scholarly journals Multi-omic Characterization of Human Tubular Epithelial Cell Response to Serum

2021 ◽  
Author(s):  
Kevin A. Lidberg ◽  
Selvaraj Muthusamy ◽  
Mohamed Adil ◽  
Ranita S. Patel ◽  
Lu Wang ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Cellular Proliferation ◽  
Serum Proteins ◽  
Transcriptional Response ◽  
Kidney Injury ◽  
Human Kidney ◽  
Tubular Epithelial Cell ◽  
Kidney Cortex ◽  
Tubular Epithelial Cells ◽  
Cells Cultured

AbstractProteinuria, the spillage of serum proteins into the urine, is a feature of glomerulonephritides, podocyte disorders and diabetic nephropathy. However, the response of tubular epithelial cells to serum protein exposure has not been systematically characterized. Using transcriptomic profiling we studied serum-induced changes in primary human tubular epithelial cells cultured in 3D microphysiological devices. Serum proteins induced cellular proliferation, cytokine secretion and activated a coordinated stress response. We orthogonally confirmed our findings by comparing the transcriptomic and epigenomic landscapes of intact human kidney cortex and isolated tubular epithelial cells cultured in fetal bovine serum. Importantly, key transcriptomic programs in response to either type of serum exposure remained consistent, including comparisons to an established mouse model of kidney injury. This serum-induced transcriptional response was dominated by switching off of nuclear receptor-driven programs and activation of AP-1 and NF-κB signatures in the tubular epigenomic landscape. These features of active regulation were seen at canonical kidney injury genes (HAVCR1) and genes associated with COVID-19 (ACE2, IL6). Our data provide a reference map for dissecting the regulatory and transcriptional response of kidney tubular epithelial cells injury induced by serum.

scholarly journals Long non-coding RNA GAS5 aggravate renal epithelial cell apoptosis in cisplatin-induced AKI by regulating miR-205-5p

2021 ◽  
Author(s):  
Min Zhang ◽  
Hui Bi ◽  
Shaoyan Wang ◽  
Xuejuan Sun ◽  
Yinan Li
Keyword(s):  
Epithelial Cells ◽  
Kidney Injury ◽  
Human Kidney ◽  
Tubular Epithelial Cells ◽  
Renal Tubular Epithelial Cells ◽  
Promoting Effect ◽  
Renal Epithelial Cell ◽  
Non Coding Rna ◽  
Renal Tubular ◽  
Long Non Coding Rna

Abstract Introduction: The present study focuses on the interaction between long non-coding RNA GAS5 and microRNA-205-5p and their roles in cisplatin-induced acute kidney injury. Methods: Human kidney tubular cells (HK-2) were used to simulate acute renal injury induced by cisplatin with the consequent fluctuating expression levels of GAS5 and MIR-205-5p being determined respectively. Furthermore, the modulating effects of miR-205-5p and GAS5 in cisplatin-induced apoptosis of renal tubular epithelial cells and the possible binding sites between them were evaluated. Results: The results depicted that the expression of GAS5 was significantly up-regulated after AKI induced by cisplatin, while inhibiting the increase of expression would alleviate the apoptotic-promoting effect of cisplatin on renal tubular epithelial cells. MIR-205-5p is negatively regulated by GAS5, thus down-regulation of GAS5 will consequently elevate the expression of miR-205-5p and further alleviate the damage of HK-2 cells induced by cisplatin. Conclusions: In conclusion, in cisplatin-induced AKI, the expression of GAS5 was increased and consequently inhibited that of miR-205-5p by direct binding, which eventually aggravate the renal tubular epithelial injury, indicating their potential of being important diagnostic markers and therapeutic targets in the treatment of cisplatin-induced AKI.

scholarly journals A High-Throughput Screen Identifies DYRK1A Inhibitor ID-8 that Stimulates Human Kidney Tubular Epithelial Cell Proliferation

2018 ◽  
Vol 29 (12) ◽  
pp. 2820-2833 ◽  
Author(s):  
Maria B. Monteiro ◽  
Susanne Ramm ◽  
Vidya Chandrasekaran ◽  
Sarah A. Boswell ◽  
Elijah J. Weber ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Epithelial Cell ◽  
Epithelial Cells ◽  
Human Kidney ◽  
Tubular Epithelial Cell ◽  
Epithelial Cell Proliferation ◽  
Tubular Epithelial Cells ◽  
Proximal Tubular Epithelial Cells ◽  
Proximal Tubular

BackgroundThe death of epithelial cells in the proximal tubules is thought to be the primary cause of AKI, but epithelial cells that survive kidney injury have a remarkable ability to proliferate. Because proximal tubular epithelial cells play a predominant role in kidney regeneration after damage, a potential approach to treat AKI is to discover regenerative therapeutics capable of stimulating proliferation of these cells.MethodsWe conducted a high-throughput phenotypic screen using 1902 biologically active compounds to identify new molecules that promote proliferation of primary human proximal tubular epithelial cells in vitro.ResultsThe primary screen identified 129 compounds that stimulated tubular epithelial cell proliferation. A secondary screen against these compounds over a range of four doses confirmed that eight resulted in a significant increase in cell number and incorporation of the modified thymidine analog EdU (indicating actively proliferating cells), compared with control conditions. These eight compounds also stimulated tubular cell proliferation in vitro after damage induced by hypoxia, cadmium chloride, cyclosporin A, or polymyxin B. ID-8, an inhibitor of dual-specificity tyrosine-phosphorylation-regulated kinase 1A (DYRK1A), was the top candidate identified as having a robust proproliferative effect in two-dimensional culture models as well as a microphysiologic, three-dimensional cell culture system. Target engagement and genetic knockdown studies and RNA sequencing confirmed binding of ID-8 to DYRK1A and upregulation of cyclins and other cell cycle regulators, leading to epithelial cell proliferation.ConclusionsWe have identified a potential first-in-class compound that stimulates human kidney tubular epithelial cell proliferation after acute damage in vitro.

Intranuclear Crystals in Regenerating Canine Kidneys

1973 ◽  
Vol 31 ◽  
pp. 412-413
Author(s):  
D.G. Osborne ◽  
L.J. McCormack ◽  
M.O. Magnusson ◽  
W.S. Kiser
Keyword(s):  
Epithelial Cell ◽  
Epithelial Cells ◽  
Tubular Epithelial Cell ◽  
Tubular Epithelial Cells ◽  
Cell Nuclei ◽  
Crystalline Structures ◽  
Small Crystals ◽  
Membrane Bound

During a project in which regenerative changes were studied in autotransplanted canine kidneys, intranuclear crystals were seen in a small number of tubular epithelial cells. These crystalline structures were seen in the control specimens and also in regenerating specimens; the main differences being in size and number of them. The control specimens showed a few tubular epithelial cell nuclei almost completely occupied by large crystals that were not membrane bound. Subsequent follow-up biopsies of the same kidneys contained similar intranuclear crystals but of a much smaller size. Some of these nuclei contained several small crystals. The small crystals occurred at one week following transplantation and were seen even four weeks following transplantation. As time passed, the small crystals appeared to fuse to form larger crystals.

scholarly journals LincRNA-p21 Inhibits Cisplatin-Induced Apoptosis of Human Renal Proximal Tubular Epithelial Cells by Sponging miR-449a

2021 ◽  
pp. 1-7
Author(s):  
Zhen Li ◽  
Gang Hou
Keyword(s):  
Breast Cancer ◽  
Epithelial Cells ◽  
Kidney Injury ◽  
Protective Role ◽  
Tubular Epithelial Cells ◽  
Breast Cancer Patients ◽  
Proximal Tubular Epithelial Cells ◽  
Proximal Tubular ◽  
Renal Proximal Tubular ◽  
Induced Apoptosis

<b><i>Introduction:</i></b> LincRNA-p21 is predicted to interact with miR-449a, which plays a protective role in cisplatin-induced acute kidney injury (CIA). <b><i>Objective:</i></b> This study aimed to analyze the involvement of lincRNA-p21 in breast cancer patients with CIA. <b><i>Methods:</i></b> Levels of lincRNA-p21 in plasma from CIA, triple negative breast cancer, and control groups were measured by performing RT-qPCR. The potential interaction between lincRNA-p21 and miR-449a was first predicted by RT-qPCR. The relationship between lincRNA-p21 and miR-449a was analyzed by overexpression experiment. <b><i>Results:</i></b> We found that lincRNA-p21 is downregulated in CIA. Dual luciferase activity assay showed that lincRNA-p21 and miR-449a can interact with each other, while overexpression of lincRNA-p21 and miR-449a failed to affect the expression of each other. In human renal proximal tubular epithelial cells (HRPTEpCs), cisplatin led to the upregulated miR-449a but downregulated lincRNA-p21. Interestingly, lincRNA-p21 overexpression led to reduced enhancing effects of miR-449a on the cisplatin-induced apoptosis of HRPTEpCs. <b><i>Conclusion:</i></b> Therefore, lincRNA-p21 is downregulated in CIA and may sponge miR-449a to inhibit cisplatin-induced apoptosis of HRPTEpCs.

scholarly journals Proximal tubule-specific overexpression of netrin-1 suppresses acute kidney injury-induced interstitial fibrosis and glomerulosclerosis through suppression of IL-6/STAT3 signaling

2013 ◽  
Vol 304 (8) ◽  
pp. F1054-F1065 ◽  
Author(s):  
Punithavathi Ranganathan ◽  
Calpurnia Jayakumar ◽  
Ganesan Ramesh
Keyword(s):  
Acute Kidney Injury ◽  
Epithelial Cells ◽  
Interstitial Fibrosis ◽  
Kidney Injury ◽  
Transgenic Animals ◽  
Acute Injury ◽  
Tubular Epithelial Cells ◽  
Wild Type ◽  
Proximal Tubular Epithelial Cells ◽  
Proximal Tubular

Acute kidney injury-induced organ fibrosis is recognized as a major risk factor for the development of chronic kidney disease, which remains one of the leading causes of death in the developed world. However, knowledge on molecules that may suppress the fibrogenic response after injury is lacking. In ischemic models of acute kidney injury, we demonstrate a new function of netrin-1 in regulating interstitial fibrosis. Acute injury was promptly followed by a rise in serum creatinine in both wild-type and netrin-1 transgenic animals. However, the wild-type showed a slow recovery of kidney function compared with netrin-1 transgenic animals and reached baseline by 3 wk. Histological examination showed increased infiltration of interstitial macrophages, extensive fibrosis, reduction of capillary density, and glomerulosclerosis. Collagen IV and α-smooth muscle actin expression was absent in sham-operated kidneys; however, their expression was significantly increased at 2 wk and peaked at 3 wk after reperfusion. These changes were reduced in the transgenic mouse kidney, which overexpresses netrin-1 in proximal tubular epithelial cells. Fibrosis was associated with increased expression of IL-6 and extensive and chronic activation of STAT3. Administration of IL-6 exacerbated fibrosis in vivo in wild-type, but not in netrin-1 transgenic mice kidney and increased collagen I expression and STAT3 activation in vitro in renal epithelial cells subjected to hypoxia-reoxygenation, which was suppressed by netrin-1. Our data suggest that proximal tubular epithelial cells may play a prominent role in interstitial fibrosis and that netrin-1 could be a useful therapeutic agent for treating kidney fibrosis.

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