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proximal epithelial tubular

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https://www.readbyqxmd.com/read/29352176/renal-scattered-tubular-like-cells-confer-protective-effects-in-the-stenotic-murine-kidney-mediated-by-release-of-extracellular-vesicles
#1
Xiangyu Zou, Soon Hyo Kwon, Kai Jiang, Christopher M Ferguson, Amrutesh S Puranik, Xiangyang Zhu, Lilach O Lerman
To test the hypothesis that intrinsic renal scattered tubular cells (STC-like cells) contribute to repairing injured tubular epithelial cells (TEC) by releasing extracellular vesicle (EV). EV released from primary cultured pig STC-like cells were confirmed by electron microscopy. Antimycin-A (AMA)-induced injured proximal TEC (PK1 cells) were co-cultured with STC-like cells, STC-like cells-derived EV, or EV-free conditioned-medium for 3 days. Cellular injury, oxidative stress and mitochondrial function were assessed...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348484/activation-of-ca2-sensing-receptor-as-a-protective-pathway-to-reduce-cadmium-induced-cytotoxicity-in-renal-proximal-tubular-cells
#2
Jie Gu, Shuya Dai, Yanmin Liu, Haitao Liu, Yao Zhang, Xingqi Ji, Feng Yu, Yang Zhou, Liang Chen, William Ka Fai Tse, Chris Kong Chu Wong, Binghai Chen, Haifeng Shi
Cadmium (Cd), as an extremely toxic metal could accumulate in kidney and induce renal injury. Previous studies have proved that Cd impact on renal cell proliferation, autophagy and apoptosis, but the detoxification drugs and the functional mechanism are still in study. In this study, we used mouse renal tubular epithelial cells (mRTECs) to clarify Cd-induced toxicity and signaling pathways. Moreover, we proposed to elucidate the prevent effect of activation of Ca2+ sensing receptor (CaSR) by Calcimimetic (R-467) on Cd-induced cytotoxicity and underlying mechanisms...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329393/tgf-%C3%AE-mediated-nadph-oxidase-4-dependent-oxidative-stress-promotes-colistin-induced-acute-kidney-injury
#3
Bo Young Jeong, Se-Ra Park, Sungkwon Cho, Seong-Lan Yu, Hoi Young Lee, Chang Gyo Park, Jaeku Kang, Da-Young Jung, Moon Hyang Park, Won-Min Hwang, Sung-Ro Yun, Ju-Young Jung, Se-Hee Yoon
Background: Colistin (polymyxin E) is an important constituent of the polymyxin class of cationic polypeptide antibiotics. Intrarenal oxidative stress can contribute to colistin-induced nephrotoxicity. Nicotinamide adenine dinucleotide 3-phosphate oxidases (Noxs) are important sources of reactive oxygen species. Among the various types of Noxs, Nox4 is predominantly expressed in the kidney. Objectives: We investigated the role of Nox4 and benefit of Nox4 inhibition in colistin-induced acute kidney injury using in vivo and in vitro models...
January 9, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29327458/lead-induced-dna-damage-and-cell-apoptosis-in-human-renal-proximal-tubular-epithelial-cell-attenuation-via-n-acetyl-cysteine-and-tannic-acid
#4
Manushi Siddarth, Diwesh Chawla, Alpana Raizada, Neelam Wadhwa, Basu D Banerjee, Meera Sikka
This study investigates the exposure of lead-induced reactive oxygen species (ROS) generation, DNA damage, and apoptosis and also evaluates the therapeutic intervention using antioxidants in human renal proximal tubular cells (HK-2 cells). Following treatment of HK-2 cells with an increasing concentration of lead nitrate (0-50 μM) for 24 h, the intracellular ROS level increased whereas the GSH level decreased significantly in a dose-dependent manner. Comet assay results revealed that lead nitrate showed the ability to increase the levels of DNA strand breaks in HK-2 cells...
January 12, 2018: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/29319126/autophagy-activation-promotes-removal-of-damaged-mitochondria-and-protects-against-renal-tubular-injury-induced-by-albumin-overload
#5
Jin Tan, Miaohong Wang, Shuling Song, Shuling Miao, Qiang Zhang
Proteinuria (albuminuria) is an important cause of aggravating tubulointerstitial injury. Previous studies have shown that autophagy activation can alleviate renal tubular epithelial cell injury caused by urinary protein, but the mechanism is not clear. Here, we investigated the role of clearance of damaged mitochondria in this protective effect. We found that albumin overload induces a significant increase in turnover of LC3-II and decrease in p62 protein level in renal proximal tubular (HK-2) cells in vitro...
January 10, 2018: Histology and Histopathology
https://www.readbyqxmd.com/read/29304496/the-protective-effect-of-shikonin-on-renal-tubular-epithelial-cell-injury-induced-by-high-glucose
#6
Yuna Tong, Junlan Chuan, Lan Bai, Jianyou Shi, Lei Zhong, Xingmei Duan, Yuxuan Zhu
Hyperglycemia-induced oxidative stress is thought to play a critical role in the pathogenesis of diabetic nephropathy (DN). Treating high-glucose (HG)-induced proximal tubule injury has become a patential therapeutic option to attenuate the onset and progression of DN. The present study aimed to investigate the renoprotective effect of shikonin, the chief active compound extracted from the roots of the traditional Chinese herb Lithospermum erythrorhizon, on HG-induced cytotoxicity in NRK-52E cells. Treating cells with HG significantly reduce cell viability while also significantly increasing content of reactive oxygen species (ROS)...
January 2, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29299951/renal-tubular-epithelial-cells-injury-induced-by-mannitol-and-its-potential-mechanism
#7
Jinwan Shi, Jiuzhan Qian, Hui Li, Hongjun Luo, Wenhong Luo, Zhexuan Lin
Administration of mannitol with high dose could induce extensive isometric renal proximal tubular vacuolization and acute renal failure in clinic. We previously demonstrated that mannitol-induced human kidney tubular epithelial cell (HK-2) injury. The objective of our present work was to further study the cytotoxicity of mannitol in HK-2 cells and its potential mechanism. Cell viability was assessed by an MTT method. Cell morphological changes were observed. Furthermore, levels of malondialdehyde (MDA) and glutathione (GSH) were measured...
November 2018: Renal Failure
https://www.readbyqxmd.com/read/29290941/eucalyptol-ameliorates-snail1-%C3%AE-catenin-dependent-diabetic-disjunction-of-renal-tubular-epithelial-cells-and-tubulointerstitial-fibrosis
#8
Dong Yeon Kim, Min-Kyung Kang, Sin-Hye Park, Eun-Jung Lee, Yun-Ho Kim, Hyeongjoo Oh, Yean-Jung Choi, Young-Hee Kang
Renal tubulointerstitial fibrosis is an important event in the pathogenesis of diabetic nephropathy. Under pathologic conditions, renal tubular epithelial cells undergo transition characterized by loss of cell-cell adhesion and increased cell migration. This study investigated that eucalyptol inhibited tubular epithelial cell disjunction and tubulointerstitial fibrosis stimulated by glucose. Human renal proximal tubular epithelial cells were incubated for up to 72 h in media containing 27.5 mM mannitol as osmotic controls or 33 mM glucose in the presence of 1-20 μM eucalyptol...
December 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/29276099/lethal-3-malignant-brain-tumor-like-2-l3mbtl2-protein-protects-against-kidney-injury-by-inhibiting-the-dna-damage-p53-apoptosis-pathway-in-renal-tubular-cells
#9
Huihui Huang, Chunhua Xu, Yang Wang, Chenling Meng, Wenjing Liu, Yueshui Zhao, Xiao-Ru Huang, Wenxing You, Bo Feng, Zhi-Hua Zheng, Yu Huang, Hui-Yao Lan, Jinzhong Qin, Yin Xia
DNA damage contributes to renal tubular cell death during kidney injury, but how DNA damage in tubular cells is regulated is not fully understood. Lethal (3) malignant brain tumor like 2 (L3MBTL2), a novel polycomb group protein, has been implicated in regulating chromatin architecture. However, the biological functions of L3MBTL2 are largely undefined. Here we found that L3MBTL2 was expressed in the nuclei of renal tubular epithelial cells in mice. Ablation of L3mbtl2 in renal tubular cells resulted in increases in nuclear DNA damage, p53 activation, apoptosis, tubular injury and kidney dysfunction after cisplatin treatment or unilateral ureteral obstruction...
December 21, 2017: Kidney International
https://www.readbyqxmd.com/read/29260413/berberine-protects-hk-2-cells-from-hypoxia-reoxygenation-induced-apoptosis-via-inhibiting-sphk1-expression
#10
Jianrao Lu, Yang Yi, Ronghua Pan, Chuanfu Zhang, Haiyan Han, Jie Chen, Wenrui Liu
Renal ischemia reperfusion injury (RIRI) refers to the irreversible damage for renal function when blood perfusion is recovered after ischemia for an extended period, which is common in clinical surgeries and has been regarded as a major risk for acute renal failures (ARF) that is accompanied with unimaginably high morbidity and mortality. Hypoxia during ischemia followed by reoxygenation via reperfusion serves as a major event contributing to cell apoptosis, which has been widely accepted as the vital pathogenesis in RIRI...
December 19, 2017: Journal of Natural Medicines
https://www.readbyqxmd.com/read/29241623/knockout-of-the-interleukin-36-receptor-protects-against-renal-ischemia-reperfusion-injury-by-reduction-of-proinflammatory-cytokines
#11
Hirofumi Nishikawa, Yoshinori Taniguchi, Tatsuki Matsumoto, Naoki Arima, Mamoru Masaki, Yoshiko Shimamura, Kosuke Inoue, Taro Horino, Shimpei Fujimoto, Kentaro Ohko, Toshihiro Komatsu, Keiko Udaka, Shigetoshi Sano, Yoshio Terada
IL-36, a newly named member of the IL-1 cytokine family, includes 3 isoforms, IL-36α, IL-36β, and IL-36γ, all of which bind to a heterodimer containing the IL-36 receptor (IL-36R). Little is known about the role of the IL-36 axis in acute kidney injury (AKI) pathogenesis. Therefore, we evaluated IL-36 function in the bilateral renal ischemia-reperfusion injury model of AKI using IL-36R knockout and wild-type mice. IL-36R was found to be expressed in the kidney, mainly in proximal tubules. In IL-36R knockout mice, plasma creatinine, blood urea nitrogen, and IL-6 levels after ischemia-reperfusion injury were significantly lower than those in wild-type mice...
December 11, 2017: Kidney International
https://www.readbyqxmd.com/read/29240625/orbital-shear-stress-regulates-differentiation-and-barrier-function-of-primary-renal-tubular-epithelial-cells
#12
Nicholas Ferrell, Jin Cheng, Simeng Miao, Shuvo Roy, William H Fissell
Primary cells cultured in vitro gradually lose features characteristic of the in vivo phenotype. Culture techniques that help maintain cell-specific phenotype are advantageous for development of tissue engineered and bioartificial organs. Here we evaluated the phenotype of primary human renal tubule epithelial cells subjected to fluid shear stress by culturing the cells on an orbital shaker. Transepithelial electrical resistance (TEER), cell density, and gene and protein expression of proximal tubule-specific functional markers were measured in cells subjected to orbital shear stress...
December 11, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29240283/proximal-tubular-epithelial-cells-preferentially-endocytose-covalently-modified-albumin-compared-to-native-albumin
#13
Nguyen D K Ly, Greg H Tesch, David J Nikolic-Paterson, Philip Poronnik
AIM: Albumin can be covalently modified at surface lysine residues and thus the circulation contains a mixture of native albumin (i.e. not modified) and albumin with varying degrees of modification. Uptake and lysosomal degradation of glomerular filtered albumin by proximal tubular cells via the megalin scavenger receptor is considered an important mechanism to limit albumin loss in the urine. However, whether this is a general mechanism of tubular uptake of albumin or if this is restricted to modified albumin is unknown...
December 14, 2017: Nephrology
https://www.readbyqxmd.com/read/29234448/aristolochic-acid-induced-autophagy-promotes-epithelial-to-myofibroblast-transition-in-human-renal-proximal-tubule-epithelial-cells
#14
Yu-Lin Man, Hong-Liang Rui, Yi-Pu Chen, Guo-Qin Wang, Li-Jun Sun, Hong Cheng
Autophagy plays an essential role in cellular homeostasis in kidney. Previous studies have found that aristolochic acid (AA) can induce autophagy of renal tubular epithelial cells and epithelial-to-myofibroblast transition (EMT). However, the relationship between AA-induced autophagy and EMT is unclear. Our results showed that, after AA stimulation, the appearance of autophagy preceded EMT. Autophagy of HKC cells began to increase gradually from the 3rd hour, reached the peak at 12th hour, and then weakened gradually until 36th hour; the EMT process of HKC continued to increase from 6th hour to 36th hour after AA stimulation...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29222172/proximal-aberrant-crypt-foci-associate-with-synchronous-neoplasia-and-are-primed-for-neoplastic-progression
#15
David A Drew, Allen Mo, James J Grady, Richard G Stevens, Joel B Levine, Bruce M Brenner, Joseph C Anderson, Faripour Forouhar, Michael J O'Brien, Thomas J Devers, Daniel W Rosenberg
Aberrant crypt foci (ACF) are the earliest morphologically identifiable lesion found within the human colon. Despite their relatively high frequency in the distal colon, few studies have examined the molecular characteristics of ACF within the proximal colon. In the following study, clinical participants (n=184) were screened for ACF using high-definition chromoendoscopy with contrast dye-spray. Following pathological confirmation, ACF biopsies were subjected to laser-capture microdissection (LCM) and epithelial cells were evaluated for somatic mutations with a customized colorectal cancer mutation panel using DNA-mass spectrometry...
December 8, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/29215709/the-potential-role-of-aquaporin-1-on-aristolochic-acid-i-induced-epithelial-mesenchymal-transition-on-hk-2-cells
#16
Ji Li, Mincheng Zhang, Yong Mao, Yimao Li, Xiaoxia Zhang, Xuehan Peng, Feng Yu
Aristolochic acid I (AA-I), one of the main active components in Aristolochaia herbs, may induce aristolochic acid nephropathy (AAN). Renal interstitial fibrosis is one of the most typical features of AAN. To investigate the mechanism of Aristolochic acid I (AA-I) -induced renal epithelial-mesenchymal transition (EMT) and determine the role of aquaporin-1 (AQP1) in this process, we established an AA-I-induced EMT model in human proximal tubular epithelial cells (HK-2 cells). Morphological examination, MTT assay, and Western blot analysis were performed...
December 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29214717/bisphenol-a-is-an-exogenous-toxin-that-promotes-mitochondrial-injury-and-death-in-tubular-cells
#17
Enrique Bosch-Panadero, Sebastian Mas, Esther Civantos, Pedro Abaigar, Vanesa Camarero, Alberto Ruiz-Priego, Alberto Ortiz, Jesus Egido, Emilio González-Parra
BACKGROUND: Uremic toxins that accumulate in chronic kidney disease (CKD) contribute to CKD complications, such as CKD progression. Bisphenol A (BPA) is a ubiquitous environmental toxin, structurally related with p-cresol, that accumulates in CKD. Our aim was to characterize the nephrotoxic potential of BPA. Specifically, we addressed BPA toxicity over energy-demanding proximal tubular cells. METHODS: Cell death and oxidative stress were evaluated by flow cytometry and confocal microscopy in HK-2 human proximal tubular epithelial cells...
December 7, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/29207627/orellanine-specifically-targets-renal-clear-cell-carcinoma
#18
Lisa Buvall, Heidi Hedman, Alina Khramova, Deman Najar, Lovisa Bergwall, Kerstin Ebefors, Carina Sihlbom, Sven Lundstam, Anders Herrmann, Hanna Wallentin, Emelie Roos, Ulf A Nilsson, Martin Johansson, Jan Törnell, Börje Haraldsson, Jenny Nyström
Renal cell carcinoma (RCC), arising from the proximal tubule in the kidney, accounts for approximately 85% of kidney cancers and causes over 140,000 annual deaths worldwide. In the last decade, several new therapies have been identified for treatment of metastatic RCC. Although these therapies increase survival time compared to standard care, none of them has curative properties. The nephrotoxin orellanine specifically targets proximal tubular epithelial cells, leaving other organs unaffected. We therefore hypothesized that the selective toxicity of orellanine extends to clear cell RCC (ccRCC) cells since they emanate from proximal tubular cells...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29207166/pentosan-polysulfate-ameliorates-apoptosis-and-inflammation-by-suppressing-activation-of-the-p38-mapk-pathway-in-high-glucose%C3%A2-treated-hk%C3%A2-2-cells
#19
Ping Chen, Yang Yuan, Tianying Zhang, Bo Xu, Qing Gao, Tianjun Guan
The apoptosis of tubular epithelial cells in diabetic nephropathy (DN) is commonly observed in human renal biopsies. Inflammation plays a key role in DN, and pentosan polysulfate (PPS) has been shown to largely attenuate the inflammation of nephropathy in aging diabetic mice. p38 mitogen‑activated protein kinase (p38 MAPK) plays a crucial role in tissue inflammation and cell apoptosis, and it is activated by hyperglycemia. In the present study, high glucose (HG)‑treated human renal proximal tubular epithelial cells (HK‑2) were used to examine the protective effects of PPS against HG‑stimulated apoptosis and inflammation...
November 27, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29203863/orai-channels-are-critical-for-receptor-mediated-endocytosis-of-albumin
#20
Bo Zeng, Gui-Lan Chen, Eliana Garcia-Vaz, Sunil Bhandari, Nikoleta Daskoulidou, Lisa M Berglund, Hongni Jiang, Thomas Hallett, Lu-Ping Zhou, Li Huang, Zi-Hao Xu, Viji Nair, Robert G Nelson, Wenjun Ju, Matthias Kretzler, Stephen L Atkin, Maria F Gomez, Shang-Zhong Xu
Impaired albumin reabsorption by proximal tubular epithelial cells (PTECs) has been highlighted in diabetic nephropathy (DN), but little is known about the underlying molecular mechanisms. Here we find that ORAI1-3, are preferentially expressed in PTECs and downregulated in patients with DN. Hyperglycemia or blockade of insulin signaling reduces the expression of ORAI1-3. Inhibition of ORAI channels by BTP2 and diethylstilbestrol or silencing of ORAI expression impairs albumin uptake. Transgenic mice expressing a dominant-negative Orai1 mutant (E108Q) increases albuminuria, and in vivo injection of BTP2 exacerbates albuminuria in streptozotocin-induced and Akita diabetic mice...
December 4, 2017: Nature Communications
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