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Nephrology

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Calcium oxalate crystals induce renal inflammation by NLRP3-mediated IL-1β secretion
Shrikant R. Mulay, … , Helen Liapis, Hans-Joachim Anders
Shrikant R. Mulay, … , Helen Liapis, Hans-Joachim Anders
Published December 10, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI63679.
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Calcium oxalate crystals induce renal inflammation by NLRP3-mediated IL-1β secretion

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Abstract

Nephrocalcinosis, acute calcium oxalate (CaOx) nephropathy, and renal stone disease can lead to inflammation and subsequent renal failure, but the underlying pathological mechanisms remain elusive. Other crystallopathies, such as gout, atherosclerosis, and asbestosis, trigger inflammation and tissue remodeling by inducing IL-1β secretion, leading us to hypothesize that CaOx crystals may induce inflammation in a similar manner. In mice, intrarenal CaOx deposition induced tubular damage, cytokine expression, neutrophil recruitment, and renal failure. We found that CaOx crystals activated murine renal DCs to secrete IL-1β through a pathway that included NLRP3, ASC, and caspase-1. Despite a similar amount of crystal deposits, intrarenal inflammation, tubular damage, and renal dysfunction were abrogated in mice deficient in MyD88; NLRP3, ASC, and caspase-1; IL-1R; or IL-18. Nephropathy was attenuated by DC depletion, ATP depletion, or therapeutic IL-1 antagonism. These data demonstrated that CaOx crystals trigger IL-1β–dependent innate immunity via the NLRP3/ASC/caspase-1 axis in intrarenal mononuclear phagocytes and directly damage tubular cells, leading to the release of the NLRP3 agonist ATP. Furthermore, these results suggest that IL-1β blockade may prevent renal damage in nephrocalcinosis.

Authors

Shrikant R. Mulay, Onkar P. Kulkarni, Khader V. Rupanagudi, Adriana Migliorini, Murthy N. Darisipudi, Akosua Vilaysane, Daniel Muruve, Yan Shi, Fay Munro, Helen Liapis, Hans-Joachim Anders

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CSF-1 signaling mediates recovery from acute kidney injury
Ming-Zhi Zhang, … , Amar Singh, Raymond C. Harris
Ming-Zhi Zhang, … , Amar Singh, Raymond C. Harris
Published November 12, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI60363.
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CSF-1 signaling mediates recovery from acute kidney injury

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Abstract

Renal tubule epithelia represent the primary site of damage in acute kidney injury (AKI), a process initiated and propagated by the infiltration of macrophages. Here we investigated the role of resident renal macrophages and dendritic cells in recovery from AKI after ischemia/reperfusion (I/R) injury or a novel diphtheria toxin–induced (DT-induced) model of selective proximal tubule injury in mice. DT-induced AKI was characterized by marked renal proximal tubular cell apoptosis. In both models, macrophage/dendritic cell depletion during the recovery phase increased functional and histologic injury and delayed regeneration. After I/R-induced AKI, there was an early increase in renal macrophages derived from circulating inflammatory (M1) monocytes, followed by accumulation of renal macrophages/dendritic cells with a wound-healing (M2) phenotype. In contrast, DT-induced AKI only generated an increase in M2 cells. In both models, increases in M2 cells resulted largely from in situ proliferation in the kidney. Genetic or pharmacologic inhibition of macrophage colony-stimulating factor (CSF-1) signaling blocked macrophage/dendritic cell proliferation, decreased M2 polarization, and inhibited recovery. These findings demonstrated that CSF-1–mediated expansion and polarization of resident renal macrophages/dendritic cells is an important mechanism mediating renal tubule epithelial regeneration after AKI.

Authors

Ming-Zhi Zhang, Bing Yao, Shilin Yang, Li Jiang, Suwan Wang, Xiaofeng Fan, Huiyong Yin, Karlton Wong, Tomoki Miyazawa, Jianchun Chen, Ingrid Chang, Amar Singh, Raymond C. Harris

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Gain of glycosylation in integrin α3 causes lung disease and nephrotic syndrome
Nayia Nicolaou, … , Kirsten Y. Renkema, Arnoud Sonnenberg
Nayia Nicolaou, … , Kirsten Y. Renkema, Arnoud Sonnenberg
Published November 1, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI64100.
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Gain of glycosylation in integrin α3 causes lung disease and nephrotic syndrome

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Abstract

Integrins are transmembrane αβ glycoproteins that connect the extracellular matrix to the cytoskeleton. The laminin-binding integrin α3β1 is expressed at high levels in lung epithelium and in kidney podocytes. In podocytes, α3β1 associates with the tetraspanin CD151 to maintain a functional filtration barrier. Here, we report on a patient homozygous for a novel missense mutation in the human ITGA3 gene, causing fatal interstitial lung disease and congenital nephrotic syndrome. The mutation caused an alanine-to-serine substitution in the integrin α3 subunit, thereby introducing an N-glycosylation motif at amino acid position 349. We expressed this mutant form of ITGA3 in murine podocytes and found that hyperglycosylation of the α3 precursor prevented its heterodimerization with β1, whereas CD151 association with the α3 subunit occurred normally. Consequently, the β1 precursor accumulated in the ER, and the mutant α3 precursor was degraded by the ubiquitin-proteasome system. Thus, these findings uncover a gain-of-glycosylation mutation in ITGA3 that prevents the biosynthesis of functional α3β1, causing a fatal multiorgan disorder.

Authors

Nayia Nicolaou, Coert Margadant, Sietske H. Kevelam, Marc R. Lilien, Michiel J.S. Oosterveld, Maaike Kreft, Albertien M. van Eerde, Rolph Pfundt, Paulien A. Terhal, Bert van der Zwaag, Peter G.J. Nikkels, Norman Sachs, Roel Goldschmeding, Nine V.A.M. Knoers, Kirsten Y. Renkema, Arnoud Sonnenberg

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PTH-independent regulation of blood calcium concentration by the calcium-sensing receptor
Alexandre Loupy, … , Martial Ruat, Pascal Houillier
Alexandre Loupy, … , Martial Ruat, Pascal Houillier
Published August 13, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI57407.
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PTH-independent regulation of blood calcium concentration by the calcium-sensing receptor

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Abstract

Tight regulation of calcium levels is required for many critical biological functions. The Ca2+-sensing receptor (CaSR) expressed by parathyroid cells controls blood calcium concentration by regulating parathyroid hormone (PTH) secretion. However, CaSR is also expressed in other organs, such as the kidney, but the importance of extraparathyroid CaSR in calcium metabolism remains unknown. Here, we investigated the role of extraparathyroid CaSR using thyroparathyroidectomized, PTH-supplemented rats. Chronic inhibition of CaSR selectively increased renal tubular calcium absorption and blood calcium concentration independent of PTH secretion change and without altering intestinal calcium absorption. CaSR inhibition increased blood calcium concentration in animals pretreated with a bisphosphonate, indicating that the increase did not result from release of bone calcium. Kidney CaSR was expressed primarily in the thick ascending limb of the loop of Henle (TAL). As measured by in vitro microperfusion of cortical TAL, CaSR inhibitors increased calcium reabsorption and paracellular pathway permeability but did not change NaCl reabsorption. We conclude that CaSR is a direct determinant of blood calcium concentration, independent of PTH, and modulates renal tubular calcium transport in the TAL via the permeability of the paracellular pathway. These findings suggest that CaSR inhibitors may provide a new specific treatment for disorders related to impaired PTH secretion, such as primary hypoparathyroidism.

Authors

Alexandre Loupy, Suresh Krishna Ramakrishnan, Bharath Wootla, Régine Chambrey, Renaud de la Faille, Soline Bourgeois, Patrick Bruneval, Chantal Mandet, Erik Ilso Christensen, Hélène Faure, Lydie Cheval, Kamel Laghmani, Corinne Collet, Dominique Eladari, Robert H. Dodd, Martial Ruat, Pascal Houillier

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Crk1/2-dependent signaling is necessary for podocyte foot process spreading in mouse models of glomerular disease
Britta George, … , Maria Pia Rastaldi, Lawrence B. Holzman
Britta George, … , Maria Pia Rastaldi, Lawrence B. Holzman
Published January 17, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI60070.
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Crk1/2-dependent signaling is necessary for podocyte foot process spreading in mouse models of glomerular disease

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Abstract

The morphology of healthy podocyte foot processes is necessary for maintaining the characteristics of the kidney filtration barrier. In most forms of glomerular disease, abnormal filter barrier function results when podocytes undergo foot process spreading and retraction by remodeling their cytoskeletal architecture and intercellular junctions during a process known as effacement. The cell adhesion protein nephrin is necessary for establishing the morphology of the kidney podocyte in development by transducing from the specialized podocyte intercellular junction phosphorylation-mediated signals that regulate cytoskeletal dynamics. The present studies extend our understanding of nephrin function by showing that nephrin activation in cultured podocytes induced actin dynamics necessary for lamellipodial protrusion. This process required a PI3K-, Cas-, and Crk1/2-dependent signaling mechanism distinct from the previously described nephrin-Nck1/2 pathway necessary for assembly and polymerization of actin filaments. Our present findings also support the hypothesis that mechanisms governing lamellipodial protrusion in culture are similar to those used in vivo during foot process effacement in a subset of glomerular diseases. In mice, podocyte-specific deletion of Crk1/2 prevented foot process effacement in one model of podocyte injury and attenuated foot process effacement and associated proteinuria in a delayed fashion in a second model. In humans, focal adhesion kinase and Cas phosphorylation — markers of focal adhesion complex–mediated Crk-dependent signaling — was induced in minimal change disease and membranous nephropathy, but not focal segmental glomerulosclerosis. Together, these observations suggest that activation of a Cas-Crk1/2–dependent complex is necessary for foot process effacement observed in distinct subsets of human glomerular diseases.

Authors

Britta George, Rakesh Verma, Abdulsalam A. Soofi, Puneet Garg, Jidong Zhang, Tae-Ju Park, Laura Giardino, Larisa Ryzhova, Duncan B. Johnstone, Hetty Wong, Deepak Nihalani, David J. Salant, Steven K. Hanks, Tom Curran, Maria Pia Rastaldi, Lawrence B. Holzman

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The CXCR4/CXCR7/SDF-1 pathway contributes to the pathogenesis of Shiga toxin–associated hemolytic uremic syndrome in humans and mice
Tania N. Petruzziello-Pellegrini, … , James L. Brunton, Philip A. Marsden
Tania N. Petruzziello-Pellegrini, … , James L. Brunton, Philip A. Marsden
Published January 9, 2012
Citation Information: J Clin Invest. 2012. https://doi.org/10.1172/JCI57313.
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The CXCR4/CXCR7/SDF-1 pathway contributes to the pathogenesis of Shiga toxin–associated hemolytic uremic syndrome in humans and mice

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Abstract

Hemolytic uremic syndrome (HUS) is a potentially life-threatening condition. It often occurs after gastrointestinal infection with E. coli O157:H7, which produces Shiga toxins (Stx) that cause hemolytic anemia, thrombocytopenia, and renal injury. Stx-mediated changes in endothelial phenotype have been linked to the pathogenesis of HUS. Here we report our studies investigating Stx-induced changes in gene expression and their contribution to the pathogenesis of HUS. Stx function by inactivating host ribosomes but can also alter gene expression at concentrations that minimally affect global protein synthesis. Gene expression profiling of human microvascular endothelium treated with Stx implicated a role for activation of CXCR4 and CXCR7 by their shared cognate chemokine ligand (stromal cell–derived factor-1 [SDF-1]) in Stx-mediated pathophysiology. The changes in gene expression required a catalytically active Stx A subunit and were mediated by enhanced transcription and mRNA stability. Stx also enhanced the association of CXCR4, CXCR7, and SDF1 mRNAs with ribosomes. In a mouse model of Stx-mediated pathology, we noted changes in plasma and tissue content of CXCR4, CXCR7, and SDF-1 after Stx exposure. Furthermore, inhibition of the CXCR4/SDF-1 interaction decreased endothelial activation and organ injury and improved animal survival. Finally, in children infected with E. coli O157:H7, plasma SDF-1 levels were elevated in individuals who progressed to HUS. Collectively, these data implicate the CXCR4/CXCR7/SDF-1 pathway in Stx-mediated pathogenesis and suggest novel therapeutic strategies for prevention and/or treatment of complications associated with E. coli O157:H7 infection.

Authors

Tania N. Petruzziello-Pellegrini, Darren A. Yuen, Andrea V. Page, Sajedabanu Patel, Anna M. Soltyk, Charles C. Matouk, Dennis K. Wong, Paul J. Turgeon, Jason E. Fish, J.J. David Ho, Brent M. Steer, Vahid Khajoee, Jayesh Tigdi, Warren L. Lee, David G. Motto, Andrew Advani, Richard E. Gilbert, S. Ananth Karumanchi, Lisa A. Robinson, Phillip I. Tarr, W. Conrad Liles, James L. Brunton, Philip A. Marsden

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FGF23 induces left ventricular hypertrophy
Christian Faul, … , Martin G. Keane, Myles Wolf
Christian Faul, … , Martin G. Keane, Myles Wolf
Published October 10, 2011
Citation Information: J Clin Invest. 2011. https://doi.org/10.1172/JCI46122.
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FGF23 induces left ventricular hypertrophy

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Abstract

Chronic kidney disease (CKD) is a public health epidemic that increases risk of death due to cardiovascular disease. Left ventricular hypertrophy (LVH) is an important mechanism of cardiovascular disease in individuals with CKD. Elevated levels of FGF23 have been linked to greater risks of LVH and mortality in patients with CKD, but whether these risks represent causal effects of FGF23 is unknown. Here, we report that elevated FGF23 levels are independently associated with LVH in a large, racially diverse CKD cohort. FGF23 caused pathological hypertrophy of isolated rat cardiomyocytes via FGF receptor–dependent activation of the calcineurin-NFAT signaling pathway, but this effect was independent of klotho, the coreceptor for FGF23 in the kidney and parathyroid glands. Intramyocardial or intravenous injection of FGF23 in wild-type mice resulted in LVH, and klotho-deficient mice demonstrated elevated FGF23 levels and LVH. In an established animal model of CKD, treatment with an FGF–receptor blocker attenuated LVH, although no change in blood pressure was observed. These results unveil a klotho-independent, causal role for FGF23 in the pathogenesis of LVH and suggest that chronically elevated FGF23 levels contribute directly to high rates of LVH and mortality in individuals with CKD.

Authors

Christian Faul, Ansel P. Amaral, Behzad Oskouei, Ming-Chang Hu, Alexis Sloan, Tamara Isakova, Orlando M. Gutiérrez, Robier Aguillon-Prada, Joy Lincoln, Joshua M. Hare, Peter Mundel, Azorides Morales, Julia Scialla, Michael Fischer, Elsayed Z. Soliman, Jing Chen, Alan S. Go, Sylvia E. Rosas, Lisa Nessel, Raymond R. Townsend, Harold I. Feldman, Martin St. John Sutton, Akinlolu Ojo, Crystal Gadegbeku, Giovana Seno Di Marco, Stefan Reuter, Dominik Kentrup, Klaus Tiemann, Marcus Brand, Joseph A. Hill, Orson W. Moe, Makoto Kuro-o, John W. Kusek, Martin G. Keane, Myles Wolf

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Arhgap24 inactivates Rac1 in mouse podocytes, and a mutant form is associated with familial focal segmental glomerulosclerosis
Shreeram Akilesh, … , Michelle P. Winn, Andrey S. Shaw
Shreeram Akilesh, … , Michelle P. Winn, Andrey S. Shaw
Published September 12, 2011
Citation Information: J Clin Invest. 2011. https://doi.org/10.1172/JCI46458.
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Arhgap24 inactivates Rac1 in mouse podocytes, and a mutant form is associated with familial focal segmental glomerulosclerosis

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Abstract

The specialized epithelial cell of the kidney, the podocyte, has a complex actin-based cytoskeleton. Dynamic regulation of this cytoskeleton is required for efficient barrier function of the kidney. Podocytes are a useful cell type to study the control of the actin cytoskeleton in vivo, because disruption of components of the cytoskeleton results in podocyte damage, cell loss, and a prototypic injury response called focal segmental glomerulosclerosis (FSGS). Searching for actin regulatory proteins that are expressed in podocytes, we identified a RhoA-activated Rac1 GTPase-activating protein (Rac1-GAP), Arhgap24, that was upregulated in podocytes as they differentiated, both in vitro and in vivo. Increased levels of active Rac1 and Cdc42 were measured in Arhgap24 knockdown experiments, which influenced podocyte cell shape and membrane dynamics. Consistent with a role for Arhgap24 in normal podocyte functioning in vivo, sequencing of the ARHGAP24 gene in patients with FSGS identified a mutation that impaired its Rac1-GAP activity and was associated with disease in a family with FSGS. Thus, Arhgap24 contributes to the careful balancing of RhoA and Rac1 signaling in podocytes, the disruption of which may lead to kidney disease.

Authors

Shreeram Akilesh, Hani Suleiman, Haiyang Yu, M. Christine Stander, Peter Lavin, Rasheed Gbadegesin, Corinne Antignac, Martin Pollak, Jeffrey B. Kopp, Michelle P. Winn, Andrey S. Shaw

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Dysfunction of fibroblasts of extrarenal origin underlies renal fibrosis and renal anemia in mice
Nariaki Asada, … , Masayuki Yamamoto, Motoko Yanagita
Nariaki Asada, … , Masayuki Yamamoto, Motoko Yanagita
Published September 12, 2011
Citation Information: J Clin Invest. 2011. https://doi.org/10.1172/JCI57301.
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Dysfunction of fibroblasts of extrarenal origin underlies renal fibrosis and renal anemia in mice

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Abstract

In chronic kidney disease, fibroblast dysfunction causes renal fibrosis and renal anemia. Renal fibrosis is mediated by the accumulation of myofibroblasts, whereas renal anemia is mediated by the reduced production of fibroblast-derived erythropoietin, a hormone that stimulates erythropoiesis. Despite their importance in chronic kidney disease, the origin and regulatory mechanism of fibroblasts remain unclear. Here, we have demonstrated that the majority of erythropoietin-producing fibroblasts in the healthy kidney originate from myelin protein zero–Cre (P0-Cre) lineage-labeled extrarenal cells, which enter the embryonic kidney at E13.5. In the diseased kidney, P0-Cre lineage-labeled fibroblasts, but not fibroblasts derived from injured tubular epithelial cells through epithelial-mesenchymal transition, transdifferentiated into myofibroblasts and predominantly contributed to fibrosis, with concomitant loss of erythropoietin production. We further demonstrated that attenuated erythropoietin production in transdifferentiated myofibroblasts was restored by the administration of neuroprotective agents, such as dexamethasone and neurotrophins. Moreover, the in vivo administration of tamoxifen, a selective estrogen receptor modulator, restored attenuated erythropoietin production as well as fibrosis in a mouse model of kidney fibrosis. These findings reveal the pathophysiological roles of P0-Cre lineage-labeled fibroblasts in the kidney and clarify the link between renal fibrosis and renal anemia.

Authors

Nariaki Asada, Masayuki Takase, Jin Nakamura, Akiko Oguchi, Misako Asada, Norio Suzuki, Ken-ichi Yamamura, Narihito Nagoshi, Shinsuke Shibata, Tata Nageswara Rao, Hans Joerg Fehling, Atsushi Fukatsu, Naoko Minegishi, Toru Kita, Takeshi Kimura, Hideyuki Okano, Masayuki Yamamoto, Motoko Yanagita

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CD2AP in mouse and human podocytes controls a proteolytic program that regulates cytoskeletal structure and cellular survival
Suma Yaddanapudi, … , Sanja Sever, Jochen Reiser
Suma Yaddanapudi, … , Sanja Sever, Jochen Reiser
Published September 12, 2011
Citation Information: J Clin Invest. 2011. https://doi.org/10.1172/JCI58552.
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CD2AP in mouse and human podocytes controls a proteolytic program that regulates cytoskeletal structure and cellular survival

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Abstract

Kidney podocytes are highly differentiated epithelial cells that form interdigitating foot processes with bridging slit diaphragms (SDs) that regulate renal ultrafiltration. Podocyte injury results in proteinuric kidney disease, and genetic deletion of SD-associated CD2-associated protein (CD2AP) leads to progressive renal failure in mice and humans. Here, we have shown that CD2AP regulates the TGF-β1–dependent translocation of dendrin from the SD to the nucleus. Nuclear dendrin acted as a transcription factor to promote expression of cytosolic cathepsin L (CatL). CatL proteolyzed the regulatory GTPase dynamin and the actin-associated adapter synaptopodin, leading to a reorganization of the podocyte microfilament system and consequent proteinuria. CD2AP itself was proteolyzed by CatL, promoting sustained expression of the protease during podocyte injury, and in turn increasing the apoptotic susceptibility of podocytes to TGF-β1. Our study identifies CD2AP as the gatekeeper of the podocyte TGF-β response through its regulation of CatL expression and defines a molecular mechanism underlying proteinuric kidney disease.

Authors

Suma Yaddanapudi, Mehmet M. Altintas, Andreas Kistler, Isabel Fernandez, Clemens C. Möller, Changli Wei, Vasil Peev, Jan B. Flesche, Anna-Lena Forst, Jing Li, Jaakko Patrakka, Zhijie Xiao, Florian Grahammer, Mario Schiffer, Tobias Lohmüller, Thomas Reinheckel, Changkyu Gu, Tobias B. Huber, Wenjun Ju, Markus Bitzer, Maria P. Rastaldi, Phillip Ruiz, Karl Tryggvason, Andrey Shaw, Christian Faul, Sanja Sever, Jochen Reiser

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Local TNF mediates free cholesterol–dependent podocyte injury
In this episode, Alessia Fornoni reveals that TNF promotes free cholesterol–dependent podocyte apoptosis via an NFATc1/ ABCA1-dependent mechanism.
Published August 2, 2016
Video AbstractsNephrology

Anti-THSD7A is a bona fide culprit in membranous nephropathy
Nicola M. Tomas, Elion Hoxha, and colleagues provide evidence that anti-THSD7A antibodies promote the development of membranous nephropathy...
Published May 23, 2016
Scientific Show StopperNephrology

Identifying sporadic focal segmental glomerulosclerosis-associated genes
Haiyang Yu, Mykyta Artomov, Sebastian Brähler and colleagues demonstrate the genetic contribution to the development of focal segmental glomerulosclerosis...
Published February 22, 2016
Scientific Show StopperNephrology

DNA replication stress linked to ciliopathies
Gisela Slaats and colleagues reveal that ciliopathy syndrome-associated mutations in CEP290 result in replication errors and DNA damage…
Published August 24, 2015
Scientific Show StopperNephrology

Nephrotic syndrome-associated mutations
Heon Yung Gee, Fujian Zhang, and colleagues reveal that mutations in KANK family genes underlie podocyte dysfunction and are associated with nephrotic syndrome…
Published May 11, 2015
Scientific Show StopperNephrology

Podocyte macropinocytosis
Jun-Jae Chung, Tobias B. Huber, Markus Gödel, and colleagues show that albumin-bound free fatty acids increase fluid-phase uptake in podocytes…
Published April 27, 2015
Scientific Show StopperNephrology

A network of diuretic resistance
Richard Grimm and colleagues use a systems biology approach to uncover mechanisms of renal compensation that lead to diuretic resistance…
Published April 20, 2015
Scientific Show StopperNephrology

KIM-1 protects the kidney after injury
Li Yang, Craig Brooks, and colleagues at Harvard Medical School demonstrate that KIM-1-mediated phagocytosis of apoptotic cells dampens inflammatory responses after kidney injury.. .
Published March 9, 2015
Scientific Show StopperNephrology

Protection against acute kidney injury
Marina Morigi and colleagues demonstrate that sirtuin 3 expression improves survival in a murine model of acute kidney injury...
Published January 20, 2015
Scientific Show StopperNephrology

Helping polycysin-1 reach the surface
Vladimir Gainullin and colleagues reveal that polycystin-2 is required for maturation and surface localization of polycystin-1…
Published January 9, 2015
Scientific Show StopperNephrology
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