AI Article Synopsis
- TGF-β is crucial in the progression of podocyte diseases, but how it signals in these cells isn't well understood.
- Researchers used mice without Myo1c in podocytes and found they were resistant to renal injuries caused by substances like Adriamycin, indicating Myo1c's importance in TGF-β signaling.
- The study revealed that nuclear Myo1c regulates TGF-β pathways and affects the expression of critical genes like GDF-15, linking Myo1c to podocyte injury and suggesting that targeting this regulation could help treat related kidney diseases.
Article Abstract
Transforming growth factor-β (TGF-β) is known to play a critical role in the pathogenesis of many progressive podocyte diseases. However, the molecular mechanisms regulating TGF-β signaling in podocytes remain unclear. Using a podocyte-specific myosin (Myo)1c knockout, we demonstrate whether Myo1c is critical for TGF-β-signaling in podocyte disease pathogenesis. Specifically, podocyte-specific Myo1c knockout mice were resistant to fibrotic injury induced by Adriamycin or nephrotoxic serum. Further, loss of Myo1c also protected from injury in the TGF-β-dependent unilateral ureteral obstruction mouse model of renal interstitial fibrosis. Mechanistic analyses showed that loss of Myo1c significantly blunted TGF-β signaling through downregulation of canonical and non-canonical TGF-β pathways. Interestingly, nuclear rather than the cytoplasmic Myo1c was found to play a central role in controlling TGF-β signaling through transcriptional regulation. Differential expression analysis of nuclear Myo1c-associated gene promoters showed that nuclear Myo1c targeted the TGF-β responsive gene growth differentiation factor (GDF)-15 and directly bound to the GDF-15 promoter. Importantly, GDF15 was found to be involved in podocyte pathogenesis, where GDF15 was upregulated in glomeruli of patients with focal segmental glomerulosclerosis. Thus, Myo1c-mediated regulation of TGF-β-responsive genes is central to the pathogenesis of podocyte injury. Hence, inhibiting this process may have clinical application in treating podocytopathies.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6589397 | PMC |
| http://dx.doi.org/10.1016/j.kint.2019.02.014 | DOI Listing |
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