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Translational profiling of proximal tubule in fibrotic kidney

ABSTRACT: Translational profiling of proximal tubule in fibrotic kidney

PROVIDER: PRJNA514912 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8438170.fastq.gz	Fastqsanger.gz
	SRR8438180.fastq.gz	Fastqsanger.gz
	SRR8438190.fastq.gz	Fastqsanger.gz
	SRR8438200.fastq.gz	Fastqsanger.gz
	SRR8438210.fastq.gz	Fastqsanger.gz

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Translational profiling of proximal tubule in fibrotic kidney

Project description:Injury to the proximal tubule plays a central role in the initiation and progression of kidney fibrosis, and rates of chronic kidney disease progresses approximately 50% faster in males compared to females. We applied Translating Ribosome Affinity Purification (TRAP) followed by RNA-sequencing to characterize the cell-specific proximal tubule transcriptional landscape during fibrosis in male vs. female mice.

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Project description:Purpose:Cultured cell lines are widely used for research in the physiology, pathophysiology, toxicology and pharmacology of the renal proximal tubule. The lines that are most appropriate for a given use depend on the genes expressed.We have used modern RNA-sequencing techniques to identify the gene expression profile of 14 different cell lines plus primary cultures of mouse proximal tubule and compare them to transcriptomes of native kidney proximal tubules. Methods: 14 different proximal tubule cell lines were grown on permeable supports under conditions specific for the respective lines. RNA-Seq followed standard procedures. Results and conclusion: Transcripts expressed in cell lines showed variable match to transcripts selectively expressed in native proximal tubule. Opossum kidney (OK) cells displayed the highest percentage match (45%) with pig kidney cells (LLC-PK1) close behind (39%). Much lower percentage matches were seen for various human lines including HK-2 cells (26%) and lines from rodent kidneys (18-23%).An online resource (https://esbl.nhlbi.nih.gov/JBrowse/KCT/) has been created for interrogation of the data.No cell line closely matched the transcriptome of native proximal tubule cells. However, some of the lines tested are suitable for the study of particular metabolic and transport processes seen in the proximal tubule.

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Project description:Epigenetic mechanisms are considered to contribute to diabetic nephropathy by maintaining memory of poor glycemic control during the early stages of diabetes. However, DNA methylation changes in the human kidney are poorly characterized, because of the lack of cell type-specific analysis. We examined DNA methylation in proximal tubules purified from diabetic nephropathy patients and identified differentially methylated CpG sites, given the critical role of proximal tubules in the kidney injury. Hypermethylation was observed at CpG sites annotated to genes responsible for proximal tubule functions, including gluconeogenesis, nicotinamide adenine dinucleotide synthesis, transporters of glucose, water, phosphate, and drugs, in diabetic kidneys, while genes involved in oxidative stress and the cytoskeleton exhibited demethylation. Methylation levels of CpG sites annotated to ACTN1, BCAR1, MYH9, UBE4B, AFMID, TRAF2, TXNIP, FOXO3, and HNF4A were correlated with the estimated glomerular filtration rate, while methylation of the CpG site in RUNX1 was associated with interstitial fibrosis and tubular atrophy. Hypermethylation of G6PC and HNF4A was accompanied by decreased expression in diabetic kidneys. Proximal tubule-specific hypomethylation of metabolic genes related to HNF4A observed in control kidneys was compromised in diabetic kidneys, suggesting a role for aberrant DNA methylation in the dedifferentiation process. Multiple genes with aberrant DNA methylation in diabetes overlapped genes with altered expressions in maladaptive proximal tubule cells, including transcription factors PPARA and RREB1. In conclusion, DNA methylation derangement in the proximal tubules of patients with diabetes may drive phenotypic changes, characterized by inflammatory and fibrotic features, along with impaired function in metabolism and transport.

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Single-nuclear transcriptomics reveals a diversity of proximal tubule cell states in a dynamic response to acute kidney injury.

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