[HTML][HTML] Inducible podocyte-specific deletion of CTCF drives progressive kidney disease and bone abnormalities

M Christov, AR Clark, B Corbin, S Hakroush, EP Rhee… - JCI insight, 2018 - ncbi.nlm.nih.gov
M Christov, AR Clark, B Corbin, S Hakroush, EP Rhee, H Saito, D Brooks, E Hesse…
JCI insight, 2018ncbi.nlm.nih.gov
Progressive chronic kidney diseases (CKDs) are on the rise worldwide. However, the
sequence of events resulting in CKD progression remain poorly understood. Animal models
of CKD exploring these issues are confounded by systemic toxicities or surgical
interventions to acutely induce kidney injury. Here we report the generation of a CKD mouse
model through the inducible podocyte-specific ablation of an essential endogenous
molecule, the chromatin structure regulator CCCTC-binding factor (CTCF), which leads to …
Abstract
Progressive chronic kidney diseases (CKDs) are on the rise worldwide. However, the sequence of events resulting in CKD progression remain poorly understood. Animal models of CKD exploring these issues are confounded by systemic toxicities or surgical interventions to acutely induce kidney injury. Here we report the generation of a CKD mouse model through the inducible podocyte-specific ablation of an essential endogenous molecule, the chromatin structure regulator CCCTC-binding factor (CTCF), which leads to rapid podocyte loss (iCTCF pod–/–). As a consequence, iCTCF pod–/–mice develop severe progressive albuminuria, hyperlipidemia, hypoalbuminemia, and impairment of renal function, and die within 8–10 weeks. CKD progression in iCTCF pod–/–mice leads to high serum phosphate and elevations in fibroblast growth factor 23 (FGF23) and parathyroid hormone that rapidly cause bone mineralization defects, increased bone resorption, and bone loss. Dissection of the timeline leading to glomerular pathology in this CKD model led to the surprising observation that podocyte ablation and the resulting glomerular filter destruction is sufficient to drive progressive CKD and osteodystrophy in the absence of interstitial fibrosis. This work introduces an animal model with significant advantages for the study of CKD progression, and it highlights the need for podocyte-protective strategies for future kidney therapeutics.
ncbi.nlm.nih.gov