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Tubule epithelial cell

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https://www.readbyqxmd.com/read/28724612/regulation-of-pdz-domain-containing-1-pdzk1-expression-by-hepatocyte-nuclear-factor-1-alpha-hnf1%C3%AE-in-human-kidney
#1
Katharina Prestin, Janine Hussner, Celio Ferreira, Isabell Seibert, Vivien Breitung, Uwe Zimmermann, Henriette Elisabeth Meyer Zu Schwabedissen
In the renal proximal tubule the secretion and reabsorption of glomerularly filtrated compounds is realized by a functional network of uptake and efflux transporters. The activity and localization of several transporters expressed at the apical tubular membrane is regulated by the membrane associated protein PDZ domain containing 1 (PDZK1). We aimed to characterize the transcriptional regulation of this modulator of renal transport. Coexpression analyses of PDZK1 and putative regulators were performed using human kidney samples...
July 19, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28718802/ouabain-protects-human-renal-cells-against-the-cytotoxic-effects-of-shiga-toxin-type-2-and-subtilase-cytotoxin
#2
María M Amaral, Magalí C Girard, Romina S Álvarez, Adrienne W Paton, James C Paton, Horacio A Repetto, Flavia Sacerdoti, Cristina A Ibarra
Hemolytic uremic syndrome (HUS) is one of the most common causes of acute renal failure in children. The majority of cases are associated with Shiga toxin (Stx)-producing Escherichia coli (STEC). In Argentina, HUS is endemic and presents the highest incidence rate in the world. STEC strains expressing Stx type 2 (Stx2) are responsible for the most severe cases of this pathology. Subtilase cytotoxin (SubAB) is another STEC virulence factor that may contribute to HUS pathogenesis. To date, neither a licensed vaccine nor effective therapy for HUS is available for humans...
July 18, 2017: Toxins
https://www.readbyqxmd.com/read/28714912/urinary-excretion-of-tetrodotoxin-modeled-in-a-porcine-renal-proximal-tubule-epithelial-cell-line-llc-pk%C3%A2
#3
Takuya Matsumoto, Yui Ishizaki, Keika Mochizuki, Mitsuru Aoyagi, Yoshiharu Mitoma, Shoichiro Ishizaki, Yuji Nagashima
This study examined the urinary excretion of tetrodotoxin (TTX) modeled in a porcine renal proximal tubule epithelial cell line, LLC-PK₁. Time course profiles of TTX excretion and reabsorption across the cell monolayers at 37 °C showed that the amount of TTX transported increased linearly for 60 min. However, at 4 °C, the amount of TTX transported was approximately 20% of the value at 37 °C. These results indicate that TTX transport is both a transcellular and carrier-mediated process. Using a transport inhibition assay in which cell monolayers were incubated with 50 µM TTX and 5 mM of a transport inhibitor at 37 °C for 30 min, urinary excretion was significantly reduced by probenecid, tetraethylammonium (TEA), l-carnitine, and cimetidine, slightly reduced by p-aminohippuric acid (PAH), and unaffected by 1-methyl-4-phenylpyridinium (MPP+), oxaliplatin, and cefalexin...
July 17, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28714373/targeting-mir-21-decreases-expression-of-multi-drug-resistant-genes-and-promotes-chemosensitivity-of-renal-carcinoma
#4
Kelly Gaudelot, Jean-Baptiste Gibier, Nicolas Pottier, Brigitte Hémon, Isabelle Van Seuningen, François Glowacki, Xavier Leroy, Christelle Cauffiez, Viviane Gnemmi, Sébastien Aubert, Michaël Perrais
Renal cell carcinoma, the most common neoplasm of adult kidney, accounts for about 3% of adult malignancies and is usually highly resistant to conventional therapy. MicroRNAs are a class of small non-coding RNAs, which have been previously shown to promote malignant initiation and progression. In this study, we focused our attention on miR-21, a well described oncomiR commonly upregulated in cancer. Using a cohort of 99 primary renal cell carcinoma samples, we showed that miR-21 expression in cancer tissues was higher than in adjacent non-tumor tissues whereas no significant difference was observed with stages, grades, and metastatic outcome...
July 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28709639/ganoderma-triterpenes-retard-renal-cyst-development-by-downregulating-ras-mapk-signaling-and-promoting-cell-differentiation
#5
Limin Su, Liying Liu, Yingli Jia, Lei Lei, Jiangfeng Liu, Shuai Zhu, Hong Zhou, Ruoyun Chen, Hua Ann Jenny Lu, Baoxue Yang
Autosomal dominant polycystic kidney disease (ADPKD) is a common monogenetic disease characterized by the progressive development of renal cysts with further need for effective therapy. Here our aim was to investigate the effect of Ganoderma triterpenes (GT) on the development of kidney cysts. Importantly, GT attenuated cyst development in two mouse models of ADPKD with phenotypes of severe cystic kidney disease. Assays for tubulogenesis showed that GT promoted epithelial tubule formation in MDCK cells, suggesting a possible effect on epithelial cell differentiation...
July 11, 2017: Kidney International
https://www.readbyqxmd.com/read/28709637/tubulointerstitial-fibrosis-can-sensitize-the-kidney-to-subsequent-glomerular-injury
#6
Beom Jin Lim, Jae Won Yang, Jun Zou, Jianyong Zhong, Taiji Matsusaka, Ira Pastan, Ming-Zhi Zhang, Raymond C Harris, Hai-Chun Yang, Agnes B Fogo
Chronic glomerular injury is associated with eventual development of tubulointerstitial fibrosis. Here we aimed to assess whether, and how, mild chronic tubulointerstitial injury affects glomeruli. For this, we generated mice expressing different toxin receptors, one on their proximal tubular epithelial cells (diphtheria toxin receptor [DTR]) and the other only on podocytes (human CD25 [IL-2R] driven by the nephrin promoter [Nep25]), allowing serial induction of tubule-specific and glomerular (podocyte)-specific injury, respectively...
July 12, 2017: Kidney International
https://www.readbyqxmd.com/read/28707079/down-regulation-of-mir-23a-inhibits-high-glucose-induced-emt-and-renal-fibrogenesis-by-up-regulation-of-snon
#7
Haiping Xu, Fuyun Sun, Xiuli Li, Lina Sun
It has been reported that transforming growth factor-β1 (TGF-β1) signaling plays an important role in the development of diabetic nephropathy (DN). The nuclear transcription co-repressor Ski-related novel protein N (SnoN) is a critical negative regulator of TGF-β1/Smad signal pathway, involving in tubule epithelial-mesenchymal transition (EMT), extracellular matrix (ECM) accumulation, and tubulointerstitial fibrosis. In this study, we focused on miR-23a as a regulator of SnoN. Our purpose is to study the effects of miR-23a on high glucose (HG)-induced EMT process and ECM deposition in HK2 cells...
July 13, 2017: Human Cell
https://www.readbyqxmd.com/read/28705935/forkhead-box-o3-foxo3-regulates-kidney-tubular-autophagy-following-urinary-tract-obstruction
#8
Ling Li, Ronald Zviti, Catherine Ha, Zhao V Wang, Joseph A Hill, Fangming Lin
Autophagy has been shown to be important for normal homeostasis and adaptation to stress in the kidney. Yet, the molecular mechanisms regulating renal epithelial autophagy are not fully understood. Here, we explored the role of the stress-responsive transcription factor forkhead box O3 (FoxO3) in mediating injury-induced proximal tubular autophagy in mice with unilateral ureteral obstruction (UUO). We show that following UUO, FoxO3 is activated and displays nuclear expression in the hypoxic proximal tubules exhibiting high levels of autophagy...
July 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28701516/blocking-tgf-%C3%AE-and-%C3%AE-catenin-epithelial-crosstalk-exacerbates-ckd
#9
Stellor Nlandu-Khodo, Surekha Neelisetty, Melanie Phillips, Marika Manolopoulou, Gautam Bhave, Lauren May, Peter E Clark, Haichun Yang, Agnes B Fogo, Raymond C Harris, M Mark Taketo, Ethan Lee, Leslie S Gewin
The TGF-β and Wnt/β-catenin pathways have important roles in modulating CKD, but how these growth factors affect the epithelial response to CKD is not well studied. TGF-β has strong profibrotic effects, but this pleiotropic factor has many different cellular effects depending on the target cell type. To investigate how TGF-β signaling in the proximal tubule, a key target and mediator of CKD, alters the response to CKD, we injured mice lacking the TGF-β type 2 receptor specifically in this epithelial segment...
July 12, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28680822/paricalcitol-attenuates-lipopolysaccharide-induced-inflammation-and-apoptosis-in-proximal-tubular-cells-through-the-prostaglandin-e2-receptor-ep4
#10
Yu Ah Hong, Keum Jin Yang, So Young Jung, Yoon Kyung Chang, Cheol Whee Park, Chul Woo Yang, Suk Young Kim, Hyeon Seok Hwang
BACKGROUND: Vitamin D is considered to exert a protective effect on various renal diseases but its underlying molecular mechanism remains poorly understood. This study aimed to determine whether paricalcitol attenuates inflammation and apoptosis during lipopolysaccharide (LPS)-induced renal proximal tubular cell injury through the prostaglandin E2 (PGE2) receptor EP4. METHODS: Human renal tubular epithelial (HK-2) cells were pretreated with paricalcitol (2 ng/mL) for 1 hour and exposed to LPS (1 μg/mL)...
June 2017: Kidney Research and Clinical Practice
https://www.readbyqxmd.com/read/28679080/renal-cystic-adenocarcinoma-in-a-flowerhorn-fish-with-metastatic-involvement-of-the-spleen
#11
Hooman Rahmati-Holasoo, Sara Shokrpoor, Majid Masoudifard, HosseinAli Ebrahimzadeh Mousavi, Ali Haddadi, Amir Tavakkoli
A 480 g flowerhorn fish hybrid cichlid with severe bilateral abdominal swelling, bulla-like structures on the skin, bilateral exophthalmia and prolapsed intestine was presented. Radiographs showed a compression of the posterior part of swim bladder and abdominal distention. Ultrasonography of visceral organs showed a heterogenous mass with hypo to anechoic polycystic parenchyma and free fluid in abdominal cavity. At necropsy free fluid in the abdominal cavity and a large polycystic mass, originating from the posterior kidney, was observed...
July 5, 2017: Journal of Aquatic Animal Health
https://www.readbyqxmd.com/read/28677006/application-of-noninvasive-functional-imaging-to-monitor-the-progressive-changes-in-kidney-diffusion-and-perfusion-in-contrast-induced-acute-kidney-injury-rats-at-3-0-t
#12
Bin Zhang, Yuhao Dong, Baoliang Guo, Wenbo Chen, Fusheng Ouyang, Zhouyang Lian, Jing Liu, Shuixing Zhang
OBJECTIVES: Contrast-induced acute kidney injury is a prevalent cause of renal failure, and the noninvasive tools to monitor its progress are lacking. We applied intravoxel incoherent motion (IVIM) DWI to measure the progressive changes in kidney diffusion and perfusion of CI-AKI. METHODS: Twenty-four rats received Iopromide (370 mg/ml, 1600 mg iodine/kg) to induce CI-AKI. IVIM DWI was performed on rats (n = 6) at 24 h prior to and 12, 24, 48, 72, and 96 h after the injection using a 3...
July 4, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28674456/pax2-is-dispensable-for-in-vitro-nephron-formation-from-human-induced-pluripotent-stem-cells
#13
Yusuke Kaku, Atsuhiro Taguchi, Shunsuke Tanigawa, Fahim Haque, Tetsushi Sakuma, Takashi Yamamoto, Ryuichi Nishinakamura
The kidney is formed by reciprocal interactions between the nephron progenitor and the ureteric bud, the former of which gives rise to the epithelia of nephrons consisting of glomeruli and renal tubules. The transcription factor PAX2 is essential for this mesenchymal-to-epithelial transition of nephron progenitors, as well as ureteric bud lineage development, in mice. PAX2 mutations in humans cause renal coloboma syndrome. We previously reported the induction of nephron progenitors and three-dimensional nephron structures from human induced pluripotent stem (iPS) cells...
July 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28659153/advanced-glycation-end-products-ages-increase-renal-lipid-accumulation-a-pathogenic-factor-of-diabetic-nephropathy-dn
#14
Yang Yuan, Hong Sun, Zilin Sun
BACKGROUND: Advanced glycation end products (AGEs) are pathogenic factors of diabetic nephropathy (DN), causing renal damage in various ways. The aim of this study is to investigate the ectopic lipid accumulation caused by AGEs in human renal tubular epithelial cell line (HK-2) cells and the kidney of type 2 diabetic rats. METHODS: In vivo study, diabetes was induced in male Sprague-Dawley rats through intraperitoneal injection of high-fat/high-sucrose diet and low-dose streptozocin (STZ)...
June 28, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28646317/di-n-butyl-phthalate-prompts-interruption-of-spermatogenesis-steroidogenesis-and-fertility-associated-with-increased-testicular-oxidative-stress-in-adult-male-rats
#15
Giribabu Nelli, Sreenivasula Reddy Pamanji
Di-n-butyl phthalate (DBP) is extensively used as plasticizer, and it was ubiquitary released into the environment. The present study was aimed to investigate the effect of DBP on reproductive competence in adult male rats. Adult male rats were received corn oil or DBP injection intraperitoneally (ip) at 100 and 500 mg/kg body weight on 90, 97, 104, and 111 days. Following completion of the experimental period, adult male rats were cohabitated with untreated proestrus female rats for determination of fertilization capacity...
June 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28644734/high-throughput-phenotypic-screening-of-kinase-inhibitors-to-identify-drug-targets-for-polycystic-kidney-disease
#16
Tijmen H Booij, Hester Bange, Wouter N Leonhard, Kuan Yan, Michiel Fokkelman, Steven J Kunnen, Johannes G Dauwerse, Yu Qin, Bob van de Water, Gerard J P van Westen, Dorien J M Peters, Leo S Price
Polycystic kidney disease (PKD) is a prevalent disorder characterized by renal cysts that lead to kidney failure. Various signaling pathways have been targeted to stop disease progression, but most interventions still focus on alleviating PKD-associated symptoms. The mechanistic complexity of the disease, as well as the lack of functional in vitro assays for compound testing, has made drug discovery for PKD challenging. To identify modulators of PKD, Pkd1(-/-) kidney tubule epithelial cells were applied to a scalable and automated 3D cyst culture model for compound screening, followed by phenotypic profiling to determine compound efficacy...
June 1, 2017: SLAS Discovery
https://www.readbyqxmd.com/read/28640852/differential-roles-of-3-hydroxyflavone-and-7-hydroxyflavone-against-nicotine-induced-oxidative-stress-in-rat-renal-proximal-tubule-cells
#17
Bidisha Sengupta, Mehdi Sahihi, Monireh Dehkhodaei, Darrian Kelly, Istvan Arany
Plant flavonoids are well known as antioxidants against oxidative stress induced by exposure to external pollutants. Nicotine (NIC) is one of those agents which increases renal oxidative stress, an important factor in the pathogenesis of renal epithelial injury in smokers. Although several studies had been conducted on flavonoids and oxidative stress, the mechanism of the protective pathways are not fully understood. Here, we present studies on antioxidant properties of two mono-hydroxyflavone isomers, 3-hydroxyflanove (3HF)- and 7-hydroxyflavone (7HF), against nicotine-associated oxidative stress and injury in cultured renal proximal tubule cells and correlate their antioxidant properties with their chemical structure...
2017: PloS One
https://www.readbyqxmd.com/read/28640449/polycystic-kidney-disease
#18
Joseph Ghata, Benjamin D Cowley
Renal cysts, which arise from renal tubules, can be seen in a variety of hereditary and nonhereditary entities. Common mechanisms associated with renal cyst formation include increased cell proliferation, epithelial fluid secretion, and extracellular matrix remodeling. Hereditary polycystic kidney disease (PKD) is seen as a component of numerous diseases. Autosomal dominant (AD) PKD is the most common potentially fatal hereditary disease in humans, causes renal failure in approximately 50% of affected individuals, and accounts for approximately 5% of end stage renal disease cases in the United States...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28630354/not-all-cells-are-equal-effects-of-temperature-and-sex-on-the-size-of-different-cell-types-in-the-madagascar-ground-gecko-paroedura-picta
#19
Marcin Czarnoleski, Anna Maria Labecka, Zuzana Starostová, Anna Sikorska, Elżbieta Bonda-Ostaszewska, Katarzyna Woch, Lukáš Kubička, Lukáš Kratochvíl, Jan Kozlowski
Cell size plays a role in evolutionary and phenotypically plastic changes in body size. To examine this role, we measured the sizes of seven cell types of geckos (Paroedura picta) reared at three constant temperatures (24, 27, and 30 °C). Our results show that the cell size varies according to the body size, sex and developmental temperature, but the pattern of this variance depends on the cell type. We identified three groups of cell types, and the cell sizes changed in a coordinated manner within each group...
June 19, 2017: Biology Open
https://www.readbyqxmd.com/read/28626027/selective-activation-of-epidermal-growth-factor-receptor-in-renal-proximal-tubule-induces-tubulointerstitial-fibrosis
#20
Jessica M Overstreet, Yinqiu Wang, Xin Wang, Aolei Niu, Leslie S Gewin, Bing Yao, Raymond C Harris, Ming-Zhi Zhang
Epidermal growth factor receptor (EGFR) has been implicated in the pathogenesis of diabetic nephropathy and renal fibrosis; however, the causative role of sustained EGFR activation is unclear. Here, we generated a novel kidney fibrotic mouse model of persistent EGFR activation by selectively expressing the EGFR ligand, human heparin-binding EGF-like growth factor (HB-EGF), in renal proximal tubule epithelium. Human HB-EGF expression increased tyrosine kinase phosphorylation of EGFR and the subsequent activation of downstream signaling pathways, including ERK and AKT, as well as the profibrotic TGF-β1/SMAD pathway...
June 16, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
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