| Summary: | Chronic Kidney Disease (CKD) is a major cause of morbidity and mortality characterized by progressive renal fibrosis, and in extreme cases, renal failure. Human CKD models that replicate the biological complexity of the kidney and CKD are lacking and will be invaluable in identifying drugs to revert and/or prevent fibrosis. To address this unmet need, we developed 3D renal organoids where human induced pluripotent stem cells (hiPSCs) were differentiated to renal progenitors within a renal extracellular matrix (rECM) gel, based on the premise that an rECM could recreate the renal niche to facilitate hiPSC-derived renal progenitor generation. We used mouse kidneys as a source of rECM and identified that superior detergent-mediated decellularization of mouse kidneys was achieved with a combination of 0.5% <i>w</i>/<i>v</i> Sodium Dodecyl Sulphate and 1% <i>v</i>/<i>v</i> Triton-X and mechanical agitation for 60 h. HiPSCs that underwent specification to become metanephric mesenchyme (MM) were subsequently cultured within the rECM gel and, notably, mesenchymal to epithelial transition (MET) was observed, as judged by expression of nephron markers K-cadherin, Nephrin and WT1. These data demonstrate a role for rECM gel in developing human renal organoids from hiPSCs, which will aid the further development of a human disease model for renal fibrosis.
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