Endothelial-to-mesenchymal transition compromises vascular integrity to induce Myc-mediated metabolic reprogramming in kidney fibrosis
Sara Lovisa, Eliot Fletcher-Sananikone, Hikaru Sugimoto, Janine Hensel, Sharmistha Lahiri, Alexandre Hertig, Gangadhar Taduri, Erica J. Lawson, Rajan Dewar, Ignacio Revuelta, Noritoshi Kato, Chang‐Jiun Wu, Roland L. Bassett, Nagireddy Putluri, Michael Zeisberg, Elisabeth M. Zeisberg, Valerie S. LeBleu, Raghu Kalluri
Abstract
endothelial cells inhibited the emergence of EndMT and improved kidney fibrosis in two different kidney injury/fibrosis mouse models. Suppression of EndMT limited peritubular vascular leakage, reduced tissue hypoxia, and preserved tubular epithelial health and function. Hypoxia, which was exacerbated by EndMT, resulted in increased Myc abundance in tubular epithelial cells, enhanced glycolysis, and suppression of fatty acid oxidation. Pharmacological suppression or epithelial-specific genetic ablation of Myc in tubular epithelial cells ameliorated fibrosis and restored renal parenchymal function and metabolic homeostasis. Together, these findings demonstrate a functional role for EndMT in the response to kidney capillary endothelial injury and highlight the contribution of endothelial-epithelial cross-talk in the development of kidney fibrosis with a potential for therapeutic intervention.