1. Single-Cell Transcriptomics Reveal Disrupted Kidney Filter Cell-Cell Interactions after Early and Selective Podocyte Injury
- Author
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Mónica S. Montesinos, Lan Nguyen, Yiming Zhou, Anna Greka, Abbe R. Clark, Jamie L. Marshall, Haiqi Chen, and Fei Chen
- Subjects
Mice, Knockout ,Kidney ,Mesangial cell ,Podocytes ,Cell ,Regular Article ,Cell Communication ,Biology ,Pathology and Forensic Medicine ,Cell biology ,Podocyte ,Endothelial stem cell ,Mice ,medicine.anatomical_structure ,Downregulation and upregulation ,CTCF ,medicine ,Animals ,Renal Insufficiency, Chronic ,Single-Cell Analysis ,Transcriptome ,Intracellular - Abstract
The health of the kidney filtration barrier requires communication among podocytes, endothelial cells, and mesangial cells. Disruption of these cell-cell interactions is thought to contribute to disease progression in chronic kidney diseases (CKDs). Podocyte ablation via doxycycline-inducible deletion of an essential endogenous molecule, CTCF [inducible podocyte-specific CTCF deletion (iCTCF(pod−/−))], is sufficient to drive progressive CKD. However, the earliest events connecting podocyte injury to disrupted intercellular communication within the kidney filter remain unclear. Single-cell RNA sequencing of kidney tissue from iCTCF(pod−/−) mice after 1 week of doxycycline induction was performed to generate a map of the earliest transcriptional effects of podocyte injury on cell-cell interactions at single-cell resolution. A subset of podocytes had the earliest signs of injury due to disrupted gene programs for cytoskeletal regulation and mitochondrial function. Surviving podocytes up-regulated collagen type IV ɑ5, causing reactive changes in integrin expression in endothelial populations and mesangial cells. Intercellular interaction analysis revealed several receptor-ligand-target gene programs as drivers of endothelial cell injury and abnormal matrix deposition. This analysis reveals the earliest disruptive changes within the kidney filter, pointing to new, actionable targets within a therapeutic window that may allow us to maximize the success of much needed therapeutic interventions for CKDs.
- Published
- 2021