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Isolation and characterization of progenitor-like cells from human renal proximal tubules

ABSTRACT: The adult kidney has a remarkable capacity for self-renewal upon damage. Whether this regeneration is mediated by dedifferentiating surviving cells or as recently suggested by stem cells has not been unequivocally settled. The stem cell concept is however hampered by lack of consensus regarding the histological localization of and defining markers for these cells. Here, we demonstrate that aldehyde dehydrogenase (ALDH) activity may be used for isolation of cells with progenitor-like characteristics from adult human renal cortical tissue. Gene expression profiling of the isolated ALDHhigh and ALDHlow cell fractions followed by immunohistochemical interrogation of renal tissues enabled us to delineate a tentative progenitor cell population with a scattered distribution in the epithelial layer of the proximal tubules (PT). The cells differed from the surrounding cells by expression of CD133, CD24, vimentin, KRT7, KRT19, and BCL2, and were negative for PT-specific markers. Based on functional and bioinformatic analyses as well as an immunophenotypical resemblance to cells of regenerating tubules we suggest that these cells are endowed with a more robust phenotype, allowing increased resistance to acute renal injury, enabling rapid repopulation of the tubules. The rare intratubular cells also displayed marked transcriptional and immunophenotypical similarities to that of cortical adenomas and papillary renal cell carcinomas, indicating that these renal neoplasms arise through oncogenic transformation of this subset of PT cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE23911 | GEO | 2011/02/01

SECONDARY ACCESSION(S): PRJNA130533

REPOSITORIES: GEO

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Isolation and characterization of progenitor-like cells from human renal proximal tubules

Project description:The adult kidney has a remarkable capacity for self-renewal upon damage. Whether this regeneration is mediated by dedifferentiating surviving cells or as recently suggested by stem cells has not been unequivocally settled. The stem cell concept is however hampered by lack of consensus regarding the histological localization of and defining markers for these cells. Here, we demonstrate that aldehyde dehydrogenase (ALDH) activity may be used for isolation of cells with progenitor-like characteristics from adult human renal cortical tissue. Gene expression profiling of the isolated ALDHhigh and ALDHlow cell fractions followed by immunohistochemical interrogation of renal tissues enabled us to delineate a tentative progenitor cell population with a scattered distribution in the epithelial layer of the proximal tubules (PT). The cells differed from the surrounding cells by expression of CD133, CD24, vimentin, KRT7, KRT19, and BCL2, and were negative for PT-specific markers. Based on functional and bioinformatic analyses as well as an immunophenotypical resemblance to cells of regenerating tubules we suggest that these cells are endowed with a more robust phenotype, allowing increased resistance to acute renal injury, enabling rapid repopulation of the tubules. The rare intratubular cells also displayed marked transcriptional and immunophenotypical similarities to that of cortical adenomas and papillary renal cell carcinomas, indicating that these renal neoplasms arise through oncogenic transformation of this subset of PT cells. Total RNA extracted from three pairs of ALDH-high and ALDH-low cell fractions were hybridized to Illumina humanHT-12 v3.0 Expression BeadChips (Illumina Inc) at the SCIBLU Genomics Centre at Lund University Sweden (http://www.lth.se/sciblu).

2010-11-01 | E-GEOD-23911 | biostudies-arrayexpress

PPARs and c-Myc regulate metabolism of renal tubules

Project description:Different segments of renal tubules have distinct metabolic features and functions, and defective metabolism in renal tubules is involved in the pathobiology of kidney diseases. However, the mechanisms underlying the metabolic regulation in renal tubules remain to be defined. We demonstrated that the renal proximal tubule (PT) has high expression of fatty acid and lipid metabolism enzymes, which is transcriptionally upregulated by abundantly expressed peroxisome proliferator-activated receptor (PPAR)/γ to support active lipid metabolism. In contrast, the renal distal tubule (DT) has elevated glycolytic enzyme expression corresponding with high rates of glycolysis, and this increased expression is mediated by abundantly expressed c-Myc. In addition, Nrf2 upregulated glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, and NADP-dependent malic enzyme 1 expression for NADPH production and antioxidation in the DT. Highly expressed PPARγ transcriptionally enhanced expression of the protease iRhom2 in the PT, which suppressed epidermal growth factor (EGF) expression and secretion, inhibiting EGF receptor activation-dependent glycolytic gene expression and maintaining the low level of glycolysis. PPARγ inhibition reduced iRhom2 expression and increased EGF and GLUT1 expression in the PT in mice, resulting in hypertrophy of renal tubules and inhibited kidney functions, which can be rescued by inhibition of glycolysis via treatment with 2-deoxy-D-glucose. These findings delineate instrumental molecular mechanisms underlying the active lipid metabolism and suppressed glycolysis in the PT and active glycolysis in the DT and reveal critical roles for PPARs and c-Myc in maintaining metabolic homeostasis in the kidney

2018-11-15 | PXD007828 | Pride

Transcriptome Changes of Microdissected Kidney Tubules triggered by Unilateral Nephrectomy [RNA-seq]

Project description:Purpose: Experiments were done in mice undergoing unilateral nephrectomy (UNx) and sham nephrectomy. At specific time points (24 hours and 72 hours) after surgery, the earliest first portion of the kidney proximal tubule (PT-S1) and the cortical collecting duct (CCD) were manually micro-dissected and utilized for transcriptomic analysis by single-tubule small sample RNA-Seq. Methods: We carried out RNA-sequencing in microdissected ealiest portion of proximal tubules (PT-S1) or cortical collecting duct (CCD) from mice with or without (sham) unilateral nephrectomy (UNx). Each group (Sham or UNx) has 3-5 biological replicates. Results and conclusion: RNA-Seq in microdissected PT-S1 at 24 hours showed that peroxisome proliferator-activated receptor alpha (PPARα) target genes were strongly upregulated. RNA-Seq in microdissected PT-S1 at 72 hours showed that cell cycle related genes were strongly upregulated. RNA-Seq in microdissected CCD at both 24 hours and 72 hours showed that cell cycle related genes were strongly upregulated.

2022-08-14 | GSE211021 | GEO

The changes of Chromatin Accessibiliy Triggered by Unilateral Nephrectomy [ATAC-seq]

Project description:Purpose: Experiments were done in mice undergoing unilateral nephrectomy (UNx) and sham nephrectomy. At specific time points (24 hours and 72 hours) after surgery, the earliest first portion of the kidney proximal tubule (PT-S1) and the cortical collecting duct (CCD) were manually micro-dissected and utilized for transcriptomic analysis by single-tubule small sample RNA-Seq and single-tubule ATAC seq. Methods: We carried out ATAC-sequencing in microdissected ealiest portion of proximal tubules (PT-S1) from mice with or without (sham) unilateral nephrectomy (UNx). Each group (Sham or UNx) has 3 biological replicates. Results and conclusion: ATAC-seq peaks in microdissected PT-S1 revealed a predominance of binding site motifs corresponding to PPARα.

2022-08-14 | GSE211022 | GEO

Immunohistochemical Investigation for Renal Tubules in Adaptive and Maladaptive Repair Process after Renal Tubular Injury in the Kidney of Rats

Project description:Acute kidney injury (AKI) have been thought to be reversible condition, however, emerging evidence demonstrated association between AKI and subsequent development of irreversible fibrosis and chronic kidney disease. In the present study, since recovery of AKI depends on renal tubular regeneration, factors expressing in renal tubules in adaptive or maladaptive repair process were investigated to predict reversibility of kidney injury. In the kidney of female F344 rats subjected to ischemia/reperfusion (I/R), regenerative tubules and dilated tubules were observed at 3 and 7 days after I/R. In fibrotic areas of the kidney of male SD rats subjected to I/R, renal tubules were dilated or atrophied. From microarray data of regenerative tubules, survivin, sex-determining region Y (SRY)-box 9 (SOX9), and CD44 were extracted as factors possibly relating to tubular regeneration or fibrosis. Immunohistochmical analysis demonstrated that survivin and SOX9 expressed in regenerative tubules, while SOX9 also expressed in renal tubules in fibrotic area, indicating that survivin and SOX9 contribute renal tubular regeneration, but sustained SOX9 expression may lead fibrosis. CD44 expressed in dilated tubules at day 3 and 7, and tubules in fibrotic area, suggesting that CD44 expressed in maladaptive tubules. These information will be helpful to consider reversibility of kidney injury.

2020-06-01 | GSE148420 | GEO

Gene expression profiles in isolated proximal tubules and whole kidneys of rats after cisplatin-administration

Project description:To clarify the effects of cisplatin (cis-diamminedichloroplatinum II, CDDP) on the gene expression profiles in renal proximal tubules, microarray analyses were carried out using total RNA samples isolated from microdissected proximal tubules and whole kidneys. The molecular events underlying acute kidney injury (AKI) in the proximal tubules of rats with cisplatin-induced nephrotoxicity were successfully clarified with 17,000 transcripts. Renal proximal tubules were isolated under microscopy, and transcriptome data were collected with Rat Genome Survey MicroarrayÂ® (Applied Biosystems)

2013-12-24 | E-GEOD-37133 | biostudies-arrayexpress

Renal progenitor cell gene expression profiling

2009-11-03 | GSE8611 | GEO

CD73 as a therapeutic target of pancreatic neuroendocrine tumor stem cells

Project description:Background: Identification and purification of cancer stem cells (CSCs) lead to new therapeutic targets; however, there has been no study to identify and isolated pancreatic neuroendocrine tumor (pNET) CSC. Therefore the clinical significance and its target remain unknown. This study aimed to identify pNET CSCs and characterize therapeutic candidate for pNET CSCs. Methods: We isolated CSCs sorting by ALDH activity in pNET surgical section and cell lines. We verified whether these cells have the property of stemness in vivo and in vitro. Additionally in order to acquire CSC gene profile, genome-wide gene expression profiles were investigated using a microarray technique. Results: ALDHhigh cells, but not control bulk cells, formed spheres, proliferated in hypoxia as well as normoxia and promoted cell motility, which are features of CSCs. Injection of as few as 10 ALDHhigh cells led to subcutaneous tumor formation, and 105 ALDHhigh cells established metastases but not control bulk cells in mice. Comprehensive gene expression analysis revealed that genes associated with mesenchymal stem cell, including CD73, and epithelial-mesenchymal transition (EMT) were overexpressed in ALDHhigh cells. APCP, which is CD73 inhibitor, inhibited sphere formation and cell motility in ALDHhigh cells in vitro, and tumor growth inhibition were observed in ALDHhigh cells in vivo. Conclusions: We identified ALDHhigh cells of pNET and elucidated that they have stemness property. Furthermore we identified CD73 as a target of ALDHhigh cells. CD73 is a promising novel target of pNET CSCs.

2016-05-23 | GSE62079 | GEO

Transcription profiling of human kidney glomerular and tubular progenitor cells

Project description:Multipotent progenitor cells (MPs) have been observed in human kidneys and particularly in Bowman's capsule and proximal tubules. The kidney owns the ability to repair local damage and renal MPs may play a role in the regenerative processes. Microarray technology was applied to identify differentially expressed genes among resident MPs isolated from glomeruli and tubules of normal renal tissue, renal proximal tubular epithelial cells (RPTECs) and mesenchymal stem cells (MSCs). The results of our analysis represent a starting point for further functional studies. Experiment Overall Design: This study includes three renal tissue samples which were processed to obtain 3 glomerular progenitor populations and 3 tubular ones. Three subcoltures of MSCs and RPTECs were included as well. The differences in gene expression patterns of the 4 cell types were found out.

2009-11-09 | E-GEOD-8611 | biostudies-arrayexpress

Gene expression profiles in cancer stem cells isolated as ALDHhigh cells from human endometrioid adenocarcinoma cells, HEC-1.

Project description:ALDHhigh cells were isolated as aldehyde dehydrogenase high active cells from HEC-1 cells by aldefluor assay. Aldehyde dehydrogenase low cells were isolated as ALDHlow cells. ALDHhigh cells showed higher tumor-initiating ability compared with those in ALDHlow cells. Thus ALDHhigh cells were enriched with cancer stem cells. The gene expression profiles were analyzed by cDNA microarray. ALDHlow cells were used as non-cancer stem cells.

2017-02-03 | E-MTAB-4440 | biostudies-arrayexpress

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