of PKM2. In addition, Smad4 interacts with ATPIF1, causing a reduction in ATPIF1 degradation. In conclusion, we have discovered a mitochondrial mechanism by which Smad4 causes diabetic podocyte injury.

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