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TLR4 KIDNEY

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https://www.readbyqxmd.com/read/29156529/alpinetin-improved-high-fat-diet-induced-non-alcoholic-fatty-liver-disease-nafld-through-improving-oxidative-stress-inflammatory-response-and-lipid-metabolism
#1
Yong Zhou, Yin-Lu Ding, Jian-Liang Zhang, Peng Zhang, Jin-Qing Wang, Zhao-Hua Li
The non-alcoholic fatty liver disease (NAFLD) has become a serious medical problem and an increasing threat to public health. It is characterized by the abnormal fat accumulation in liver without excessive alcohol intake. The concurrent NAFLD might up-regulate the risk of chronic kidney disease as well as the mortality rate. Though various drugs have been investigated to attenuate NAFLD, further study is still necessary to find new therapeutic strategy and to reveal the underlying molecular mechanism. In the present study, NAFLD animal models were induced by feeding with high fat (HF) diet for 8 weeks...
November 15, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29094031/the-optimal-duration-of-ischemic-preconditioning-for-renal-ischemia-reperfusion-injury-in-mice
#2
Hyun Su Choi, Jeong Kye Hwang, Jeong Goo Kim, Hyeon Seok Hwang, Sang Ju Lee, Yoon Kyung Chang, Ji Il Kim, In Sung Moon
Purpose: The aim of the present study was to investigate the protective effects of ischemic preconditioning for different periods of time and to elucidate the optimal safe ischemic preconditioning time for renal ischemia-reperfusion (I/R) injury in mice. Methods: A total of 25 male C57BL/6 mice were randomly divided into 5 groups (sham, I/R, ischemic preconditioning [IP]-3, IP-5, and IP-7 groups), in which the kidney was preconditioned with IP of various durations and then subjected to I/R injury (the last 3 groups)...
October 2017: Annals of Surgical Treatment and Research
https://www.readbyqxmd.com/read/29069656/cyclosporine-a-induces-micrornas-controlling-innate-immunity-during-renal-bacterial-infection
#3
Malick Sadio, Emilie Tourneur, Marcelle Bens, Jean-Michel Goujon, Alain Vandewalle, Cécilia Chassin
Urinary tract infections (UTIs) mainly due to uropathogenic Escherichia coli (UPEC) are one of the most frequent complications in kidney-transplanted patients, causing significant morbidity. However, the mechanisms underlying UTI in renal grafts remain poorly understood. Here, we analysed the effects of the potent immunosuppressive agent cyclosporine A (CsA) on the activation of collecting duct cells that represent a preferential site of adhesion and translocation for UPEC. CsA induced the inhibition of lipopolysaccharide- induced activation of collecting duct cells due to the downregulation of the expression of TLR4 via the microRNA Let-7i...
October 26, 2017: Journal of Innate Immunity
https://www.readbyqxmd.com/read/29059081/the-role-of-toll-like-receptors-in-diabetic-kidney-disease
#4
Usha Panchapakesan, Carol Pollock
PURPOSE OF REVIEW: Involved in innate immunity, toll-like receptors (TLRs) recognize pathogenic and endogenous ligands. Ligand binding initiates an inflammatory cascade which if sustained leads to fibrosis. This review summarizes the role of TLRs in diabetic kidney disease (DKD) with particular emphasis on TLR2 and TLR4. RECENT FINDINGS: Collectively, preclinical evidence to date supports the causative role of TLR2 and TLR4 in both type I and type II DKD. The relative importance of each is still unclear...
October 20, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/29017152/high-uric-acid-induced-epithelial-mesenchymal-transition-of-renal-tubular-epithelial-cells-via-the-tlr4-nf-kb-signaling-pathway
#5
Huifang Liu, Jiachuan Xiong, Ting He, Tangli Xiao, Yan Li, Yanlin Yu, Yinghui Huang, Xinli Xu, Yunjian Huang, Jingbo Zhang, Bo Zhang, Jinghong Zhao
BACKGROUND: Hyperuricemia is an independent risk factor for causing chronic kidney disease and contributes to kidney fibrosis. After urate crystals get deposited in the kidney, they can cause hyperuricemia nephropathy, leading to glomerular hypertrophy and renal tubular interstitial fibrosis. Recent data showed that uric acid (UA) could induce epithelial mesenchymal transition (EMT) of renal tubular cells, in which NRLP3 inflammatory pathway was involved. However, whether TLR4/NF-κB signaling pathway is also involved in EMT of renal tubular cells induced by UA is not clear...
2017: American Journal of Nephrology
https://www.readbyqxmd.com/read/28994737/anti-inflammatory-pyranochalcone-derivative-attenuates-lps-induced-acute-kidney-injury-via-inhibiting-tlr4-nf-%C3%AE%C2%BAb-pathway
#6
Min Shi, Xiaoxi Zeng, Fan Guo, Rongshuang Huang, Yanhuan Feng, Liang Ma, Li Zhou, Ping Fu
Treatment of septic acute kidney injury (AKI) has still been beyond satisfaction, although anti-inflammatory therapy is beneficial for sepsis-induced AKI. Compound 5b was derived from natural pyranochalcones and exhibited potent anti-inflammatory activity in adjuvant-induced arthritis. In this study, we aimed to investigate the renoprotective effects and potential mechanism of 5b against lipopolysaccharide (LPS)-induced AKI. C57BL/6 mice and human renal proximal tubule cell line (HK-2 cell) were treated with LPS, respectively...
October 10, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28978536/the-role-of-tlr4-signaling-in-the-nephrotoxicity-of-heme-and-heme-proteins
#7
Karl A Nath, John D Belcher, Meryl C Nath, Joseph P Grande, Anthony J Croatt, Allan W Ackerman, Zvonimir S Katusic, Gregory M Vercellotti
Destabilized heme proteins release heme, and free heme is toxic. Heme is now recognized as an agonist for the TLR4 receptor. This study examined whether the TLR4 receptor mediates the nephrotoxicity of heme, specifically, the effects of heme on renal blood flow and inflammatory responses. We blocked TLR4 signaling by the specific antagonist TAK-242. Intravenous administration of heme to mice promptly reduced renal blood flow, an effect attenuated by TAK-242. In vitro, TAK-242 reduced heme-elicited activation of NF-κB and its downstream gene MCP-1; in contrast, TAK-242 failed to reduce heme-induced activation of the anti-inflammatory transcription factor, Nrf2, and its downstream gene HO-1...
October 4, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28977918/swine-irf3-irf7-attenuates-inflammatory-responses-through-tlr4-signaling-pathway
#8
Pei-Ge Chen, Yan-Jing Guan, Guang-Ming Zha, Xian-Qin Jiao, He-Shui Zhu, Cheng-Yu Zhang, Yue-Ying Wang, He-Ping Li
To explore the role of IRF3/IRF7 during inflammatory responses, we investigated the effects of swine IRF3/IRF7 on TLR4 signaling pathway and inflammatory factors expression in porcine kidney epithelial PK15 cell lines. We successfully constructed eukaryotic vectors PB-IRF3 and PB-IRF7, transfected these vectors into PK15 cells and observed GFP under a fluorescence microscope. In addition, RT-PCR was also used to detect transfection efficiency. We found that IRF3/IRF7 was efficiently overexpressed in PK15 cells...
September 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28971994/early-life-stress-induces-priming-of-the-immune-response-in-kidneys-of-adult-male-rats
#9
Carmen De Miguel, Ijeoma E Obi, Dao H Ho, Analia S Loria, Jennifer S Pollock
Early life stress (ELS) in humans is associated with elevated pro-inflammatory markers. We hypothesized that ELS induces activation of the immune response in a rat model of ELS, maternal separation (MatSep), in adulthood. MatSep involves separating pups from the dam from postnatal day 2 to postnatal day 14 for 3hrs/day. Control rats are non-separated littermates. We determined circulating and renal immune cell numbers, renal immune cell activation markers, renal cytokine levels, and the renal inflammatory gene expression response to low dose lipopolysaccharide (LPS) in male MatSep and control rats...
September 27, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28933050/toll-like-receptor-4-signaling-mediates-inflammation-and-tissue-injury-in-diabetic-nephropathy
#10
REVIEW
Giacomo Garibotto, Annalisa Carta, Daniela Picciotto, Francesca Viazzi, Daniela Verzola
Toll-like receptors (TLRs) are a class of receptors of the innate immune system which detect pathogen-associated and danger-associated molecular patterns in order to initiate an inflammatory response. TLR2 and TLR4 downward signaling causes the production of proinflammatory cytokines that can induce insulin resistance and cardiovascular damage in obesity and type 2 diabetes mellitus. In diabetic nephropathy, TLR4, nucleotide-binding oligomerization domain-containing protein 2 (NOD2), and NLRP3 inflammasome are involved in the production and persistence of inflammation...
September 20, 2017: Journal of Nephrology
https://www.readbyqxmd.com/read/28930914/the-protective-effect-of-a-short-peptide-derived-from-cold-inducible-rna-binding-protein-in-renal-ischemia-reperfusion-injury
#11
Joseph McGinn, Fangming Zhang, Monowar Aziz, Weng-Lang Yang, Jeffrey Nicastro, Gene F Coppa, Ping Wang
Extracellular cold-inducible RNA-binding protein (CIRP) functions as damage-associated molecular pattern (DAMP) and has been demonstrated to be responsible in part for the damage occurring after renal ischemia-reperfusion (I/R). A short peptide derived from CIRP, named C23, binds to myeloid differentiation factor 2 (MD2), a Toll-like receptor 4 (TLR4) co-receptor. We hypothesize that C23 reduces renal ischemia-reperfusion (RIR) injury by blocking CIRP. We observed that pre-treatment with C23 significantly decreased the levels of recombinant mouse CIRP-induced TNF-α in a dose-dependent fashion in cultured macrophages...
September 19, 2017: Shock
https://www.readbyqxmd.com/read/28898406/dc-sign-reacts-with-tlr4-and-regulates-inflammatory-cytokine-expression-via-nf-%C3%AE%C2%BAb-activation-in-renal-tubular-epithelial-cells-during-acute-renal-injury
#12
Danying Feng, Yanping Wang, Yan Liu, Liping Wu, Xiao Li, Yufan Chen, Yuanyuan Chen, Yafeng Chen, Chundi Xu, Ke Yang, Tong Zhou
In the pathological process of acute kidney injury (AKI), innate immune receptors are essential in inflammatory response modulation; however, the precise molecular mechanisms are still unclear. Our study sought to demonstrate the inflammatory response mechanisms in renal tubular epithelial cells via Toll-like receptor 4 (TLR4) and dendritic cell-specific ICAM-3-grabbing non-integrin 1 (DC-SIGN) signaling. We found that DC-SIGN exhibited strong expression in renal tubular epithelial cells of human acute renal injury tissues...
September 12, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28854431/involvement-of-s100a8-a9-tlr4-nlrp3-inflammasome-pathway-in-contrast-induced-acute-kidney-injury
#13
Xuexian Tan, Xiaohe Zheng, Zena Huang, Jiaqiong Lin, Chuli Xie, Yan Lin
BACKGROUND: Contrast-induced acute kidney injury (CIAKI) is a common cause of hospital-acquired acute kidney injury (AKI). S100A8/A9-TLR4-NLRP3 inflammasome pathway triggers inflammation, apoptosis and tissue injury in several AKI models. Nevertheless, the underlying mechanism of S100A8/A9-TLR4-NLRP3 inflammasome pathway in CIKAI is not clear. We aimed to investigate the possible role of S100A8/A9-TLR4-NLRP3 inflammasome in the pathophysiology of CIAKI. METHODS: We treated male rats and NRK-52E cells by iopromide to establish in vivo and in vitro models of CIAKI...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28836571/pharmacological-inhibition-of-macrophage-toll-like-receptor-4-nuclear-factor-kappa-b-alleviates-rhabdomyolysis-induced-acute-kidney-injury
#14
Rong-Shuang Huang, Jiao-Jiao Zhou, Yu-Ying Feng, Min Shi, Fan Guo, Shen-Ju Gou, Stephen Salerno, Liang Ma, Ping Fu
Background: Acute kidney injury (AKI) is the most common and life-threatening systemic complication of rhabdomyolysis. Inflammation plays an important role in the development of rhabdomyolysis-induced AKI. This study aimed to investigate the kidney model of AKI caused by rhabdomyolysis to verify the role of macrophage Toll-like receptor 4/nuclear factor-kappa B (TLR4/NF-κB) signaling pathway. Methods: C57BL/6 mice were injected with a 50% glycerin solution at bilateral back limbs to induce rhabdomyolysis, and CLI-095 or pyrrolidine dithiocarbamate (PDTC) was intraperitoneally injected at 0...
September 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28822965/diabetes-increases-the-susceptibility-to-acute-kidney-injury-after-myocardial-infarction-through-augmented-activation-of-renal-toll-like-receptors-in-rats
#15
Kouhei Ohno, Atsushi Kuno, Hiromichi Murase, Shingo Muratsubaki, Takayuki Miki, Masaya Tanno, Toshiyuki Yano, Satoko Ishikawa, Tomohisa Yamashita, Tetsuji Miura
Acute kidney injury (AKI) after acute myocardial infarction (MI) worsens the prognosis of MI patients. Although type 2 diabetes mellitus (DM) is a major risk factor of AKI after MI, the underlying mechanism remains unclear. Here, we examined roles of renal toll-like receptors (TLRs) in the impact of DM on AKI after MI. MI was induced by coronary artery ligation in OLETF, a rat DM model, and LETO, non-diabetic controls. Sham-operated rats served as no-MI controls. Renal mRNA levels of TLR2 and MyD88 were significantly higher in sham-operated OLETF than in sham-operated LETO, though levels of TLR1, TLR3, and TRL4 were similar...
August 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28817116/total-tanshinones-exhibits-anti-inflammatory-effects-through-blocking-tlr4-dimerization-via-the-myd88-pathway
#16
Hongwei Gao, Xin Liu, Wen Sun, Naixin Kang, Yanli Liu, Shilin Yang, Qiong-Ming Xu, Chunming Wang, Xiuping Chen
Tanshinones belong to a group of lipophilic constituents of Salvia miltiorrhiza Bunge (Danshen), which is widely used in traditional Chinese medicine. A deluge of studies demonstrated that tanshinones exert anti-inflammatory effects, but the underlying mechanisms remain unclear to date. This study investigated the anti-inflammatory effects and mechanisms of total tanshinones (TTN). TTN suppressed the expression of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) and the secretion of TNF-α, IL-6, and IL-1β in RAW264...
August 17, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28805489/atorvastatin-attenuates-experimental-contrast-induced-acute-kidney-injury-a-role-for-tlr4-myd88-signaling-pathway
#17
Rongzheng Yue, Chuan Zuo, Jing Zeng, Baihai Su, Ye Tao, Songmin Huang, Rui Zeng
OBJECTIVES: To investigate the protective effect of different atorvastatin doses on contrast-induced acute kidney injury and the related mechanism. METHODS: Healthy male Sprague-Dawley (SD) rats were randomly divided into the blank control group, experimental control group and different-dose atorvastatin groups. A rat model of contrast-induced acute kidney injury was established. We detected changes in serum creatinine (Scr) and blood urea nitrogen (BUN) before and after model establishment, observed and scored renal tubular injury, analyzed rat renal cell apoptosis, and measure the expression of signal pathway proteins and downstream inflammatory factors...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28764846/uric-acid-promotes-vascular-stiffness-maladaptive-inflammatory-responses-and-proteinuria-in-western-diet-fed-mice
#18
Annayya R Aroor, Guanghong Jia, Javad Habibi, Zhe Sun, Francisco I Ramirez-Perez, Barron Brady, Dongqing Chen, Luis A Martinez-Lemus, Camila Manrique, Ravi Nistala, Adam T Whaley-Connell, Vincent G Demarco, Gerald A Meininger, James R Sowers
OBJECTIVE: Aortic vascular stiffness has been implicated in the development of cardiovascular disease (CVD) and chronic kidney disease (CKD) in obese individuals. However, the mechanism promoting these adverse effects are unclear. In this context, promotion of obesity through consumption of a western diet (WD) high in fat and fructose leads to excess circulating uric acid. There is accumulating data implicating elevated uric acid in the promotion of CVD and CKD. Accordingly, we hypothesized that xanthine oxidase(XO) inhibition with allopurinol would prevent a rise in vascular stiffness and proteinuria in a translationally relevant model of WD-induced obesity...
September 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28743964/toll-like-receptor-4-deficiency-reduces-oxidative-stress-and-macrophage-mediated-inflammation-in-hypertensive-kidney
#19
Sathnur Pushpakumar, Lu Ren, Sourav Kundu, Alejandra Gamon, Suresh C Tyagi, Utpal Sen
Oxidative stress and inflammation are integral to hypertension-induced renal injury. A unifying feature for the two components is Toll-like receptors (TLR), which are key regulators of the innate immune system. Recent studies implicate TLR4 activation and oxidative stress in cardiovascular diseases and also as a link between inflammation and hypertension. However, its role in hypertension induced renal injury remains unexplored. In the present study, we investigated whether TLR-4 deficiency reduces Ang-II-induced renal injury and fibrosis by attenuating reactive oxygen species (ROS) production and inflammation...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28734896/porcine-cd14-gene-silencing-partially-inhibited-the-bacterial-immune-response-mediated-by-tlr4-signaling-pathway
#20
Chaohui Dai, Haifei Wang, Guoqiang Zhu, Shenglong Wu, Wenbin Bao
Cluster of differentiation antigen 14 (CD14) is the membrane receptor protein in Toll-like Receptor 4 (TLR4) signaling pathway, which plays an important regulation role in not only innate immune response but also adaptive immune response. In this study, the pig kidney epithelial cell (PK15) line with CD14 gene silencing mediated by lentivirus was established and cells of CD14-RNAi and NC group were exposed to three kinds of Escherichia coli (E. coli F18ab, E. coli F18ac and E. coli K88ac) and LPS. Then qPCR and western blot were used to detect expression levels of TLR4 signaling pathway-related genes...
September 10, 2017: Gene
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