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Glomerular endothelium

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https://www.readbyqxmd.com/read/29629958/guanylyl-cyclase-a-in-both-renal-proximal-tubular-and-vascular-endothelial-cells-protects-the-kidney-against-acute-injury-in-rodent-experimental-endotoxemia-models
#1
Hiroaki Kitamura, Daisuke Nakano, Yoshiharu Sawanobori, Takehiko Asaga, Hideki Yokoi, Motoko Yanagita, Masashi Mukoyama, Takeshi Tokudome, Kenji Kangawa, Gotaro Shirakami, Akira Nishiyama
BACKGROUND: Natriuretic peptides are used, based on empirical observations, in intensive care units as antioliguric treatments. We hypothesized that natriuretic peptides prevent lipopolysaccharide-induced oliguria by activating guanylyl cyclase A, a receptor for natriuretic peptides, in proximal tubules and endothelial cells. METHODS: Normal Sprague-Dawley rats and mice lacking guanylyl cyclase A in either endothelial cells or proximal tubular cells were challenged with lipopolysaccharide and assessed for oliguria and intratubular flow rate by intravital imaging with multiphoton microscopy...
April 9, 2018: Anesthesiology
https://www.readbyqxmd.com/read/29616045/complement-factor-h-inhibits-anti-neutrophil-cytoplasmic-autoantibody-induced-neutrophil-activation-by-interacting-with-neutrophils
#2
Su-Fang Chen, Feng-Mei Wang, Zhi-Ying Li, Feng Yu, Min Chen, Ming-Hui Zhao
Our previous study demonstrated that plasma levels of complement factor H (FH) were inversely associated with the disease activity of patients with anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis (AAV). In addition to serving as an inhibitor of the alternative complement pathway, there is increasing evidence demonstrating direct regulatory roles of FH on several cell types. Here, we investigated the role of FH in the process of ANCA-mediated activation of neutrophils and neutrophil-endothelium interaction...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29524578/impact-of-enos-27-bp-vntr-4b-a-gene-polymorphism-with-the-risk-of-systemic-lupus-erythematosus-in-south-indian-subjects
#3
Shiva Krishna Katkam, Bobbala Indumathi, Fatima S D Tasneem, Liza Rajasekhar, Vijay Kumar Kutala
OBJECTIVE: Endothelial nitric oxide synthase (eNOS) is constitutively expressed by vascular endothelium including glomerular endothelium. Functional polymorphisms, -786T>C (rs2070744) promoter variant, 27 bp VNTR (4b/a) in intron 4 and 894G>T (rs1799983) exon variant of eNOS are known to alter the eNOS expression and activity leading to altered NO levels and contribute to the development of vascular and renal disease risk. Thus it might have a role in SLE risk and development of glomerulonephritis...
March 7, 2018: Gene
https://www.readbyqxmd.com/read/29513069/glucose-dilates-renal-afferent-arterioles-via-glucose-transporter-1
#4
Jie Zhang, Shan Jiang, Jin Wei, Kay-Pong Yip, Lei Wang, En Yin Lai, Ruisheng Liu
Glomerular hyperfiltration often occurs during the early stage of diabetes. An acute glucose infusion increases glomerular filtration rate (GFR). The involvement of tubuloglomerular feedback response and direct effect of glucose on the afferent arterioles (Af-Arts) have been suggested. However, the signaling pathways to trigger Af-Art dilatation have not been fully identified. Therefore, in the present study we tested our hypothesis that an increase of glucose concentration enhances endothelial nitric oxide synthesis (NOS3) activity and dilates the Af-Arts via glucose transporter 1 (GLUT1) using isolated mouse Af-Arts with perfusion...
March 7, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29510679/case-report-lipid-inclusion-in-glomerular-endothelial-and-mesangial-cells-in-a-patient-after-contrast-medium-injection
#5
Hua Su, Chen Ye, Qian Wen, Hong-Yan Zhu, Li-Xia Yi, Chun Zhang
BACKGROUND: It is well-recognized that injection of iodinated radiographic contrast media (CM) sometimes causes acute renal injury via multiple mechanisms, such as vasoconstriction, toxicity on glomerular endothelium and tubular epithelium and so forth. CASE PRESENTATION: A 51-year-old man developed acute renal injury with proteinuria after CM administration. To our surprise, in his renal biopsy sample the myelin figure like structure was observed in glomerular endothelium and mesangial cells by transmission electron microscopy...
March 6, 2018: BMC Nephrology
https://www.readbyqxmd.com/read/29483572/overexpression-of-preeclampsia-induced-microrna-26a-5p-leads-to-proteinuria-in-zebrafish
#6
Janina Müller-Deile, Patricia Schröder, Lynne Beverly-Staggs, Rebecca Hiss, Jan Fiedler, Jenny Nyström, Thomas Thum, Hermann Haller, Mario Schiffer
So far the pathomechanism of preeclampsia in pregnancy is focussed on increased circulating levels of soluble fms-like tyrosin kinase-1 (sFLT-1) that neutralizes glomerular VEGF-A expression and prevents its signaling at the glomerular endothelium. As a result of changed glomerular VEGF-A levels endotheliosis and podocyte foot process effacement are typical morphological features of preeclampsia. Recently, microRNA-26a-5p (miR-26a-5p) was described to be also upregulated in the preeclamptic placenta. We found that miR-26a-5p targets VEGF-A expression by means of PIK3C2α in cultured human podocytes and that miR-26a-5p overexpression in zebrafish causes proteinuria, edema, glomerular endotheliosis and podocyte foot process effacement...
February 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29442209/capillary-rarefaction-and-altered-renal-development-the-imbalance-between-pro-and-anti-angiogenic-factors-in-response-to-angiotensin-ii-inhibition-in-the-developing-rat-kidney
#7
Kee Hwan Yoo, Hyung Eun Yim, Eun Soo Bae, Young Sook Hong
Proper and timely assembly of the kidney vasculature with their respective nephrons is crucial during normal kidney development. In this study, we investigated the effects of enalapril (angiotensin-converting enzyme inhibitor) on angiogenesis-related gene expression and microvascular endothelium related to glomeular and tubular changes in the neonatal rat kidney. Enalapril-treated rats had higher tubular injury scores and lower glomerular maturity grades than those of untreated rats. In the enalapril-treated group, intrarenal angiopoietin-2, Tie-2, and thrombospondin-1 protein expression increased, whereas intrarenal angiopoietin-1 protein expression decreased...
February 13, 2018: Journal of Molecular Histology
https://www.readbyqxmd.com/read/29432216/glomerulogenesis-and-the-role-of-endothelium
#8
Michio Nagata
PURPOSE OF REVIEW: Earlier works of the glomerulogenesis described morphological steps and protein expression during in-vivo and in-vitro kidney development. Recent technologies using cell-specific or conditional knock-out mice for several factors provide important knowledge about cross-talk signaling among resident cells as local events. Based on the recent advancement, this review revisits comprehensive morphological development of the glomerulus. RECENT FINDINGS: Interactions of presumptive podocyte vascular endothelial growth factor with vascular endothelial growth factor-2 on angioblasts initiate glomerular vascularization...
February 9, 2018: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/29397483/glomerular-endothelial-cell-maturation-depends-on-adam10-a-key-regulator-of-notch-signaling
#9
Gregory Farber, Romulo Hurtado, Sarah Loh, Sébastien Monette, James Mtui, Raphael Kopan, Susan Quaggin, Catherine Meyer-Schwesinger, Doris Herzlinger, Rizaldy P Scott, Carl P Blobel
The principal function of glomeruli is to filter blood through a highly specialized filtration barrier consisting of a fenestrated endothelium, the glomerular basement membrane and podocyte foot processes. Previous studies have uncovered a crucial role of endothelial a disintegrin and metalloprotease 10 (ADAM10) and Notch signaling in the development of glomeruli, yet the resulting defects have not been further characterized nor understood in the context of kidney development. Here, we used several different experimental approaches to analyze the kidneys and glomeruli from mice lacking ADAM10 in endothelial cells (A10ΔEC mice)...
February 3, 2018: Angiogenesis
https://www.readbyqxmd.com/read/29395335/the-atypical-chemokine-receptor-2-limits-renal-inflammation-and-fibrosis-in-murine-progressive-immune-complex-glomerulonephritis
#10
Andrei Bideak, Alexander Blaut, John M Hoppe, Martin B Müller, Giuseppina Federico, Nuru Eltrich, Hermann-Josef Gröne, Massimo Locati, Volker Vielhauer
The atypical chemokine receptor 2 (ACKR2), also named D6, regulates local levels of inflammatory chemokines by internalization and degradation. To explore potential anti-inflammatory functions of ACKR2 in glomerulonephritis, we induced autologous nephrotoxic nephritis in C57/BL6 wild-type and Ackr2-deficient mice. Renal ACKR2 expression increased and localized to interstitial lymphatic endothelium during nephritis. At two weeks Ackr2-/-mice developed increased albuminuria and urea levels compared to wild-type mice...
January 22, 2018: Kidney International
https://www.readbyqxmd.com/read/29353206/dihydroartemisinin-ameliorates-sepsis-induced-hyperpermeability-of-glomerular-endothelium-via-up-regulation-of-occludin-expression
#11
Zuowang Cheng, Ruixia Qi, Liqun Li, Qiang Liu, Wenqian Zhang, Xia Zhou, Dongmei Xu, Thaddeus D Allen, Silin Pan, Ju Liu
Sepsis, the systemic inflammatory responses after infection, remains a serious cause of morbidity and mortality in critically ill patients. The anti-malarial agent dihydroartemisinin (DHA) has been shown to be anti-inflammatory. In this study, we examined the effects of DHA on sepsis-induced acute kidney injury (AKI) and explored the mechanism underlying its mode of action in AKI. In a lipopolysaccharide (LPS)-induced mouse model, we observed that DHA treatment ameliorated glomerular injury, and relieved elevation of the urine albumin to creatinine ratio (UACR) and serum creatinine...
March 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29330473/endothelial-heparan-sulfate-deficiency-reduces-inflammation-and-fibrosis-in-murine-diabetic-nephropathy
#12
Ditmer T Talsma, Kirankumar Katta, Marieke A B Ettema, Berna Kel, Marion Kusche-Gullberg, Moh R Daha, Coen A Stegeman, Jacob van den Born, Lianchun Wang
Inflammation plays a vital role in the development of diabetic nephropathy, but the underlying regulatory mechanisms are only partially understood. Our previous studies demonstrated that, during acute inflammation, endothelial heparan sulfate (HS) contributes to the adhesion and transendothelial migration of leukocytes into perivascular tissues by direct interaction with L-selectin and the presentation of bound chemokines. In the current study, we aimed to assess the role of endothelial HS on chronic renal inflammation and fibrosis in a diabetic nephropathy mouse model...
January 12, 2018: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/29262395/salvianolic-acid-a-protects-against-diabetic-nephropathy-through-ameliorating-glomerular-endothelial-dysfunction-via-inhibiting-age-rage-signaling
#13
Biyu Hou, Guifen Qiang, Yuerong Zhao, Xiuying Yang, Xi Chen, Yu Yan, Xiaobo Wang, Chenge Liu, Li Zhang, Guanhua Du
BACKGROUND/AIMS: Glomerular endothelium dysfunction leads to the progression of renal architectonic and functional abnormalities in early-stage diabetic nephropathy (DN). Advanced glycation end products (AGEs) and receptor for AGEs (RAGE) are proved to play important roles in diabetic nephropathy. This study investigated the role of Salvianolic acid A (SalA) on early-stage DN and its possible underlying mechanism. METHODS: In vitro AGEs formation and breaking rate were measured to illustrate the effect of SalA on AGEs...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29214442/shiga-toxin-triggers-endothelial-and-podocyte-injury-the-role-of-complement-activation
#14
REVIEW
Carlamaria Zoja, Simona Buelli, Marina Morigi
Shiga toxin (Stx)-producing Escherichia coli (STEC) is the offending agent in post-diarrhea-associated hemolytic uremic syndrome (HUS), a disorder characterized by thrombocytopenia, microangiopathic hemolytic anemia, and acute kidney failure, with thrombi occluding the renal microvasculature. Endothelial dysfunction has been recognized as the trigger event in the development of microangiopathic processes. Glomerular endothelial cells are susceptible to the toxic effects of Stxs that, via nuclear factor kappa B (NF-κB) activation, induce the expression of genes encoding for adhesion molecules and chemokines, culminating in leukocyte adhesion and platelet thrombus formation on the activated endothelium...
December 6, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29212810/heme-oxygenase-1-is-a-potent-inhibitor-of-placental-ischemia-mediated-endothelin-1-production-in-cultured-human-glomerular-endothelial-cells
#15
Bhavisha A Bakrania, Frank T Spradley, Simon C Satchell, David E Stec, John M Rimoldi, Rama S V Gadepalli, Joey P Granger
Preeclampsia is a pregnancy-specific disorder of maternal hypertension and reduced renal hemodynamics linked to reduced endothelial function. Placental ischemia is thought to be the culprit of this disease, as it causes the release of factors like tumor necrosis factor (TNF)-α that induce vascular endothelin-1 (ET-1) production. Interestingly, placental ischemia-induced hypertension in rats (reduced uterine perfusion pressure, RUPP model) is abolished by ETA receptor blockade, suggesting a critical role for ET-1...
December 6, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29120962/endothelial-factors-in-the-pathogenesis-and-treatment-of-chronic-kidney-disease-part-i-general-mechanisms-a-joint-consensus-statement-from-the-european-society-of-hypertension-working-group-on-endothelin-and-endothelial-factors-and-the-japanese-society-of-hypertension
#16
Gian Paolo Rossi, Teresa M Seccia, Matthias Barton, A H Jan Danser, Peter W de Leeuw, Neeraj Dhaun, Damiano Rizzoni, Patrick Rossignol, Luis-Miguel Ruilope, Anton H van den Meiracker, Sadayoshi Ito, Naoyuki Hasebe, David J Webb
: Kidney damage is a common consequence of arterial hypertension, but is also a cause of atherogenesis. Dysfunction and/or harm of the endothelium in glomeruli and tubular interstitium damage the function of these structures and translates into dynamic changes of filtration fraction, with progressive reduction in glomerular filtration rate, expansion of extracellular fluid volume, abnormal ion balance, and hypoxia, ultimately leading to chronic kidney disease. Considering the key role played by endothelial dysfunction in chronic kidney disease, the Working Group on Endothelin and Endothelial Factors of the European Society of Hypertension and the Japanese Society of Hypertension have critically reviewed available knowledge on the mechanisms underlying endothelial cell injury...
November 7, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/29068360/soluble-cd40-ligand-and-oxidative-response-are-reciprocally-stimulated-during-shiga-toxin-associated-hemolytic-uremic-syndrome
#17
Maria J Abrey Recalde, Romina S Alvarez, Fabiana Alberto, Maria P Mejias, Maria V Ramos, Romina J Fernandez Brando, Andrea C Bruballa, Ramon A Exeni, Laura Alconcher, Cristina A Ibarra, María M Amaral, Marina S Palermo
Shiga toxin (Stx), produced by Escherichia coli , is the main pathogenic factor of diarrhea-associated hemolytic uremic syndrome (HUS), which is characterized by the obstruction of renal microvasculature by platelet-fibrin thrombi. It is well known that the oxidative imbalance generated by Stx induces platelet activation, contributing to thrombus formation. Moreover, activated platelets release soluble CD40 ligand (sCD40L), which in turn contributes to oxidative imbalance, triggering the release of reactive oxidative species (ROS) on various cellular types...
October 25, 2017: Toxins
https://www.readbyqxmd.com/read/29026082/targeted-delivery-of-celastrol-to-mesangial-cells-is-effective-against-mesangioproliferative-glomerulonephritis
#18
Ling Guo, Shi Luo, Zhengwu Du, Meiling Zhou, Peiwen Li, Yao Fu, Xun Sun, Yuan Huang, Zhirong Zhang
Mesangial cells-mediated glomerulonephritis is a frequent cause of end-stage renal disease. Here, we show that celastrol is effective in treating both reversible and irreversible mesangioproliferative glomerulonephritis in rat models, but find that its off-target distributions cause severe systemic toxicity. We thus target celastrol to mesangial cells using albumin nanoparticles. Celastrol-albumin nanoparticles crosses fenestrated endothelium and accumulates in mesangial cells, alleviating proteinuria, inflammation, glomerular hypercellularity, and excessive extracellular matrix deposition in rat anti-Thy1...
October 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29018490/the-promotion-of-nephropathy-by-porphyromonas-gingivalis-lipopolysaccharide-via-toll-like-receptors
#19
Koichiro Kajiwara, Shunsuke Takata, Thao T To, Kenyo Takara, Yuji Hatakeyama, Sachio Tamaoki, Richard Peters Darveau, Hiroyuki Ishikawa, Yoshihiko Sawa
BACKGROUND: Recently, we reported that toll-like receptor (TLR)2 and TLR4 localized on the glomerular endothelium in the glomeruli of streptozotocin (STZ)-induced type 1 diabetic mice and high fat diet feed-induced type 2 diabetic mice, and that periodontal pathogen Porphyromonas gingivalis LPS (Pg-LPS) administration lowered the survival rate of diabetic mice. The present study aims to examine the effect of TLR4 blocking on the suppression of Pg-LPS-induced diabetic nephropathy. METHODS: The survival rate and morphological/biochemical features for streptozotocin-induced diabetic mice with Pg-LPS and TLR4 blocker eritoran administration were investigated by reporter gene assay, urine and blood analysis, immunohistochemistry, and real time-PCR...
2017: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/28916834/ultrastructural-characterization-of-the-glomerulopathy-in-alport-mice-by-helium-ion-scanning-microscopy-him
#20
Kenji Tsuji, Hani Suleiman, Jeffrey H Miner, James M Daley, Diane E Capen, Teodor G Păunescu, Hua A Jenny Lu
The glomerulus exercises its filtration barrier function by establishing a complex filtration apparatus consisting of podocyte foot processes, glomerular basement membrane and endothelial cells. Disruption of any component of the glomerular filtration barrier leads to glomerular dysfunction, frequently manifested as proteinuria. Ultrastructural studies of the glomerulus by transmission electron microscopy (TEM) and conventional scanning electron microscopy (SEM) have been routinely used to identify and classify various glomerular diseases...
September 15, 2017: Scientific Reports
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