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TLR4 KIDNEY

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https://www.readbyqxmd.com/read/29329595/human-umbilical-cord-mesenchymal-stem-cell-conditioned-medium-attenuates-renal-fibrosis-by-reducing-inflammation-and-epithelial-to-mesenchymal-transition-via-the-tlr4-nf-%C3%AE%C2%BAb-signaling-pathway-in-vivo-and-in-vitro
#1
Bo Liu, Fengxia Ding, Dong Hu, Yu Zhou, Chunlan Long, Lianju Shen, Yuanyuan Zhang, Deying Zhang, Guanghui Wei
BACKGROUND: Renal fibrosis is characterized by infiltration of interstitial inflammatory cells and release of inflammatory mediators, activation and proliferation of fibroblasts, and deposition of excessive extracellular matrix (ECM). The aim of this study was to evaluate the effect of human umbilical cord-derived mesenchymal stem cell (hucMSC) conditioned medium (CM) on renal tubulointerstitial inflammation and fibrosis. METHODS: Renal interstitial fibrosis was prepared in vivo using the unilateral ureteral obstruction (UUO)...
January 12, 2018: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29286200/relevance-of-megalin-receptor-injury-with-nuclear-factor-kappa-b-upregulation-in-acute-kidney-injury-induced-in-rats
#2
Shereen Saeid Elshaer, Hend Mohamed Anwar
Proximal tubule protein take-up is interceded by 2 receptors, megalin and cubilin. These receptors rescue an assortment of filtered ligands including fundamental vitamins and hormones. The objective of this study was to investigate the potential relation of megalin receptor injury with nuclear factor-kappa B (NF-κB) upregulation in acute kidney injury rat model. Twenty four rats were allocated into two groups: control group received saline, while the second group was intoxicated with cadmium chloride (2.4 mg Cd/kg/day i...
December 29, 2017: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/29261164/lipopolysaccharide-induced-acute-kidney-injury-is-dependent-on-an-il-18-receptor-signaling-pathway
#3
Yuji Nozaki, Shoichi Hino, Jinhai Ri, Kenji Sakai, Yasuaki Nagare, Mai Kawanishi, Kaoru Niki, Masanori Funauchi, Itaru Matsumura
The proinflammatory cytokine interleukin (IL)-18 is an important mediator of the organ failure induced by endotoxemia. IL-18 (known as an interferon-gamma (IFN-γ) inducing factor), and other inflammatory cytokines have important roles in lipopolysaccharide (LPS)-induced acute kidney injury (AKI). We investigated the effect of inflammatory cytokines and Toll-like receptor 4 (TLR4) expression, an event that is accompanied by an influx of monocytes, including CD4⁺ T cells and antigen-presenting cells (APCs) in IL-18Rα knockout (KO) mice and wild-type (WT) mice after LPS injection...
December 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29251774/altered-toll-like-receptor-responsiveness-underlies-a-dominant-heritable-defect-in-b-cell-tolerance-in-autoimmune-new-zealand-black-mice
#4
Amy G Clark, Elizabeth S Buckley, Mary H Foster
Systemic lupus erythematosus is a debilitating autoimmune disease in which autoantibodies and autoreactive T cells destroy kidneys and other organs. Disease is clinically and genetically heterogeneous, suggesting that underlying mechanisms vary between patients. We previously used an autoantibody transgenic mouse reporter system to examine the effect of different autoimmune backgrounds on B-cell tolerance, failure of which is a fundamental defect in lupus. We identified a defect consistent with reversible anergy induced by endotoxin stimulation of B cells from Ig transgenic New Zealand Black (NZB) mice...
December 18, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/29241180/high-mobility-group-box1-inhibitor-glycyrrhizic-acid-attenuates-kidney-injury-in-streptozotocin-induced-diabetic-rats
#5
Hong Zhang, Ru Zhang, Juan Chen, Min Shi, Wei Li, Xiangcheng Zhang
BACKGROUND/AIMS: High mobility group box 1 (HMGB1) is an important mediator of the inflammatory response. It has been implicated in the pathogenesis of autoimmune diseases, atherosclerosis, and obesity. However, the effects of HMGB1 on diabetic nephropathy remain unclear. Here, we investigated the potential roles and mechanisms of an HMGB1 inhibitor, glycyrrhizic acid (GA), in renal injury with the streptozotocin (STZ)-induced rat model. METHODS: The diabetic rat was generated by intraperitoneal injection of STZ and then treated with the HMGB1 inhibitor GA or saline for 8 weeks...
November 15, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29230705/crosstalk-between-tlr4-and-notch1-signaling-in-the-iga-nephropathy-during-inflammatory-response
#6
Xuxiang Sheng, Xiaoyan Zuo, Xihui Liu, Yang Zhou, Xia Sun
PURPOSE: IgA nephropathy (IgAN) is an immune complex-mediated disease involved in the kidney disease. Recent studies have revealed that Notch signaling-related genes are aberrantly expressed in various cell types and maybe associate with inflammation-induced carcinogenesis. The aim of our study was to investigate the function of Notch1 in the inflammatory response of IgAN. METHODS: The expression of Notch1, Jagged1 and NICD1 in 52 IgAN renal tissues and 20 control renal tissues was first determined using quantitative real-time PCR and Western blot...
December 11, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/29227975/high-phosphate-induced-calcification-of-vascular-smooth-muscle-cells-is-associated-with-the-tlr4-nf-%C3%AE%C2%BAb-signaling-pathway
#7
Daohai Zhang, Xianjin Bi, Yong Liu, Yinghui Huang, Jiachuan Xiong, Xinli Xu, Tangli Xiao, Yanlin Yu, Wei Jiang, Yunjian Huang, Jingbo Zhang, Bo Zhang, Jinghong Zhao
BACKGROUND/AIMS: Hyperphosphatemia is one of the most notable features of chronic kidney disease (CKD). Numerous epidemiological and clinical studies have found that high serum phosphate concentrations are associated with calcification in the coronary arteries. However, the mechanisms underlying the vascular calcification induced by high phosphate have not been understood fully. METHODS: Vascular smooth muscle cells (VSMCs) were cultured in high-phosphate media to induce vascular calcification, which was detected by Alizarin red S staining...
December 8, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29207360/oridonin-protects-against-the-inflammatory-response-in-diabetic-nephropathy-by-inhibiting-the-tlr4-p38-mapk-and-tlr4-nf-%C3%AE%C2%BAb-signaling-pathways
#8
Jushuang Li, Liping Bao, Dongqing Zha, Lian Zhang, Ping Gao, Juan Zhang, Xiaoyan Wu
Inflammation plays a pivotal role in the development and progression of diabetic nephropathy (DN). Oridonin (Ori), a component isolated from Rabdosia rubescens, possesses remarkable anti-inflammatory, immunoregulatory and antitumor properties. However, the renoprotective effects of Ori and the underlying molecular mechanisms have not been explored in DN. In this study, we aimed to investigate the protective effects and potential mechanisms responsible for the anti-inflammatory effects of Ori in diabetes-induced renal injury in vivo and in vitro...
December 2, 2017: International Immunopharmacology
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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