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https://www.readbyqxmd.com/read/29665669/-effects-of-intermittent-hypoxia-exposure-on-renal-tubular-epithelial-cell-injury-and-autophagy-in-rats
#1
C Wang, J Tan, B Y Chen, Q Zhang
Objective: To investigate the effects of intermittent hypoxia (IH) exposure on renal tubular epithelial cell injury and autophagy in rats. Methods: A total of 12 Sprague Dawley (SD) rats were randomly divided into two groups: normal control (NC) group and IH group, with 6 rats in each group. An IH animal model was established to observe the effects of IH on renal tubular epithelial cell damage and autophagy in rats. Microalbumin (mAlb) was detected by immunoturbidimetry. Neutrophil gelatinase-associated lipocalin (NGAL) and kidney injury molecule-1(KIM-1)in urine were assessed by enzyme-linked immunosorbent assay (ELISA) test...
March 27, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29653411/autophagy-inhibition-attenuates-hyperoxaluria-induced-renal-tubular-oxidative-injury-and-calcium-oxalate-crystal-depositions-in-the-rat-kidney
#2
Xiaolu Duan, Zhenzhen Kong, Xin Mai, Yu Lan, Yang Liu, Zhou Yang, Zhijian Zhao, Tuo Deng, Tao Zeng, Chao Cai, Shujue Li, Wen Zhong, Wenqi Wu, Guohua Zeng
Hyperoxaluria-induced oxidative injury of renal tubular epithelial cell is a casual and essential factor in kidney calcium oxalate (CaOx) stone formation. Autophagy has been shown to be critical for the regulation of oxidative stress-induced renal tubular injury; however, little is known about its role in kidney CaOx stone formation. In the present study, we found that the autophagy antagonist chloroquine could significantly attenuate oxalate-induced autophagy activation, oxidative injury and mitochondrial damage of renal tubular cells in vitro and in vivo, as well as hyperoxaluria-induced CaOx crystals depositions in rat kidney, whereas the autophagy agonist rapamycin exerted contrasting effects...
April 2, 2018: Redox Biology
https://www.readbyqxmd.com/read/29629491/regulation-of-autophagy-affects-the-prognosis-of-mice-with-severe-acute-pancreatitis
#3
Jianhua Wan, Jie Chen, Dangyan Wu, Xiaoyu Yang, Yaobin Ouyang, Yin Zhu, Liang Xia, Nonghua Lu
BACKGROUND: Acute pancreatitis (AP) is a common inflammatory disease that may develop to severe AP (SAP), resulting in life-threatening complications. Impaired autophagic flux is a characteristic of early AP, and its accumulation could activate oxidative stress and nuclear factor κB (NF-κB) pathways, which aggravate the disease process. AIM: To explore the therapeutic effects of regulating autophagy after the onset of AP. METHODS: In this study, intraperitoneal injections of 3-methyladenine (3-MA) and rapamycin (RAPA) in the L-arginine or cerulein plus lipopolysaccharide (LPS) Balb/C mouse model...
April 9, 2018: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29620262/dynamic-expression-and-roles-of-sequestome%C3%A2-1-p62-in-lps%C3%A2-induced-acute-kidney-injury-in-mice
#4
Ting Li, Jie Zhao, Shuying Miao, Yunfei Xu, Xianzhong Xiao, Ying Liu
Acute kidney injury (AKI) is one of the most common complications of sepsis. The roles of autophagy in AKI have been demonstrated in previous studies. Sequestosome‑1 (p62) has been demonstrated to serve essential roles in autophagy. The dysregulation of autophagy causes p62 accumulation, which is associated with increased inflammation and tumorigenesis. However, the expression patterns and role of p62 in septic AKI remain unknown. The present study detected the renal autophagy level, and the expression and localization of p62, in a lipopolysaccharide (LPS)‑induced AKI mouse model...
March 28, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29607326/ischemic-preconditioning-promotes-autophagy-and-alleviates-renal-ischemia-reperfusion-injury
#5
Ying Xie, Jing Xiao, Chensheng Fu, Zhenxing Zhang, Zhibin Ye, Xiaoli Zhang
Autophagy is important for cellular survival during renal ischemia/reperfusion (I/R) injury. Ischemic preconditioning (IPC) has a strong renoprotective effect during renal I/R. Our study here aimed to explore the effect of IPC on autophagy during renal I/R injury. Rats were subjected to unilateral renal ischemia with or without prior IPC. Hypoxia/reoxygenation (H/R) injury was induced in HK-2 cells with or without prior hypoxic preconditioning (HPC). Autophagy and apoptosis were detected after reperfusion or reoxygenation for different time...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29603122/postconditioning-effects-of-argon-or-xenon-on-early-graft-function-in-a-porcine-model-of-kidney-autotransplantation
#6
J De Deken, S Rex, E Lerut, W Martinet, D Monbaliu, J Pirenne, I Jochmans
BACKGROUND: Ischaemia-reperfusion injury is inevitable during renal transplantation and can lead to delayed graft function and primary non-function. Preconditioning, reconditioning and postconditioning with argon and xenon protects against renal ischaemia-reperfusion injury in rodent models. The hypothesis that postconditioning with argon or xenon inhalation would improve graft function in a porcine renal autotransplant model was tested. METHODS: Pigs (n = 6 per group) underwent left nephrectomy after 60 min of warm ischaemia (renal artery and vein clamping)...
March 30, 2018: British Journal of Surgery
https://www.readbyqxmd.com/read/29600538/sb-216763-a-gsk-3%C3%AE-inhibitor-protects-against-aldosterone-induced-cardiac-and-renal-injury-by-activating-autophagy
#7
Yi-De Zhang, Xiao-Jun Ding, Hou-Yong Dai, Wei-Sheng Peng, Nai-Feng Guo, Yuan Zhang, Qiao-Ling Zhou, Xiao-Lan Chen
Cardiovascular and renal inflammation induced by Aldosterone (Aldo) plays a pivotal role in the pathogenesis of hypertension and renal fibrosis. GSK-3β contributes to inflammatory cardiovascular and renal diseases, but its role in Aldo-induced hypertension, and renal damage is not clear. In the present study, rats were treated with Aldo combined with SB-216763 (a GSK-3β inhibitor) for 4 weeks. Hemodynamic, cardiac, and renal parameters were assayed at the indicated time. Here we found that rats treated with Aldo presented cardiac and renal hypertrophy and dysfunction...
March 30, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29575816/kidney-derived-c-kit-cells-possess-regenerative-potential
#8
Samirah A Gomes, Joshua M Hare, Erika B Rangel
Kidney-derived c-Kit+ cells exhibit progenitor/stem cell properties in vitro (self-renewal capacity, clonogenicity, and multipotentiality). These cells can regenerate epithelial tubular cells following ischemia-reperfusion injury and accelerate foot processes effacement reversal in a model of acute proteinuria in rats. Several mechanisms are involved in kidney regeneration by kidney-derived c-Kit+ cells, including cell engraftment and differentiation into renal-like structures, such as tubules, vessels, and podocytes...
April 2018: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/29556894/sodium-butyrate-induces-cell-death-by-autophagy-and-reactivates-a-tumor-suppressor-gene-diras1-in-renal-cell-carcinoma-cell-line-uok146
#9
Shiv Prakash Verma, Ayushi Agarwal, Parimal Das
Sodium butyrate (SB), a histone deacetylase inhibitor, is emerging as a potent anti-cancer drug for different types of cancers. In the present study, anti-cancer activity of SB in Xp11.2 (TFE3) translocated renal cell carcinoma cell line UOK146 was studied. Anti-proliferative effect of SB in renal cell carcinoma (RCC) cell line UOK146 was evaluated by MTT assay and morphological characteristics were observed by phase contrast microscopy which displayed the cell death after SB treatment. SB induces DNA fragmentation and change in nuclear morphology observed by increased sub-G1 region cell population and nuclear blebbings...
March 19, 2018: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/29556265/advanced-oxidation-protein-products-inhibit-the-autophagy-of-renal-tubular-epithelial-cells
#10
Jun Zhang, Xiaohong Xiang, Shuangshuang Shu, Cuiling Zhang, Yuling Liang, Tingting Jiang, Wenying Zhang, Tingting Guo, Xiujie Liang, Xun Tang
It is well known that autophagy serves a crucial role in renal tubular epithelial cell (RTEC) injury in the pathogenesis of chronic kidney disease (CKD). The accumulation of advanced oxidation protein products (AOPPs) also participates in the progression of CKD. However, the effects of AOPPs on autophagy remain unknown. To clarify the underlying mechanism of RTEC injury in CKD, the effect of AOPPs on HK-2 cells, an RTEC cell line, was investigated. The results of the present study revealed that AOPP exposure downregulated the expression of B-cell lymphoma-2-interacting myosin-like coiled-coil protein 1, reduced the conversion of microtubule-associated proteins 1 light chain 3B (LC3)-I to LC3-II and the formation of autophagosomes, and lead to an accumulation of p62...
April 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29534961/z-fl-cocho-a-cathepsin-s-inhibitor-enhances-oxaliplatin-induced-apoptosis-through-upregulation-of-bim-expression
#11
Seung Un Seo, Seon Min Woo, Kyoung-Jin Min, Taeg Kyu Kwon
Inhibition of cathespsin S not only inhibits invasion and angiogenesis, but also induces apoptosis and autophagy in cancer cells. In present study, we revealed that pharmacological inhibitor [Z-FL-COCHO (ZFL)] of cathepsin S up-regulates pro-apoptotic protein Bim expression at the posttranslational levels. These effects were not associated with MAPKs and AMPK signal pathways. Interestingly, pretreatment with the chemical chaperones (TUDCA and PBA) and knockdown of protein phosphatase 2A (PP2A) markedly inhibited ZFL-induced Bim upregulation...
April 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29511793/calcifying-nanoparticles-induce-cytotoxicity-mediated-by-ros-jnk-signaling-pathways
#12
Jihua Wu, Zhiwei Tao, Yaoliang Deng, Quan Liu, Yunlong Liu, Xiaofeng Guan, Xiang Wang
Calcifying nanoparticles (CNPs) play an important role in kidney stone formation, but the mechanism(s) are unclear. CNPs were isolated and cultured from midstream urine of patients with kidney stones. CNP morphology and characteristics were examined by electron microscopy and electrophoresis analysis. Chemical composition was analyzed using energy-dispersive X-ray microanalysis and Western blotting. Human renal proximal convoluted tubule cell (HK-2) cultures were exposed to CNPs for 0, 12 and 72 h, and production of reactive oxygen species (ROS), mitochondrial membrane potential and apoptosis levels were evaluated...
March 6, 2018: Urolithiasis
https://www.readbyqxmd.com/read/29507597/a-low-protein-diet-exerts-a-beneficial-effect-on-diabetic-status-and-prevents-diabetic-nephropathy-in-wistar-fatty-rats-an-animal-model-of-type-2-diabetes-and-obesity
#13
Munehiro Kitada, Yoshio Ogura, Taeko Suzuki, Itaru Monno, Keizo Kanasaki, Ai Watanabe, Daisuke Koya
Background: The objective of this study is to investigate the effects of a low-protein diet (LPD) starting from a young age on diabetic status and renal injury in a rat model of type 2 diabetes and obesity. Methods: Diabetic male Wistar fatty ( fa/fa ) rats (WFRs) were fed a standard diet (23.84% protein) or an LPD (5.77% protein) for 24 weeks beginning at 6 weeks of age. We investigated the effects of the LPD on total body weight (BW); fat weight (FW); lower-limb muscle weight (MW); several measures of diabetic status, including fasting/random glucose levels, HOMA-IR and the IPITT; and renal injuries, including renal hypertrophy, albuminuria and histological changes...
2018: Nutrition & Metabolism
https://www.readbyqxmd.com/read/29504645/methods-in-renal-research-measurement-of-autophagic-flux-in-the-renal-cortex-ex-vivo
#14
REVIEW
Gavin C Higgins, Tuong-Vi Nguyen, Georg Ramm, Melinda T Coughlan
The role of autophagy in the kidney and many nephrological diseases has gained prominence in recent years. Much of this research has been focused on markers of autophagy that are static and reveal little about the state of this dynamic pathway. Other mechanistic investigations are limited to in vitro studies, that often provide circumstantial evidence of autophagic flux. Here we describe a method for measuring autophagic flux ex vivo that allows more direct observations to be made in situ regarding the state of autophagic flux within the renal cortex of a single animal...
March 5, 2018: Nephrology
https://www.readbyqxmd.com/read/29501864/autophagy-is-a-major-mechanism-for-the-dual-effects-of-curcumin-on-renal-cell-carcinoma-cells
#15
Deng Qian, Liang Liang, Liu Quanhai, Duan Wanli, Jiang Yazhuo, Zhang Liandong
The aim of this study was to explore the effects of curcumin on renal cell carcinoma(RCC) through regulating autophagy. Cell viabilities were determined by MTT assay in RCC cells after treatment with curcumin at different concentrations for various durations. ATG7 silencing RCC cells were established to test the role of autophagy. The levels of key proteins on autophagy pathway were analyzed by Western blot. We found out that following 24h curcumin treatment, the viability of RCC cells had an increase at 5μM and no significant change at 20μM but a decrease at 80μM...
March 1, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29500224/tlr2-and-tlr4-play-opposite-role-in-autophagy-associated-with-cisplatin-induced-acute-kidney-injury
#16
Magaiver Andrade-Silva, Marcos Antônio Cenedeze, Luiz Augusto Perandini, Raphael José Ferreira Felizardo, Ingrid Mizuno Watanabe, Juan Sebastian Henao Agudelo, Ângela Castoldi, Giselle Martins Gonçalves, Clarice Silvia Taemi Origassa, Patricia Semedo, Meire Ioshie Hiyane, Orestes Foresto Neto, Denise Maria Avancini Costa Malheiros, Marlene Antonia Reis, Clarice Kazue Fujihara, Roberto Zatz, Alvaro Pacheco-Silva, Niels Olsen Saraiva Câmara, Danilo Candido de Almeida
Acute kidney injury (AKI) is considered an inflammatory disease in which Toll-like receptors (TLRs) signaling pathways play an important role. The activation of TLRs results in production of several inflammatory cytokines leading to further renal damage. In contrast, TLRs are key players on autophagy induction, which is associated with a protective function on cisplatin-induced AKI. Hence, this study aimed evaluate the specific participation of TLR2 and TLR4 molecules on development of cisplatin-induced AKI...
March 2, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29497318/klotho-ameliorates-sepsis-induced-acute-kidney-injury-but-is-irrelevant-to-autophagy
#17
Xinxin Chen, Huan Tong, Yu Chen, Chaosheng Chen, Jingjing Ye, Qingfei Mo, Guangju Zhao, Guangliang Hong, Chenfei Zheng, Zhongqiu Lu
Background: The role of Klotho (KL) in sepsis-induced acute kidney injury (AKI) and the potential relationship between KL and autophagy in septic AKI were investigated. Materials and methods: A murine model of sepsis-induced AKI was established by cecal ligation and puncture (CLP). Mice undergoing CLP and immortalized proximal tubular epithelial human HK-2 cells that were exposed to lipopolysaccharide (LPS) were treated with recombinant KL, autophagy stimulator rapamycin (Rap), and autophagy suppressor 3-methyladenine (3-MA)...
2018: OncoTargets and Therapy
https://www.readbyqxmd.com/read/29497029/ischemic-preconditioning-attenuates-ischemia-reperfusion-induced-kidney-injury-by-activating-autophagy-via-the-sgk1-signaling-pathway
#18
Ying Xie, Daofang Jiang, Jing Xiao, Chensheng Fu, Zhenxing Zhang, Zhibin Ye, Xiaoli Zhang
Ischemic preconditioning (IPC) has a strong renoprotective effect during renal ischemia/reperfusion (I/R) injury that is thought to relate to autophagy. However, the role of autophagy during IPC-afforded renoprotection and the precise mechanisms involved are unknown. In this study, an in vitro hypoxia/reoxygenation (H/R) model was established in which oxygen and glucose deprivation (OGD) was applied to renal cells for 15 h followed by reoxygenation under normal conditions for 30 min, 2 h or 6 h; transient OGD and subsequent reoxygenation were implemented before prolonged H/R injury to achieve hypoxic preconditioning (HPC)...
March 1, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29496446/notch1-regulates-pten-expression-to-exacerbate-renal-tubulointerstitial-fibrosis-in-diabetic-nephropathy-by-inhibiting-autophagy-via-interactions-with-hes1
#19
XingMei Liu, YingYing Zhang, MingJun Shi, YuanYuan Wang, Fan Zhang, Rui Yan, LingLing Liu, Ying Xiao, Bing Guo
Diabetic nephropathy (DN) is a serious clinical microvascular complication of diabetes mellitus. DN is characterized by the accumulation of extracellular matrix, resulting in progressive fibrosis leading to the loss of renal function. Notch1 and phosphatase and tensin homolog deleted on chromosome ten (PTEN) signaling have been associated with fibrosis. Autophagy serves as an essential regulator of tubular cellular homeostasis. However, how these molecules control the balance between fibrosis and autophagy, the main homeostatic mechanism regulating fibrosis, is not well understood...
February 26, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29494565/albumin-overload-and-pink1-parkin-signaling-related-mitophagy-in-renal-tubular-epithelial-cells
#20
Jin Tan, Qi Xie, Shuling Song, Yuyang Miao, Qiang Zhang
BACKGROUND Albumin, as a major urinary protein component, is a risk factor for chronic kidney disease progression. Mitochondrial dysfunction is one of the main causes of albumin-induced proximal tubule cells injury. Mitophagy is considered as a pivotal protective mechanism for the elimination of dysfunctional mitochondria. The objective of this research was to determine whether albumin overload-induced mitochondrial dysfunction can activate PINK1/Parkin-mediated mitophagy in renal tubular epithelial cells (TECs)...
March 1, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
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