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RNA-seq analysis of proximal tubule specific Fan1 knockout transgenic kidneys subjected to cisplatin injury

ABSTRACT: FAN1 is a DNA endonuclease that we have previously identified as the underlying genetic cause of karyomegalic interstitial nephritis (OMIM: 614817) in humans. In order to deduce the molecular function of FAN1 in the setting of acute kidney injury and progression to chronic kidney disease, we generated a proximal tubule specific Fan1 knockout mouse model and subjected these mice to cisplatin injury. RNA-seq of the transgenic mice kidneys revealed dysregulation of the DNA damage repair pathway as well as cell cycle associated genes. Together, the data supports for a role of Fan1 in DNA damage repair, and that in its absence results in dysfunctional proximal tubule repair and regeneration upon cisplatin injury.

ORGANISM(S): Mus musculus

PROVIDER: GSE163862 | GEO | 2023/05/03

REPOSITORIES: GEO

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Project description:BACKGROUND: Ischemia/reperfusion injury (IRI) is the leading cause of acute kidney injury (AKI). The current standard of care focuses on supporting kidney function, stating the need for more efficient and targeted therapies to enhance repair. Mesenchymal Stromal Cells (MSCs) and their secretome, either as conditioned medium (CM) or extracellular vesicles (EVs), have emerged as promising options for regenerative therapy, however, their full potential in treating AKI remains unknown.METHODS: In this study, we employed an in vitro model of chemically-induced ischemia using antimycin A combined with 2-deoxy-D-glucose to induce ischemic injury in proximal tubule epithelial cells. Afterwards, we evaluated the effects of MSC secretome, CM or EVs obtained from adipose tissue, bone marrow and umbilical cord, on ameliorating the detrimental effects of ischemia. To assess the damage and treatment outcomes, we analyzed cell morphology, mitochondrial health parameters (mitochondrial activity, ATP production, mass and membrane potential) and overall cell metabolism by metabolomics.RESULTS: Our findings show that ischemic injury caused cytoskeletal changes confirmed by disruption of the F-actin network, energetic imbalance as revealed by a 50% decrease in the oxygen consumption rate, increased oxidative stress, mitochondrial dysfunction and reduced cell metabolism. Upon treatment with MSC secretome, the morphological derangements were partly restored and ATP production increased by 40-50%, with umbilical cord-derived EVs being most effective. Furthermore, MSC treatment led to phenotype restoration as indicated by an increase in cell bioenergetics, including increased levels of glycolysis intermediates, as well as an accumulation of antioxidant metabolites.CONCLUSION: Our in vitro model effectively replicated the in vivo-like morphological and molecular changes observed during ischemic injury. Additionally, treatment with MSC secretome ameliorated proximal tubule damage, highlighting its potential as a viable therapeutic option for targeting AKI.

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RNA-seq analysis of proximal tubule specific Fan1 knockout transgenic kidneys subjected to cisplatin injury

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