1
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Dixson AC, Dawson TR, Di Vizio D, Weaver AM. Context-specific regulation of extracellular vesicle biogenesis and cargo selection. Nat Rev Mol Cell Biol 2023; 24:454-476. [PMID: 36765164 PMCID: PMC10330318 DOI: 10.1038/s41580-023-00576-0] [Citation(s) in RCA: 122] [Impact Index Per Article: 122.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2023] [Indexed: 02/12/2023]
Abstract
To coordinate, adapt and respond to biological signals, cells convey specific messages to other cells. An important aspect of cell-cell communication involves secretion of molecules into the extracellular space. How these molecules are selected for secretion has been a fundamental question in the membrane trafficking field for decades. Recently, extracellular vesicles (EVs) have been recognized as key players in intercellular communication, carrying not only membrane proteins and lipids but also RNAs, cytosolic proteins and other signalling molecules to recipient cells. To communicate the right message, it is essential to sort cargoes into EVs in a regulated and context-specific manner. In recent years, a wealth of lipidomic, proteomic and RNA sequencing studies have revealed that EV cargo composition differs depending upon the donor cell type, metabolic cues and disease states. Analyses of distinct cargo 'fingerprints' have uncovered mechanistic linkages between the activation of specific molecular pathways and cargo sorting. In addition, cell biology studies are beginning to reveal novel biogenesis mechanisms regulated by cellular context. Here, we review context-specific mechanisms of EV biogenesis and cargo sorting, focusing on how cell signalling and cell state influence which cellular components are ultimately targeted to EVs.
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Affiliation(s)
- Andrew C Dixson
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - T Renee Dawson
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
- Center for Extracellular Vesicle Research, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Dolores Di Vizio
- Department of Surgery, Division of Cancer Biology and Therapeutics, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Alissa M Weaver
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA.
- Center for Extracellular Vesicle Research, Vanderbilt University School of Medicine, Nashville, TN, USA.
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.
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2
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Demais V, Pohl A, Wunderlich KA, Pfaller AM, Kaplan L, Barthélémy A, Dittrich R, Puig B, Giebel B, Hauck SM, Pfrieger FW, Grosche A. Release of VAMP5-positive extracellular vesicles by retinal Müller glia in vivo. J Extracell Vesicles 2022; 11:e12254. [PMID: 36043482 PMCID: PMC9428896 DOI: 10.1002/jev2.12254] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 06/25/2022] [Accepted: 07/18/2022] [Indexed: 11/11/2022] Open
Abstract
Cell-cell interactions in the central nervous system are based on the release of molecules mediating signal exchange and providing structural and trophic support through vesicular exocytosis and the formation of extracellular vesicles. The specific mechanisms employed by each cell type in the brain are incompletely understood. Here, we explored the means of communication used by Müller cells, a type of radial glial cells in the retina, which forms part of the central nervous system. Using immunohistochemical, electron microscopic, and molecular analyses, we provide evidence for the release of distinct extracellular vesicles from endfeet and microvilli of retinal Müller cells in adult mice in vivo. We identify VAMP5 as a Müller cell-specific SNARE component that is part of extracellular vesicles and responsive to ischemia, and we reveal differences between the secretomes of immunoaffinity-purified Müller cells and neurons in vitro. Our findings suggest extracellular vesicle-based communication as an important mediator of cellular interactions in the retina.
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Affiliation(s)
- Valerie Demais
- Plateforme Imagerie In Vitro, CNRS UAR 3156, Neuropôle, University of Strasbourg, Strasbourg, France
| | - Anne Pohl
- Department of Physiological Genomics, BioMedical Center BMC, Ludwig-Maximilian University, Planegg-Martinsried, Germany.,Institute of Human Genetics, University of Regensburg, Regensburg, Germany
| | - Kirsten A Wunderlich
- Department of Physiological Genomics, BioMedical Center BMC, Ludwig-Maximilian University, Planegg-Martinsried, Germany
| | - Anna M Pfaller
- Department of Physiological Genomics, BioMedical Center BMC, Ludwig-Maximilian University, Planegg-Martinsried, Germany
| | - Lew Kaplan
- Department of Physiological Genomics, BioMedical Center BMC, Ludwig-Maximilian University, Planegg-Martinsried, Germany
| | - Amelie Barthélémy
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France
| | - Robin Dittrich
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Berta Puig
- Neurology Department, Experimental Research in Stroke and Inflammation (ERSI), University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Bernd Giebel
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Stefanie M Hauck
- Metabolomics and Proteomics Core and Research Unit Protein Science, Helmholtz-Zentrum München, München, Germany
| | - Frank W Pfrieger
- Plateforme Imagerie In Vitro, CNRS UAR 3156, Neuropôle, University of Strasbourg, Strasbourg, France.,Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France
| | - Antje Grosche
- Department of Physiological Genomics, BioMedical Center BMC, Ludwig-Maximilian University, Planegg-Martinsried, Germany
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3
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Wang J, Wang X, Zhang X, Shao T, Luo Y, Wang W, Han Y. Extracellular Vesicles and Hepatocellular Carcinoma: Opportunities and Challenges. Front Oncol 2022; 12:884369. [PMID: 35692794 PMCID: PMC9175035 DOI: 10.3389/fonc.2022.884369] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 04/25/2022] [Indexed: 12/05/2022] Open
Abstract
The incidence of hepatocellular carcinoma (HCC) is increasing worldwide. Extracellular vesicles (EVs) contain sufficient bioactive substances and are carriers of intercellular information exchange, as well as delivery vehicles for nucleic acids, proteins and drugs. Although EVs show great potential for the treatment of HCC and their role in HCC progression has been extensively studied, there are still many challenges such as time-consuming extraction, difficult storage, easy contamination, and low drug loading rate. We focus on the biogenesis, morphological characteristics, isolation and extraction of EVs and their significance in the progression of HCC, tumor invasion, immune escape and cancer therapy for a review. EVs may be effective biomarkers for molecular diagnosis of HCC and new targets for tumor-targeted therapy.
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Affiliation(s)
- Juan Wang
- Department of Oncology, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Xiaoya Wang
- Clinical Medicine, Southwest Medical University, Luzhou, China
| | - Xintong Zhang
- Clinical Medicine, Southwest Medical University, Luzhou, China
| | - Tingting Shao
- Clinical Medicine, Southwest Medical University, Luzhou, China
| | - Yanmei Luo
- Clinical Medicine, Southwest Medical University, Luzhou, China
| | - Wei Wang
- Clinical Medicine, Southwest Medical University, Luzhou, China
| | - Yunwei Han
- Department of Oncology, The Affiliated Hospital of Southwest Medical University, Luzhou, China.,Department of Oncology, The Affiliated Hospital of Southwest Medical University, Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Academician (Expert) Workstation of Sichuan Province, Luzhou, China.,Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, China.,School of Basic Medical Sciences, Shandong University, Jinan, China
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4
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Fukuda A, Minakawa A, Sato Y, Shibata H, Hara M, Fujimoto S. Excretion Patterns of Urinary Sediment and Supernatant Podocyte Biomarkers in Patients with CKD. KIDNEY360 2021; 3:63-73. [PMID: 35368571 PMCID: PMC8967611 DOI: 10.34067/kid.0004772021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 11/02/2021] [Indexed: 01/10/2023]
Abstract
Background Podocyte depletion causes glomerulosclerosis, and persistent podocyte loss drives progression to ESKD. Urinary sediment podocin (u-sed Pod) mRNA excretion and urinary supernatant podocalyxin (u-sup PCX) protein have been used to monitor disease activity in glomerular diseases. However, the differences in these markers among pathologies have not been investigated. We examined the roles of these markers in kidney diseases. Methods From January 2013 to March 2016, early morning urine samples were collected from 12 healthy controls and 172 patients with kidney disease (n=15 patients with minor glomerular abnormality with mild proteinuria and/or microscopic hematuria, n=15 with minimal change nephrotic syndrome [MCNS], n=15 with membranous nephropathy [MN], n=60 with IgA nephropathy [IgAN], n=19 with crescentic GN [Cres GN], n=10 with lupus nephritis [LN], and n=38 with other kidney diseases). We examined u-sed Pod mRNA excretion, u-sup PCX protein, and the urinary protein-creatinine ratio (u-PCR). Results u-sed Pod mRNA excretion was significantly correlated with u-sup PCX protein (r=0.37, P<0.001). Both u-sed Pod mRNA excretion and u-sup PCX protein were significantly correlated with u-PCR (r=0.53, P<0.001 and r=0.35, P<0.001, respectively). Interestingly, u-sed Pod mRNA excretion was significantly increased in proliferative-type GN-including IgAN with extracapillary proliferative lesions, Cres GN, and LN class IV-and significantly correlated with the rate of crescent formation, whereas u-sup PCX protein was significantly increased only in those with MN and subepithelial dense deposit-type LN compared with controls. Conclusions Higher u-sed Pod mRNA excretion and u-sup PCX protein were associated with proliferative-type GN, indicating podocyte detachment and subepithelial dense deposit-type GN, respectively. The results suggest that u-sed Pod mRNA excretion and u-sup PCX protein have usefulness for the diagnosis and measurement of disease activity with regard to glomerular diseases.
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Affiliation(s)
- Akihiro Fukuda
- Department of Endocrinology, Metabolism, Rheumatology and Nephrology, Faculty of Medicine, Oita University, Yufu, Japan,Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Akihiro Minakawa
- Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Yuji Sato
- Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Hirotaka Shibata
- Department of Endocrinology, Metabolism, Rheumatology and Nephrology, Faculty of Medicine, Oita University, Yufu, Japan
| | | | - Shouichi Fujimoto
- Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
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5
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Ardalan M, Hosseiniyan Khatibi SM, Rahbar Saadat Y, Bastami M, Nariman-Saleh-Fam Z, Abediazar S, Khalilov R, Zununi Vahed S. Migrasomes and exosomes; different types of messaging vesicles in podocytes. Cell Biol Int 2021; 46:52-62. [PMID: 34647672 DOI: 10.1002/cbin.11711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 10/01/2021] [Accepted: 10/11/2021] [Indexed: 01/08/2023]
Abstract
Podocytes, highly specified kidney epithelial cells, live under several pathological stimuli and stresses during which they adapt themselves to keep homeostasis. Nevertheless, under extreme stress, a complex scenario of podocyte damage and its consequences occur. Podocyte damage causes foot process effacement and their detachment from the glomerular basement membrane, leading to proteinuria. Podocyte-derived extracellular vesicles (pEVs), mainly microparticles and exosomes are considered as signaling mediators of intercellular communication. Recently, it has been shown that throughout the injury-related migration procedure, podocytes are capable of releasing the injury-related migrasomes. Evidence indicates that at the early stages of glomerular disorders, increased levels of pEVs are observed in urine. At the early stage of nephropathy, pEVs especially migrasomes seem to be more sensitive and reliable indicators of podocyte stress and/or damage than proteinuria. This review highlights the current knowledge of pEVs and their values for the diagnosis of different kidney diseases.
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Affiliation(s)
| | | | | | - Milad Bastami
- Noncommunicable Diseases Research Center, Fasa University of Medical Sciences, Fasa, Iran
| | - Ziba Nariman-Saleh-Fam
- Women's Reproductive Health Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sima Abediazar
- Kidney Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rovshan Khalilov
- Department of Biophysics and Molecular Biology, Baku State University, Baku, Azerbaijan.,Joint Ukraine-Azerbaijan International Research and Education Center of Nanobiotechnology and Functional Nanosystems, Drohobych, Ukraine
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6
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Abstract
Morphological transitions are typically attributed to the actions of proteins and lipids. Largely overlooked in membrane shape regulation is the glycocalyx, a pericellular membrane coat that resides on all cells in the human body. Comprised of complex sugar polymers known as glycans as well as glycosylated lipids and proteins, the glycocalyx is ideally positioned to impart forces on the plasma membrane. Large, unstructured polysaccharides and glycoproteins in the glycocalyx can generate crowding pressures strong enough to induce membrane curvature. Stress may also originate from glycan chains that convey curvature preference on asymmetrically distributed lipids, which are exploited by binding factors and infectious agents to induce morphological changes. Through such forces, the glycocalyx can have profound effects on the biogenesis of functional cell surface structures as well as the secretion of extracellular vesicles. In this review, we discuss recent evidence and examples of these mechanisms in normal health and disease.
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Affiliation(s)
- Joe Chin-Hun Kuo
- Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, USA; ,
| | - Matthew J Paszek
- Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, USA; , .,Field of Biomedical Engineering and Field of Biophysics, Cornell University, Ithaca, New York 14853, USA.,Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
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7
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Rilla K. Diverse plasma membrane protrusions act as platforms for extracellular vesicle shedding. J Extracell Vesicles 2021; 10:e12148. [PMID: 34533887 PMCID: PMC8448080 DOI: 10.1002/jev2.12148] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 08/24/2021] [Accepted: 09/07/2021] [Indexed: 12/12/2022] Open
Abstract
Plasma membrane curvature is an important factor in the regulation of cellular phenotype and is critical for various cellular activities including the shedding of extracellular vesicles (EV). One of the most striking morphological features of cells is different plasma membrane-covered extensions supported by actin core such as filopodia and microvilli. Despite the various functions of these extensions are partially unexplained, they are known to facilitate many crucial cellular functions such as migration, adhesion, absorption, and secretion. Due to the rapid increase in the research activity of EVs, there is raising evidence that one of the general features of cellular plasma membrane protrusions is to act as specialized platforms for the budding of EVs. This review will focus on early observations and recent findings supporting this hypothesis, discuss the putative budding and shedding mechanisms of protrusion-derived EVs and their biological significance.
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Affiliation(s)
- Kirsi Rilla
- Institute of BiomedicineUniversity of Eastern FinlandKuopioFinland
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8
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Kim YH, Huh KH, Lim BJ, Kim BS, Kim YS, Kim SI, Kim MS, Lee J, Park JT, Yoo TH, Kang SW, Han SH, Jeong HJ. Glomerular subepithelial microparticles - a footprint for podocyte injury. Ultrastruct Pathol 2021; 45:236-242. [PMID: 34014800 DOI: 10.1080/01913123.2021.1929625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The aim of this study was to clarify the nature and clinical significance of glomerular subepithelial microparticles (SMPs), located between the basal surface of the podocytes and the glomerular basement membrane. Ultrastructural morphology of 79 renal biopsy samples (obtained from 25 native and 54 transplanted kidneys), showing SMPs in the last 3 years, was reevaluated with regard to the podocyte changes and clinical condition of the patients. One hundred and nine SMPs were identified, with 32.9% of the samples having two or more per glomerulus. Overall, they were most frequently located in the open capillary loops (55%). However, in the native kidney samples with mesangial deposits, 64.3% of SMPs were present in the mesangium-bound areas. Each vesicle ranged from 46.9 to 87.1 nm, and vesicles were admixed with curved strands in larger SMPs. Diffuse effacement of the foot processes and condensation of the actin filaments were present in 56.0% and 62.4% of the samples, respectively. SMPs were associated with hematuria, proteinuria of ≥ 1 gm, and immune complex deposition in the patients with native kidneys, whereas they were related to hyperglycemia and elevated serum creatinine levels in the patients with renal allografts. Patients with native and transplanted kidneys most commonly presented with IgA nephropathy and allograft rejection, respectively. Finding SMPs in the renal biopsy samples is not rare and they may act as a footprint of podocyte injury caused by diverse etiologies. Considering their size, podocyte exosomes could be a possible source of SMPs.
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Affiliation(s)
- Yon Hee Kim
- Department of Pathology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Kyu Ha Huh
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Beom Jin Lim
- Department of Pathology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Beom Seok Kim
- Division of Nephrology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Yu Seun Kim
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Soon Il Kim
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Myoung Soo Kim
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Juhan Lee
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jung Tak Park
- Division of Nephrology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Tae-Hyun Yoo
- Division of Nephrology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Shin-Wook Kang
- Division of Nephrology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Seung Hyeok Han
- Division of Nephrology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Hyeon Joo Jeong
- Department of Pathology, Yonsei University College of Medicine, Seoul, Republic of Korea
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9
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Takahashi N, Yoshida H, Kimura H, Kamiyama K, Kurose T, Sugimoto H, Imura T, Yokoi S, Mikami D, Kasuno K, Kurosawa H, Hirayama Y, Naiki H, Hara M, Iwano M. Chronic hypoxia exacerbates diabetic glomerulosclerosis through mesangiolysis and podocyte injury in db/db mice. Nephrol Dial Transplant 2020; 35:1678-1688. [PMID: 32596728 DOI: 10.1093/ndt/gfaa074] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Accepted: 03/14/2020] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Chronic hypoxia may play a pivotal role in the development of diabetic nephropathy (DN). However, the precise mechanisms underlying progressive hypoxia-induced glomerular injury remain unclear. METHODS We housed db/db mice in a hypoxia chamber (12% O2) for up to 16 weeks beginning at 8 weeks of age. Various urine, serum and kidney abnormalities and glomerular messenger RNA (mRNA) expression were compared with those in age-matched db/db mice housed under normoxia. RESULTS Levels of urinary albumin and podocalyxin (PCX) were significantly higher in hypoxic mice early during hypoxia. Ultracentrifugation of urine samples revealed that podocytes in the hypoxic mice shed PCX-positive microparticles into the urine. After 16 weeks of hypoxia, the mice also had higher hematocrits with lower serum glucose and various degrees of mesangiolytic glomerulosclerosis with microaneurysms and the infrequent occurrence of nodular lesions. Immunohistologically, hypoxic mice showed significantly decreased endothelial cell densities early during hypoxia and decreased podocyte densities later. In both hypoxic and normoxic mice, glomerular macrophage and transforming growth factor-β1 (TGF-β1) staining significantly increased with aging, without changes in vascular endothelial growth factor or endothelial nitric oxide synthase (eNOS). Glomerular mRNA expression of monocyte chemoattractant protein-1, eNOS and TGF-β1 was significantly enhanced in the hypoxic mice. CONCLUSIONS These results indicate that chronic hypoxia induces advanced glomerulosclerosis with accelerated albuminuria triggered by mesangiolysis and podocyte injury in a murine model of DN.
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Affiliation(s)
- Naoki Takahashi
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Haruyoshi Yoshida
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan.,Department of Internal Medicine, Sugita Genpaku Memorial Obama Municipal Hospital, Obama, Fukui, Japan
| | - Hideki Kimura
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan.,Department of Clinical Laboratory, University of Fukui Hospital, Fukui, Japan
| | - Kazuko Kamiyama
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Tomomi Kurose
- Department of Clinical Laboratory, University of Fukui Hospital, Fukui, Japan
| | - Hidehiro Sugimoto
- Department of Clinical Laboratory, University of Fukui Hospital, Fukui, Japan
| | - Toshio Imura
- Department of Clinical Laboratory, University of Fukui Hospital, Fukui, Japan
| | - Seiji Yokoi
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Daisuke Mikami
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Kenji Kasuno
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Hiroyuki Kurosawa
- Reagent R&D Department, Denka Seiken Co., Ltd, Gosen, Niigata, Japan
| | - Yoshiaki Hirayama
- Reagent R&D Department, Denka Seiken Co., Ltd, Gosen, Niigata, Japan
| | - Hironobu Naiki
- Department of Molecular Pathology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | | | - Masayuki Iwano
- Department of Nephrology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
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10
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Barreiro K, Dwivedi OP, Leparc G, Rolser M, Delic D, Forsblom C, Groop P, Groop L, Huber TB, Puhka M, Holthofer H. Comparison of urinary extracellular vesicle isolation methods for transcriptomic biomarker research in diabetic kidney disease. J Extracell Vesicles 2020; 10:e12038. [PMID: 33437407 PMCID: PMC7789228 DOI: 10.1002/jev2.12038] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 10/20/2020] [Accepted: 11/09/2020] [Indexed: 12/15/2022] Open
Abstract
Urinary Extracellular Vesicles (uEV) have emerged as a source for biomarkers of kidney damage, holding potential to replace the conventional invasive techniques including kidney biopsy. However, comprehensive studies characterizing uEV isolation methods with patient samples are rare. Here we compared performance of three established uEV isolation workflows for their subsequent use in transcriptomics analysis for biomarker discovery in diabetic kidney disease. We collected urine samples from individuals with type 1 diabetes with macroalbuminuria and healthy controls. We isolated uEV by Hydrostatic Filtration Dialysis (HFD), ultracentrifugation (UC), and a commercial kit- based isolation method (NG), each with different established urine clearing steps. Purified EVs were analysed by electron microscopy, nanoparticle tracking analysis, and Western blotting. Isolated RNAs were subjected to miRNA and RNA sequencing. HFD and UC samples showed close similarities based on mRNA sequencing data. NG samples had a lower number of reads and different mRNA content compared to HFD or UC. For miRNA sequencing data, satisfactory miRNA counts were obtained by all methods, but miRNA contents differed slightly. This suggests that the isolation workflows enrich specific subpopulations of miRNA-rich uEV preparation components. Our data shows that HFD,UC and the kit-based method are suitable methods to isolate uEV for miRNA-seq. However, only HFD and UC were suitable for mRNA-seq in our settings.
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Affiliation(s)
- Karina Barreiro
- Institute for Molecular Medicine Finland FIMMUniversity of HelsinkiHelsinkiFinland
| | - Om Prakash Dwivedi
- Institute for Molecular Medicine Finland FIMMUniversity of HelsinkiHelsinkiFinland
| | - German Leparc
- Boehringer Ingelheim Pharma GmbH & Co. KGBiberachGermany
| | - Marcel Rolser
- Boehringer Ingelheim Pharma GmbH & Co. KGBiberachGermany
| | - Denis Delic
- Boehringer Ingelheim Pharma GmbH & Co. KGBiberachGermany
- Fifth Department of Medicine (Nephrology/Endocrinology/Rheumatology), University Medical Centre MannheimUniversity of HeidelbergHeidelbergGermany
| | - Carol Forsblom
- Folkhälsan Institute of GeneticsFolkhälsan Research CenterHelsinkiFinland
- Abdominal Center, NephrologyUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
- Research Program for Clinical and Molecular Metabolism, Faculty of MedicineUniversity of HelsinkiHelsinkiFinland
| | - Per‐Henrik Groop
- Folkhälsan Institute of GeneticsFolkhälsan Research CenterHelsinkiFinland
- Abdominal Center, NephrologyUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
- Research Program for Clinical and Molecular Metabolism, Faculty of MedicineUniversity of HelsinkiHelsinkiFinland
- Department of Diabetes, Central Clinical SchoolMonash UniversityMelbourneVICAustralia
| | - Leif Groop
- Institute for Molecular Medicine Finland FIMMUniversity of HelsinkiHelsinkiFinland
| | - Tobias B. Huber
- III Department of MedicineUniversity Medical Center Hamburg‐EppendorfHamburgGermany
| | - Maija Puhka
- Institute for Molecular Medicine Finland FIMMUniversity of HelsinkiHelsinkiFinland
| | - Harry Holthofer
- Institute for Molecular Medicine Finland FIMMUniversity of HelsinkiHelsinkiFinland
- III Department of MedicineUniversity Medical Center Hamburg‐EppendorfHamburgGermany
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11
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Liu Y, Li S, Rong W, Zeng C, Zhu X, Chen Q, Li L, Liu ZH, Zen K. Podocyte-Released Migrasomes in Urine Serve as an Indicator for Early Podocyte Injury. KIDNEY DISEASES 2020; 6:422-433. [PMID: 33313063 DOI: 10.1159/000511504] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 09/10/2020] [Indexed: 12/20/2022]
Abstract
Background Levels of urinary microvesicles, which are increased during various kidney injuries, have diagnostic potential for renal diseases. However, the significance of urinary microvesicles as a renal disease indicator is dampened by the difficulty to ascertain their cell source. Objectives The aim of this study was to demonstrate that podocytes can release migrasomes, a unique class of microvesicle with size ranging between 400 and 2,000 nm, and the urine level of migrasomes may serve as novel non-invasive biomarker for early podocyte injury. Method In this study, immunofluorescence labeling, electronic microscopy, nanosite, and sequential centrifugation were used to purify and analyze migrasomes. Results Migrasomes released by podocytes differ from exosomes as they have different content and mechanism of release. Compared to podocytes, renal tubular cells secrete markedly less migrasomes. Moreover, secretion of migrasomes by human or murine podocytes was strongly augmented during podocyte injuries induced by LPS, puromycin amino nucleoside (PAN), or a high concentration of glucose (HG). LPS, PAN, or HG-induced podocyte migrasome release, however, was blocked by Rac-1 inhibitor. Strikingly, a higher level of podocyte migrasomes in urine was detected in mice with PAN-nephropathy than in control mice. In fact, increased urinary migrasome number was detected earlier than elevated proteinuria during PAN-nephropathy, suggesting that urinary migrasomes are a more sensitive podocyte injury indicator than proteinuria. Increased urinary migrasome number was also detected in diabetic nephropathy patients with proteinuria level <5.5 g/day. Conclusions Our findings reveal that podocytes release the "injury-related" migrasomes during migration and provide urinary podocyte migrasome as a potential diagnostic marker for early podocyte injury.
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Affiliation(s)
- Ying Liu
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.,Jiangsu Engineering Research Center for MicroRNA Biotechnology, Nanjing University School of Life Sciences, Nanjing, China
| | - Shan Li
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.,Jiangsu Engineering Research Center for MicroRNA Biotechnology, Nanjing University School of Life Sciences, Nanjing, China
| | - Weiwei Rong
- Jiangsu Engineering Research Center for MicroRNA Biotechnology, Nanjing University School of Life Sciences, Nanjing, China
| | - Caihong Zeng
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Xiaodong Zhu
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Qilin Chen
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Limin Li
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.,Jiangsu Engineering Research Center for MicroRNA Biotechnology, Nanjing University School of Life Sciences, Nanjing, China
| | - Zhi-Hong Liu
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Ke Zen
- National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.,Jiangsu Engineering Research Center for MicroRNA Biotechnology, Nanjing University School of Life Sciences, Nanjing, China
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12
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Matusek T, Marcetteau J, Thérond PP. Functions of Wnt and Hedgehog-containing extracellular vesicles in development and disease. J Cell Sci 2020; 133:133/18/jcs209742. [PMID: 32989011 DOI: 10.1242/jcs.209742] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Secreted morphogens play a major role in the intercellular communication necessary for animal development. It was initially thought that, in order to organize tissue morphogenesis and control cell fate and proliferation, morphogens diffused freely in the extracellular space. This view has since changed following the discovery that morphogens of the Wnt and Hedgehog (Hh) families are modified by various lipid adducts during their biosynthesis, providing them with high affinity for the membrane bilayer. Recent work performed in model organisms suggests that Wnt and Hh proteins are carried on extracellular vesicles. In this Review, we provide our perspectives on the mechanisms of formation of Wnt- and Hh-containing extracellular vesicles, and discuss their functions during animal development, as well as in various human physiopathologies.
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Affiliation(s)
- Tamás Matusek
- Université Côte d'Azur, CNRS, INSERM, Institut de Biologie Valrose (iBV), Parc Valrose, 06108 Nice Cedex 2, France
| | - Julien Marcetteau
- Université Côte d'Azur, CNRS, INSERM, Institut de Biologie Valrose (iBV), Parc Valrose, 06108 Nice Cedex 2, France
| | - Pascal P Thérond
- Université Côte d'Azur, CNRS, INSERM, Institut de Biologie Valrose (iBV), Parc Valrose, 06108 Nice Cedex 2, France
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13
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Svenningsen P, Sabaratnam R, Jensen BL. Urinary extracellular vesicles: Origin, role as intercellular messengers and biomarkers; efficient sorting and potential treatment options. Acta Physiol (Oxf) 2020; 228:e13346. [PMID: 31334916 DOI: 10.1111/apha.13346] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/16/2019] [Accepted: 07/16/2019] [Indexed: 12/14/2022]
Abstract
Urinary extracellular vesicles (uEVs) are a heterogenous group of vesicles consisting mainly of microvesicles and exosomes that originate predominantly (99.96%) from kidney, the urinary tract epithelium and the male reproductive tract. Secreted EVs contain molecular cargo from parental cells and provide an attractive source for biomarkers, a potential readout of physiological and pathophysiological mechanisms, and events associated with the urinary system. uEVs are readily enriched and isolated from urine samples and we review 6 standard methods that allow for downstream analysis of the uEV cargo. Although the use of uEVs as a surrogate readout for physiological changes in tissue protein levels is widespread, the protein abundance in uEVs is affected significantly by mechanisms that regulate protein sorting and secretion in uEVs. Data suggest that baseline kidney tissue and uEV levels of apical membrane-associated electrolyte transport proteins are not directly related in human patients. Recent evidence indicates that EVs may contribute to physiological and pathophysiological intercellular signalling and EVs confer protection against renal ischemia-reperfusion injury. The therapeutic use of EVs as information carriers has mainly been explored in vitro and a major hurdle lies in the translation of the in vitro findings into an in vivo setting. Thus, the EV research field is moving from a technical focus to a more physiological focus, allowing for a deeper understanding of human physiology, development of diagnostic tools and potential treatment strategies for precision medicine.
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Affiliation(s)
- Per Svenningsen
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine University of Southern Denmark Odense Denmark
| | - Rugivan Sabaratnam
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine University of Southern Denmark Odense Denmark
- Section of Molecular Diabetes & Metabolism, Institute of Clinical Research, Steno Diabetes Center Odense Odense University Hospital Odense C Denmark
| | - Boye L. Jensen
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine University of Southern Denmark Odense Denmark
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14
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Early Detection of Active Glomerular Lesions in Dogs and Cats Using Podocin. J Vet Res 2019; 63:573-577. [PMID: 31934669 PMCID: PMC6950428 DOI: 10.2478/jvetres-2019-0062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 11/05/2019] [Indexed: 12/04/2022] Open
Abstract
In veterinary medicine, sensitive and specific markers of the early stages of renal failure still remain to be established. Podocytes could be a promising diagnostic tool in veterinary nephrology, especially in the differentiation of active pathological disease and glomerulopathies. Podocin is one of the robust proteins exploitable in detection of podocyturia. This article presents podocyte detection in urine for diagnostic purposes in veterinary medicine using a variety of methods. We describe the advantages and disadvantages of the immunohistochemical technique currently used, and of scanning microscopy, chromatography, and immunostaining. The identification of podocin-positive cells is a promising diagnostic tool in the detection of the early stages of glomerular basement membrane damage. The detection of renal failure prior to the occurrence of azotaemia is of high clinical importance from the clinical and scientific points of view.
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15
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Lu J, Hu ZB, Chen PP, Lu CC, Zhang JX, Li XQ, Yuan BY, Huang SJ, Ma KL. Urinary levels of podocyte-derived microparticles are associated with the progression of chronic kidney disease. ANNALS OF TRANSLATIONAL MEDICINE 2019; 7:445. [PMID: 31700881 DOI: 10.21037/atm.2019.08.78] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Background Podocyte-derived microparticles (MPs) could be secreted from activated or apoptotic podocytes. An increased number of podocyte-derived MPs in the urine might reflect podocyte injury in renal diseases. This study aimed to observe the change of urinary podocyte-derived MP levels in patients with chronic kidney disease (CKD) and to further explore its correlation with the progression of CKD. Methods A prospective, longitudinal study was conducted in eighty patients with biopsy-proven CKD. Podocyte-derived MPs (annexin V and podocalyxin positive) were detected by flow cytometry. The number of urinary podocyte-derived MPs was analyzed to evaluate the association with biochemical measurements and pathological glomerulosclerosis assessment. Patients with idiopathic membranous nephropathy (IMN) were followed up after the six-month treatment of prednisone combined with tacrolimus to evaluate the association of urinary podocyte-derived MP levels and the remission of IMN. Results The CKD patients had higher urinary podocyte-derived MP levels compared with healthy controls (HCs). Baseline urinary levels of podocyte-derived MPs were positively correlated with 24-hour proteinuria, while were inversely correlated with the percentage of global glomerulosclerosis. The urinary podocyte-derived MPs levels had good discrimination for glomerulosclerosis [area under curve (AUC), 0.66]. The urinary podocyte-derived MPs levels in IMN patients were significantly decreased accompanied with the recovery of abnormal clinical parameters after six-month treatment. Conclusions The urinary levels of podocyte-derived MPs were closely associated with podocyte injury and glomerulosclerosis, which could be useful for monitoring disease activity in CKD patients. Urinary podocyte-derived MPs might be a non-invasive biomarker for the evaluation of early CKD progression.
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Affiliation(s)
- Jian Lu
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Ze-Bo Hu
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Pei-Pei Chen
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Chen-Chen Lu
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Jia-Xiu Zhang
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Xue-Qi Li
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Ben-Yin Yuan
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Si-Jia Huang
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
| | - Kun-Ling Ma
- Institute of Nephrology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China
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16
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El-Ashmawy HM, Selim FO, Hosny TAM, Almassry HN. Association of serum podocalyxin levels with peripheral arterial disease in patients with type 2 diabetes. J Diabetes Complications 2019; 33:495-499. [PMID: 31097305 DOI: 10.1016/j.jdiacomp.2019.04.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/17/2019] [Accepted: 04/06/2019] [Indexed: 11/21/2022]
Abstract
OBJECTIVE Renal podocalyxin is a marker for kidney diseases. Previous studies have shown the expression of serum podocalyxin (s-Podxl) in the endothelial cells of blood vessels. We aimed to investigate the association between s-podxl levels and peripheral arterial disease (PAD) in subjects with type 2 diabetes (T2DM). SUBJECTS AND METHODS Serum Podxl levels were analyzed in 69 subjects with normal glucose tolerance and PAD (NGT-PAD), 120 subjects with T2DM and PAD (D-PAD) and 36 subjects with T2DM without PAD (D-NPAD). RESULTS In D-PAD Patients, s-Podxl was significantly higher (17.67 ± 20.7 ng/mL) than in D-NPAD subjects (9.97 ± 5.34 ng/mL; P < 0.001). Subjects with NGT-PAD had significantly higher s-Podxl levels (15.34 ± 18.21 ng/mL), than D-NPAD patients (P < 0.001). Subjects with D-PAD and medial calcific sclerosis (MCS) had significantly higher s-Podxl levels compared to the same group but without MCS (P < 0.02). In D-PAD patients, MCS (P = 0.003) and glycosylated hemoglobin (P < 0.001) were the two variables that had the strongest prediction for s-Podxl as revealed by regression analysis. Multivariate regression showed that an increase of one standard deviation in s-Podxl was associated with an odds ratio of 3.4 (95% confidence interval = 2.2-4.6, P < 0.001) for the prevalence of PAD. CONCLUSIONS This is the first study showing an association between s-Podxl and PAD in patients with T2DM. S-Podxl was higher in D-PAD patients than in D-NPAD subjects. In NGT-PAD patients, s-Podxl was also higher than in D-NPAD patients. In patients with D-PAD, s-Podxl was positively associated with MCS.
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Affiliation(s)
- Hazem M El-Ashmawy
- Department of Internal Medicine, Zagazig University, Faculty of Medicine, Egypt.
| | - Fayrouz O Selim
- Department of Internal Medicine, Zagazig University, Faculty of Medicine, Egypt
| | - Thoraya A M Hosny
- Department of Clinical Pathology, Zagazig University, Faculty of Medicine, Egypt
| | - Hosam N Almassry
- Department of Radio-diagnosis, Zagazig University, Faculty of Medicine, Egypt
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17
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Hara M, Oohara K, Dai DF, Liapis H. Mitotic Catastrophe Causes Podocyte Loss in the Urine of Human Diabetics. THE AMERICAN JOURNAL OF PATHOLOGY 2018; 189:248-257. [PMID: 30472210 DOI: 10.1016/j.ajpath.2018.10.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 09/06/2018] [Accepted: 10/16/2018] [Indexed: 12/21/2022]
Abstract
Mitotic catastrophe (MC) is a major cause of podocyte loss in vitro and in vivo. We evaluated urine samples (n = 184 urine samples from diabetic patients; n = 41 patients) from diabetic patients and determined the presence of podocytes in the urine and studied their characteristics, specifically asking whether apoptosis versus MC is present. We also evaluated diabetic glomeruli in renal biopsy specimens by electron microscopy (n = 54). A battery of stains including the antibody to podocalyxin (PCX) were used. PCX and podocytes (PCX+podo) showed nuclear morphologies such as a i) mononucleated normal shape (8.7%), ii) large and abnormal shape (3.8%), iii) multinucleated with or without micronucleoli (31.2%), iv) mitotic spindles (8.2%), v) single nucleus and denucleation combined (10.3%), and vi) denucleation only (37.0%). Large size/abnormal shape, multinucleation, mitotic spindles, and a combination of single nucleus and denucleation were considered features of MC (53.5%). Dual staining of PCX+podo was positive for Glepp 1 (50%), whereas none of PCX+podo were positive for nephrin, podocin, leukocyte, or parietal epithelial cell markers (cytokeratin 8), annexin V, cleaved caspase-3, and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling. Ten percent of PCX+podo were positive for phosphorylated vimentin. Electron microscopy identified cellular and nuclear podocyte changes characteristic of MC. The majority of urine podocytes in diabetic patients showed MC, not apoptosis. This noninvasive approach may be clinically useful in determining progressive diabetic nephropathy or response to therapeutic intervention.
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Affiliation(s)
| | | | - Dao-Fu Dai
- Department of Pathology, University of Iowa, Iowa City, Iowa
| | - Helen Liapis
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri; Renal Pathology, Arkana Laboratories, Little Rock, Arkansas.
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18
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Akankwasa G, Jianhua L, Guixue C, Changjuan A, Xiaosong Q. Urine markers of podocyte dysfunction: a review of podocalyxin and nephrin in selected glomerular diseases. Biomark Med 2018; 12:927-935. [PMID: 29976076 DOI: 10.2217/bmm-2018-0152] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Urinary podocalyxin and nephrin are urine markers of podocyte dysfunction that may reflect the integrity of kidney's filtration barrier. Studies on their respective roles in glomerular diseases are still underway. However, the isolated and unsystematic manner in which they are being studied does not permit proper identification of their roles in each glomerular disease. As such, there is little or no appreciation of what research has already achieved and what remains to be achieved as the research direction is not clearly defined. We explored the recent studies and outlined the major findings regarding the value of both biomarkers in each of the three glomerular disease entities. Our review covered diabetic nephropathy, membranous nephropathy and IgA nephropathy.
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Affiliation(s)
- Gilbert Akankwasa
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District Shenyang, Liaoning 110004, PR China
| | - Liu Jianhua
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District Shenyang, Liaoning 110004, PR China
| | - Cheng Guixue
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District Shenyang, Liaoning 110004, PR China
| | - An Changjuan
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District Shenyang, Liaoning 110004, PR China
| | - Qin Xiaosong
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District Shenyang, Liaoning 110004, PR China
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19
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McNicholas K, Li JY, Michael MZ, Gleadle JM. Albuminuria is not associated with elevated urinary vesicle concentration but can confound nanoparticle tracking analysis. Nephrology (Carlton) 2018; 22:854-863. [PMID: 27496221 DOI: 10.1111/nep.12867] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 07/18/2016] [Accepted: 07/29/2016] [Indexed: 12/13/2022]
Abstract
AIM Extracellular vesicles, such as exosomes, are present in urine with reports of roles in intercellular signalling and diagnostic utility. However, the extent to which the concentration and characteristics of urinary vesicles are altered in albuminuric renal disease has not been well characterized. In this study, we examined the number and characteristics of extracellular vesicles in albuminuric urine. METHODS Vesicles were isolated from the urine of 32 patients with varying levels of albuminuria using ultracentrifugation and density gradient purification and were examined using nanoparticle tracking analysis, immunoblotting and transmission electron microscopy. The size profile of particles in these urine preparations was compared with albumin-containing solutions. RESULTS Overall, there were no substantial differences in the number, or characteristics, of vesicles released into proteinuric urine. Analysis of albumin-containing solutions showed particles of exosome-like size, suggesting that such particles can mimic exosomes in standard nanoparticle tracking analysis. Albumin and IgG depletion of proteinuric urine resulted in a substantial reduction in the concentration of particles detected by nanoparticle tracking analysis. CONCLUSION There was no increase in urinary vesicle concentration in patients with albuminuria. Furthermore, these results demonstrate the need for cautious interpretation of nanoparticle tracking analysis of vesicle concentration in biological fluids containing protein and for sophisticated preparative methods in vesicle purification from urine.
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Affiliation(s)
- Kym McNicholas
- Department of Renal Medicine, Flinders Medical Centre, Adelaide, South Australia, Australia.,School of Medicine, Flinders University, Adelaide, South Australia, Australia
| | - Jordan Yz Li
- Department of Renal Medicine, Flinders Medical Centre, Adelaide, South Australia, Australia.,School of Medicine, Flinders University, Adelaide, South Australia, Australia
| | - Michael Z Michael
- Department of Gastroenterology, Flinders Medical Centre, Adelaide, South Australia, Australia.,School of Medicine, Flinders University, Adelaide, South Australia, Australia
| | - Jonathan M Gleadle
- Department of Renal Medicine, Flinders Medical Centre, Adelaide, South Australia, Australia.,School of Medicine, Flinders University, Adelaide, South Australia, Australia
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20
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Shoji M, Takemoto M, Kobayashi K, Shoji T, Mori S, Sagara JI, Kurosawa H, Hirayama Y, Sakamoto K, Ishikawa T, Koshizaka M, Maezawa Y, Yokote K. Serum podocalyxin levels correlate with carotid intima media thickness, implicating its role as a novel biomarker for atherosclerosis. Sci Rep 2018; 8:245. [PMID: 29321582 PMCID: PMC5762903 DOI: 10.1038/s41598-017-18647-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 12/15/2017] [Indexed: 12/05/2022] Open
Abstract
Podocalyxin is a cell surface sialomucin, which is expressed in not only glomerular podocytes but also vascular endothelial cells. Urinary podocalyxin is used as a marker for glomerular disease. However, there are no reports describing serum podocalyxin (s-Podxl) levels. Therefore, the association between s-Podxl levels and clinical parameters were examined with 52 patients. s-Podxl level was evaluated using enzyme-linked immunosorbent assay. The median s-Podxl level was 14.2 ng/dL (interquartile range: 10.8–22.2 ng/dL). There were significant correlations (correlation coefficient: r > 0.2) of s-Podxl levels with carotid intima media thickness (IMT) (r = 0.30, p = 0.0307). Multiple logistic regression analysis showed that s-Podxl levels remained significantly associated with carotid IMT > 1 mm (OR: 1.15; 95% CI 1.02–1.31, p = 0.026) after adjustments for traditional cardiovascular risk factors such as age, sex, current smoking status, hypertension, dyslipidemias, and diabetes. In conclusion, s-Podxl is independently associated with carotid IMT and might be used as a novel biomarker for cardiovascular disease.
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Affiliation(s)
- Mayumi Shoji
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan
| | - Minoru Takemoto
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan. .,School of Medicine, International University of Health and Welfare, Department of Diabetes, Metabolism and Endocrinology, 4-3 Kozunomori, Narita-shi, Chiba, 286-8686, Japan.
| | - Kazuki Kobayashi
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Asahi Chuo Hospital, 1326, Ino, Asahi-shi, Chiba, 289-2511, Japan
| | - Toshihiro Shoji
- Department of Cardiology, Chiba Emergency Medical Center, Chiba, 3-32-1, Isobe, Mihama-ku, Chiba-shi, Chiba, 261-0012, Japan
| | - Satoka Mori
- Life Inovation Research Institute, Denka Co., Ltd, 3-5-1, Asahi-Machi, Machida-City, Tokyo, 194-0023, Japan
| | - Jun-Ichi Sagara
- Life Inovation Research Institute, Denka Co., Ltd, 3-5-1, Asahi-Machi, Machida-City, Tokyo, 194-0023, Japan
| | - Hiroyuki Kurosawa
- R&D Center, Denka Seikne Co., Ltd, 1359-1, Kagamida, Kigoshi, Gosen-City, Niigata, 959-1695, Japan
| | - Yoshiaki Hirayama
- R&D Center, Denka Seikne Co., Ltd, 1359-1, Kagamida, Kigoshi, Gosen-City, Niigata, 959-1695, Japan
| | - Kenichi Sakamoto
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan
| | - Takahiro Ishikawa
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan
| | - Masaya Koshizaka
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan
| | - Yoshiro Maezawa
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan
| | - Koutaro Yokote
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan.,Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba-shi, Chiba, 260-8670, Japan
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21
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Ikuma D, Hiromura K, Kajiyama H, Suwa J, Ikeuchi H, Sakairi T, Kaneko Y, Maeshima A, Kurosawa H, Hirayama Y, Yokota K, Araki Y, Sato K, Asanuma YF, Akiyama Y, Hara M, Nojima Y, Mimura T. The correlation of urinary podocytes and podocalyxin with histological features of lupus nephritis. Lupus 2017; 27:484-493. [PMID: 29050536 DOI: 10.1177/0961203317734918] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Objectives The objective of this study was to test the correlation of urinary podocyte number (U-Pod) and urinary podocalyxin levels (U-PCX) with histology of lupus nephritis. Methods This was an observational, cross-sectional study. Sixty-four patients were enrolled: 40 with lupus nephritis and 24 without lupus nephritis (12 lupus nephritis patients in complete remission and 12 systemic lupus erythematosus patients without lupus nephritis). Urine samples were collected before initiating treatment. U-Pod was determined by counting podocalyxin-positive cells, and U-PCX was measured by sandwich ELISA, normalized to urinary creatinine levels (U-Pod/Cr, U-PCX/Cr). Results Lupus nephritis patients showed significantly higher U-Pod/Cr and U-PCX/Cr compared with patients without lupus nephritis. U-Pod/Cr was high in proliferative lupus nephritis (class III±V/IV±V), especially in pure class IV (4.57 (2.02-16.75)), but low in pure class V (0.30 (0.00-0.71)). U-Pod/Cr showed a positive correlation with activity index ( r=0.50, P=0.0012) and was independently associated with cellular crescent formation. In contrast, U-PCX/Cr was high in both proliferative and membranous lupus nephritis. Receiver operating characteristic analysis revealed significant correlation of U-Pod/Cr with pure class IV, class IV±V and cellular crescent formation, and the combined values of U-Pod/Cr and U-PCX/Cr were shown to be associated with pure class V. Conclusions U-Pod/Cr and U-PCX/Cr correlate with histological features of lupus nephritis.
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Affiliation(s)
- D Ikuma
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - K Hiromura
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - H Kajiyama
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - J Suwa
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - H Ikeuchi
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - T Sakairi
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Y Kaneko
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - A Maeshima
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - H Kurosawa
- 3 Diagnostics Research Department, Denka Innovation Center, Tokyo, Japan
| | - Y Hirayama
- 3 Diagnostics Research Department, Denka Innovation Center, Tokyo, Japan
| | - K Yokota
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - Y Araki
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - K Sato
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - Y F Asanuma
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - Y Akiyama
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan.,4 Department of Rheumatology, Japanese Red Cross Ogawa Hospital, Saitama, Japan
| | - M Hara
- 5 Department of Pediatrics, Yoshida Hospital, Niigata, Japan
| | - Y Nojima
- 6 Department of Nephrology, Japanese Red Cross Maebashi Hospital, Gunma, Japan
| | - T Mimura
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
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PLA 2R binds to the annexin A2-S100A10 complex in human podocytes. Sci Rep 2017; 7:6876. [PMID: 28761153 PMCID: PMC5537237 DOI: 10.1038/s41598-017-07028-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 06/15/2017] [Indexed: 02/01/2023] Open
Abstract
Phospholipase A2 receptor (PLA2R) is a member of the mannose receptor family found in podocytes in human kidney. PLA2R is the target of the autoimmune disease, membranous nephropathy, characterised by production of anti-PLA2R autoantibodies which bind to the podocyte. However the function of PLA2R in health and in disease remains unclear. To gain insight into the molecular mechanisms of PLA2R function, we searched for its endogenous binding partners. Proteomic analysis identified annexinA2 as a potential interactor with the extracellular domains of PLA2R. We confirmed that PLA2R binds to annexinA2-S100A10 (A2t) complex with specific high affinity to the S100A10 component. The binding occured within the PLA2R NC3 fragment and was increased in acidic pH. Furthermore Ca2+ promoted the association of the PLA2R-A2t complex with phospholipid membranes in vitro. Within the podocyte, all three proteins were enriched in the plasma membrane and organelle membrane compartments. PLA2R co-localised with S100A10 at the cell surface and in extracellular vesicles. This novel interaction between PLA2R and the A2t complex offers insights into the role of PLA2R in podocytes and how autoantibodies might disrupt PLA2R function. The ability of podocytes to secrete vesicles containing PLA2R provides a route for engagement of PLA2R with the immune system.
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Abstract
Extracellular vesicles are a heterogeneous population of microparticles released by virtually all living cells which have been recently widely investigated in different biological fields. They are typically composed of two primary types (exosomes and microvesicles) and are recently commanding increasing attention as mediators of cellular signaling. Indeed, these vesicles can affect recipient cells by carrying and delivering complex cargos of biomolecules (including proteins, lipids and nucleic acids), protected from enzymatic degradation in the environment. Their importance has been demonstrated in the pathophysiology of several organs, in particular in kidney, where different cell types secrete extracellular vesicles that mediate their communication with downstream urinary tract cells. Over the past few years, evidence has been shown that vesicles participate in kidney development and normal physiology. Moreover, EVs are widely demonstrated to be implicated in cellular signaling during renal regenerative and pathological processes. Although many EV mechanisms are still poorly understood, in particular in kidney, the discovery of their role could help to shed light on renal biological processes which are so far elusive. Lastly, extracellular vesicles secreted by renal cells gather in urine, thus becoming a great resource for disease or recovery markers and a promising non-invasive diagnostic instrument for renal disease. In the present review, we discuss the most recent findings on the role of extracellular vesicles in renal physiopathology and their potential implication in diagnosis and therapy.
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Affiliation(s)
| | - Chiara Gai
- Stem Cell Laboratory, Department of Medical Sciences, University of TurinTurin, Italy
| | - Benedetta Bussolati
- Department of Molecular Biotechnology and Health Sciences, University of TurinTurin, Italy
| | - Giovanni Camussi
- Stem Cell Laboratory, Department of Medical Sciences, University of TurinTurin, Italy
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Musante L, Tataruch-Weinert D, Kerjaschki D, Henry M, Meleady P, Holthofer H. Residual urinary extracellular vesicles in ultracentrifugation supernatants after hydrostatic filtration dialysis enrichment. J Extracell Vesicles 2016; 6:1267896. [PMID: 28326167 PMCID: PMC5328348 DOI: 10.1080/20013078.2016.1267896] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Indexed: 12/16/2022] Open
Abstract
Urinary extracellular vesicles (UEVs) appear an ideal source of biomarkers for kidney and urogenital diseases. The majority of protocols designed for their isolation are based on differential centrifugation steps. However, little is still known of the type and amount of vesicles left in the supernatant. Here we used an isolation protocol for UEVs which uses hydrostatic filtration dialysis as first pre-enrichment step, followed by differential centrifugation. Transmission electron microscopy (TEM), mass spectrometry (MS), western blot, ELISA assays and tuneable resistive pulse sensing (TRPS) were used to characterise and quantify UEVs in the ultracentrifugation supernatant. TEM showed the presence of a variety of small size vesicles in the supernatant while protein identification by MS matched accurately with the protein list available in Vesiclepedia. Screening and relative quantification for specific vesicle markers showed that the supernatant was preferentially positive for CD9 and TSG101. ELISA tests for quantification of exosome revealed that 14%, was left in the supernatant with a particle diameter of 110 nm and concentration of 1.54 × 1010/ml. Here we show a comprehensive characterisation of exosomes and other small size urinary vesicles which the conventional differential centrifugation protocol may lose.
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Affiliation(s)
- Luca Musante
- Centre for BioAnalytical Sciences, Dublin City University , Dublin 9 , Ireland
| | | | - Dontscho Kerjaschki
- Clinical Institute of Pathology, Medical University of Vienna , Vienna , Austria
| | - Michael Henry
- National Institute for Cellular Biotechnology, Dublin City University , Dublin 9 , Ireland
| | - Paula Meleady
- National Institute for Cellular Biotechnology, Dublin City University , Dublin 9 , Ireland
| | - Harry Holthofer
- Freiburg Institute for Advanced Studies, Albert-Ludwigs University , Freiburg , Germany
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Imaizumi T, Nakatochi M, Akiyama S, Yamaguchi M, Kurosawa H, Hirayama Y, Katsuno T, Tsuboi N, Hara M, Maruyama S. Urinary Podocalyxin as a Biomarker to Diagnose Membranous Nephropathy. PLoS One 2016; 11:e0163507. [PMID: 27668430 PMCID: PMC5036798 DOI: 10.1371/journal.pone.0163507] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 09/09/2016] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND A non-invasive diagnostic marker of membranous nephropathy (MN) is desirable. The urinary level of podocalyxin (PCX) is higher in various glomerular diseases, including MN. The aim of this study was to construct a diagnostic model of MN with the combination of urinary PCX and clinical parameters. METHODS We performed this cross-sectional study to construct the diagnostic models for MN by using data and samples from the multicenter kidney biopsy registry of Nagoya University and its affiliated hospitals. Urinary (u-) PCX was measured by sandwich ELISA. We constructed 3 types of diagnostic models in 105 training samples: u-PCX univariate model, the combined model of clinical parameters other than u-PCX (clinical model), and the combined model of both u-PCX and clinical parameters (combined model). We assessed the clinical usefulness of the diagnostic models through the comparison of c-statistics and decision curve analysis (DCA) in 209 validation samples. RESULTS The clinical model consisted of age, glomerular filtration rate, and diabetes mellitus. In the training cohort, the c-statistics were 0.868 [95% CI, 0.799-0.937] in the combined model. In the validation cohort, sensitivity was 80.5% and specificity was 73.5% on the cut-off value. The net benefit of the combined model was better between threshold probabilities of 40-80% in DCA. CONCLUSIONS In this study, we demonstrated the utility of u-PCX as a diagnostic marker for MN and the clinical usefulness of the diagnostic models, through the combination of u-PCX and clinical parameters including age, glomerular filtration rate, and diabetes mellitus.
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Affiliation(s)
- Takahiro Imaizumi
- Department of Nephrology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masahiro Nakatochi
- Biostatistics and Bioinformatics Section, Center for Advanced Medicine and Clinical Research, Nagoya University Hospital, Nagoya, Japan
| | - Shin’ichi Akiyama
- Department of Nephrology, Nagoya University Graduate School of Medicine, Nagoya, Japan
- * E-mail:
| | - Makoto Yamaguchi
- Department of Nephrology, Yokkaichi Municipal Hospital, Yokkaichi, Japan
| | | | | | - Takayuki Katsuno
- Department of Nephrology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Naotake Tsuboi
- Department of Nephrology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masanori Hara
- Department of Pediatrics, Niigata prefecture Yoshida hospital, Tsubame, Japan
| | - Shoichi Maruyama
- Department of Nephrology, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Li L, Wang J, Li Y, Lu C, Liu Y, Zhang Z, Wang ZE, Zhang J, Lu Z. The Podocyte Count Detected by an Improved Immunocytochemical Method has Higher Diagnostic Efficiency than Enzyme-Linked Immunosorbent Assay and Serum Cystatin C to Evaluate the Early Stage Damage of Glomerular. J Clin Lab Anal 2016; 31. [PMID: 27435507 DOI: 10.1002/jcla.22029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 06/28/2016] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND In renal diseases, earlier injury to glomerular may lead to the abscission of podocyte. The number of podocyte in urine may reflect the severity of glomerular damage. Podocalyxin (PCX) was considered as a podocyte marker. Many methods were used to detect podocyte. Applications of these methods were limited by tricky, expensive, and low accuracy. Here, we improved an immunocytochemical method to count the number of podocyte in urine. METHODS In this study, we counted the numbers of podocyte in urine by our improved method and detected the PCX levels in urine by enzyme-linked immunosorbent assay (ELISA) in glomerulopathy patients and healthy controls. The serum levels of cystatin C (CysC), blood urea nitrogen (BUN), creatinine (CR), uric acid (URIC), and β2-Microglobulin (β2-MG) in all subjects were detected. Correlation analysis and diagnostic efficiencies comparisons among immuocytochemical method, ELISA, and the biochemistry index were also performed. RESULTS The podocyte counts in patients were significantly higher than controls. Podocytes counts positively correlated with PCX concentrations and the serum CysC. The podocyte count had higher diagnostic efficiency than PCX concentrations detected by ELISA and serum CysC. CONCLUSIONS The podocyte count detected by our improved method had higher diagnostic efficiency than ELISA and serum CysC.
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Affiliation(s)
- Li Li
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Jing Wang
- Department of Pulmonary Function Laboratory, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Yi Li
- Department of Bone and Joint Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Chao Lu
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Yiqing Liu
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Zhifen Zhang
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Zi-E Wang
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Jian Zhang
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Zhiming Lu
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
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27
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Wada Y, Abe M, Moritani H, Mitori H, Kondo M, Tanaka-Amino K, Eguchi M, Imasato A, Inoki Y, Kajiyama H, Mimura T, Tomura Y. Original Research: Potential of urinary nephrin as a biomarker reflecting podocyte dysfunction in various kidney disease models. Exp Biol Med (Maywood) 2016; 241:1865-76. [PMID: 27216597 DOI: 10.1177/1535370216651937] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 04/26/2016] [Indexed: 01/01/2023] Open
Abstract
Urinary nephrin is a potential non-invasive biomarker of disease. To date, however, most studies of urinary nephrin have been conducted in animal models of diabetic nephropathy, and correlations between urinary nephrin-to-creatinine ratio and other parameters have yet to be evaluated in animal models or patients of kidney disease with podocyte dysfunction. We hypothesized that urinary nephrin-to-creatinine ratio can be up-regulated and is negatively correlated with renal nephrin mRNA levels in animal models of kidney disease, and that increased urinary nephrin-to-creatinine ratio levels are attenuated following administration of glucocorticoids. In the present study, renal nephrin mRNA, urinary nephrin-to-creatinine ratio, urinary protein-to-creatinine ratio, and creatinine clearance ratio were measured in animal models of adriamycin nephropathy, puromycin aminonucleoside nephropathy, anti-glomerular basement membrane glomerulonephritis, and 5/6 nephrectomy. The effects of prednisolone on urinary nephrin-to-creatinine ratio and other parameters in puromycin aminonucleoside (single injection) nephropathy rats were also investigated. In all models tested, urinary nephrin-to-creatinine ratio and urinary protein-to-creatinine ratio increased, while renal nephrin mRNA and creatinine clearance ratio decreased. Urinary nephrin-to-creatinine ratio exhibited a significant negative correlation with renal nephrin mRNA in almost all models, as well as a significant positive correlation with urinary protein-to-creatinine ratio and a significant negative correlation with creatinine clearance ratio. Urinary protein-to-creatinine ratio exhibited a significant negative correlation with renal nephrin mRNA. Following the administration of prednisolone to puromycin aminonucleoside (single injection) nephropathy rats, urinary nephrin-to-creatinine ratio was significantly suppressed and exhibited a significant positive correlation with urinary protein-to-creatinine ratio. In addition, the decrease in number of glomerular Wilms tumor antigen-1-positive cells was attenuated, and urinary nephrin-to-creatinine ratio exhibited a significant negative correlation in these cells. In conclusion, these results suggest that urinary nephrin-to-creatinine ratio level is a useful and reliable biomarker for predicting the amelioration of podocyte dysfunction by candidate drugs in various kidney disease models with podocyte dysfunction. This suggestion will also be validated in a clinical setting in future studies.
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Affiliation(s)
- Yusuke Wada
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Masaki Abe
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Hiroshi Moritani
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Hikaru Mitori
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Mitsuhiro Kondo
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Keiko Tanaka-Amino
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Megumi Eguchi
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Akira Imasato
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Yutaka Inoki
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
| | - Hiroshi Kajiyama
- Department of Rheumatology and Applied Immunology, Faculty of Medicine, Saitama Medical University, Moroyama 3500495, Japan
| | - Toshihide Mimura
- Department of Rheumatology and Applied Immunology, Faculty of Medicine, Saitama Medical University, Moroyama 3500495, Japan
| | - Yuichi Tomura
- Drug Discovery Research, Astellas Pharma Inc., Tasukuba-shi, Ibaraki 3058585, Japan
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Kikuchi M, Wickman L, Hodgin JB, Wiggins RC. Podometrics as a Potential Clinical Tool for Glomerular Disease Management. Semin Nephrol 2016. [PMID: 26215862 DOI: 10.1016/j.semnephrol.2015.04.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Chronic kidney disease culminating in end-stage kidney disease is a major public health problem costing in excess of $40 billion per year with high morbidity and mortality. Current tools for glomerular disease monitoring lack precision and contribute to poor outcome. The podocyte depletion hypothesis describes the major mechanisms underlying the progression of glomerular diseases, which are responsible for more than 80% of cases of end-stage kidney disease. The question arises of whether this new knowledge can be used to improve outcomes and reduce costs. Podocytes have unique characteristics that make them an attractive monitoring tool. Methodologies for estimating podocyte number, size, density, glomerular volume and other parameters in routine kidney biopsies, and the rate of podocyte detachment from glomeruli into urine (podometrics) now have been developed and validated. They potentially fill important gaps in the glomerular disease monitoring toolbox. The application of these tools to glomerular disease groups shows good correlation with outcome, although data validating their use for individual decision making is not yet available. Given the urgency of the clinical problem, we argue that the time has come to focus on testing these tools for application to individualized clinical decision making toward more effective progression prevention.
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Affiliation(s)
- Masao Kikuchi
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI
| | - Larysa Wickman
- Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, MI
| | | | - Roger C Wiggins
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI.
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Shoji M, Kobayashi K, Takemoto M, Sato Y, Yokote K. Urinary podocalyxin levels were associated with urinary albumin levels among patients with diabetes. Biomarkers 2015; 21:164-7. [PMID: 26635084 DOI: 10.3109/1354750x.2015.1118551] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Diabetic nephropathy has dramatically increased worldwide. In this study, we measured urinary podocalyxin in 240 patients with diabetes. The relationship between urinary podocalyxin and clinical parameters and the effects of dipeptidyl peptidase-4 inhibitors (DPP4i) and alpha-glucosidase inhibitor (a-GI) on urinary podocalyxin levels were examined. Urinary podocalyxin levels were significantly higher in patients with microalbuminuria than in those with normoalbuminuria. Urinary podocalyxin levels were also significantly related to albumin-to-creatinine ratio. Neither DPP4i nor α-GI ameliorated the increase in urinary podocalyxin levels. Our results indicated that urinary podocalyxin will be not only an early marker but also a treatment target for DN.
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Affiliation(s)
- M Shoji
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
| | - K Kobayashi
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
| | - M Takemoto
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
| | - Y Sato
- c Clinical Research Center, Chiba University Hospital , Chiba , Japan
| | - K Yokote
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
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Erdbrügger U, Le TH. Extracellular Vesicles in Renal Diseases: More than Novel Biomarkers? J Am Soc Nephrol 2015; 27:12-26. [PMID: 26251351 DOI: 10.1681/asn.2015010074] [Citation(s) in RCA: 148] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Extracellular vesicles from the urine and circulation have gained significant interest as potential diagnostic biomarkers in renal diseases. Urinary extracellular vesicles contain proteins from all sections of the nephron, whereas most studied circulating extracellular vesicles are derived from platelets, immune cells, and the endothelium. In addition to their diagnostic role as markers of kidney and vascular damage, extracellular vesicles may have functional significance in renal health and disease by facilitating communication between cells and protecting against kidney injury and bacterial infection in the urinary tract. However, the current understanding of extracellular vesicles has derived mostly from studies with very small numbers of patients or in vitro data. Moreover, accurate assessment of these vesicles remains a challenge, in part because of a lack of consensus in the methodologies to measure extracellular vesicles and the inability of most techniques to capture the entire size range of these vesicles. However, newer techniques and standardized protocols to improve the detection of extracellular vesicles are in development. A clearer understanding of the composition and biology of extracellular vesicles will provide insights into their pathophysiologic, diagnostic, and therapeutic roles.
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Affiliation(s)
- Uta Erdbrügger
- Department of Medicine, Division of Nephrology, University of Virginia Health System, Charlottesville, Virginia
| | - Thu H Le
- Department of Medicine, Division of Nephrology, University of Virginia Health System, Charlottesville, Virginia
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Abstract
The podocyte is a highly differentiated cell located in the outer space of the glomerular basement membrane that deals with many different functions. This phylogenetically preserved cell that is responsible for the virtually absence of proteins in the urine lacks of the capacity to divide under normal conditions. When podocytes receive molecular insults, which normally occur during stress conditions as glomerulonephritis, hyperfiltration or metabolic disturbances, they adapt to the new situation by contracting their actin fibers. This adaptive behavior puts at risk the quality of the plasmatic filtration due to the denudation of the glomerular basement membrane, the potential mesangial inflammation and the appearance of proteinuria; podocytes run the risk of detachment from the basement membrane due to a decrease in the adherence to the surrounding matrix after contraction, a process called foot processes effacement. Podocytes change their shape and under constant mechanical stress they finally detach, rendering the glomerular basement membrane unprotected unless other contiguous podocytes are capable of covering the surface. However, these still anchored podocytes are generally also under the same stress situation and follow the same pathway. Podocyturia refers to the presence of these differentiated cells in the urinary sediment. Noteworthy, the podocytes that are encountered in the urine are viable despite the glomerular hostile environment and the urinary acidity. Podocyturia can precede proteinuria and can aggravate it. Therefore, in diseases that can threaten the glomerular normal environment, the presence and the quantification of urinary podocytes can be of remarkable relevance, as it can herald or accompany the appearance of proteinuria, and could offer another view to the interpretation and clinical approach and outcome of proteinuria. However, its identification needs a wide-spread training among biochemists and technicians, as well as commercially available kits.
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Affiliation(s)
- Hernán Trimarchi
- Nephrology and Kidney Transplant Unit, Department of Medicine, Hospital Británico de Buenos Aires, Buenos Aires, Argentina
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Hodgin JB, Bitzer M, Wickman L, Afshinnia F, Wang SQ, O'Connor C, Yang Y, Meadowbrooke C, Chowdhury M, Kikuchi M, Wiggins JE, Wiggins RC. Glomerular Aging and Focal Global Glomerulosclerosis: A Podometric Perspective. J Am Soc Nephrol 2015; 26:3162-78. [PMID: 26038526 DOI: 10.1681/asn.2014080752] [Citation(s) in RCA: 164] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 02/08/2015] [Indexed: 11/03/2022] Open
Abstract
Kidney aging is associated with an increasing proportion of globally scarred glomeruli, decreasing renal function, and exponentially increasing ESRD prevalence. In model systems, podocyte depletion causes glomerulosclerosis, suggesting age-associated glomerulosclerosis could be caused by a similar mechanism. We measured podocyte number, size, density, and glomerular volume in 89 normal kidney samples from living and deceased kidney donors and normal poles of nephrectomies. Podocyte nuclear density decreased with age due to a combination of decreased podocyte number per glomerulus and increased glomerular volume. Compensatory podocyte cell hypertrophy prevented a change in the proportion of tuft volume occupied by podocytes. Young kidneys had high podocyte reserve (podocyte density >300 per 10(6) µm(3)), but by 70-80 years of age, average podocyte nuclear density decreased to, <100 per 10(6) µm(3), with corresponding podocyte hypertrophy. In older age podocyte detachment rate (urine podocin mRNA-to-creatinine ratio) was higher than at younger ages and podocytes were stressed (increased urine podocin-to-nephrin mRNA ratio). Moreover, in older kidneys, proteinaceous material accumulated in the Bowman space of glomeruli with low podocyte density. In a subset of these glomeruli, mass podocyte detachment events occurred in association with podocytes becoming binucleate (mitotic podocyte catastrophe) and subsequent wrinkling of glomerular capillaries, tuft collapse, and periglomerular fibrosis. In kidneys of young patients with underlying glomerular diseases similar pathologic events were identified in association with focal global glomerulosclerosis. Podocyte density reduction with age may therefore directly lead to focal global glomerulosclerosis, and all progressive glomerular diseases can be considered superimposed accelerators of this underlying process.
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Affiliation(s)
| | | | - Larysa Wickman
- Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, Michigan
| | | | | | | | | | - Chrysta Meadowbrooke
- Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, Michigan
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Glomerular endothelial cell injury and focal segmental glomerulosclerosis lesion in idiopathic membranous nephropathy. PLoS One 2015; 10:e0116700. [PMID: 25875837 PMCID: PMC4398543 DOI: 10.1371/journal.pone.0116700] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 12/12/2014] [Indexed: 11/19/2022] Open
Abstract
Background Focal segmental glomerulosclerosis (FSGS) lesions have often been discussed as a negative predictor in idopathic membranous nephropathy (MN). The mechanism of the development of FSGS lesion in MN is still uncertain. Methods From 250 cases of MN, 26 cases contained FSGS lesion. We compared the clinicopathological characteristics between MN cases with FSGS lesion [MN-FSGS(+)] and MN without FSGS lesion [MN-FSGS(−)], matched for gender, age, stage of MN. Results The glomerular filtration rate (eGFR) was significantly lower in MN-FSGS(+) cases compared to MN-FSGS(−), although nephrotic syndrome, hematuria, and systolic blood pressure levels were not significantly different between the two groups. Pathologically, glomeruli in MN-FSGS(+) cases showed narrowing and loss of glomerular capillaries with separating from GBM or disappearance of CD34+ endothelial cells, and accumulation of extracellular matrix (ECM) in capillary walls, indicating the development of glomerular capillary injury. These findings of endothelial injury were seen even in MN-FSGS(−) cases, but they were more prominent in MN-FSGS(+) than MN-FSGS(−) by computer assessed morphometric analysis. In MN-FSGS(+) cases, 44 out of 534 glomeruli (8.2%) contained FSGS lesions (n = 31, NOS lesion; n = 13, perihilar lesion). Significant thickness of GBM with ECM accumulation was evident in MN-FSGS(+) cases. Podocyte injury with effacement of foot processes was also noted, but the expression of VEGF on podocytes was not different between the two groups, which suggests that the significant thickness of capillary walls may influence the function of VEGF from podocyte resulting in the glomerular capillary injury that contribute to the development of FSGS lesion in MN. Conclusion Glomerular capillary injury was seen in all MN cases. Furthermore, the prominent injuries of glomerular capillaries may be associated with the deterioration of eGFR and the formation of FSGS lesions in MN.
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Physical characterization and profiling of airway epithelial derived exosomes using light scattering. Methods 2015; 87:59-63. [PMID: 25823850 DOI: 10.1016/j.ymeth.2015.03.013] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 03/17/2015] [Accepted: 03/22/2015] [Indexed: 01/21/2023] Open
Abstract
Exosomes and other extracellular vesicles have been gaining interest during the last decade due to their emerging role in biology and, disease pathogenesis and their biomarker potential. Almost all published research related to exosomes and other extracellular vesicles include some form of physical characterization. Therefore, these vesicles should be precisely profiled and characterized physically before studying their biological role as intercellular messengers, biomarkers or therapeutic tools. Using a combination of light scattering techniques, including dynamic light scattering (DLS) and multi-angle laser light scattering combined with size exclusion separation (SEC-MALLS), we physically characterized and compared distinct extracellular vesicles derived from the apical secretions of two different cultured airway epithelial cells. The results indicated that epithelial cells release vesicles with distinct physical properties and sizes. Human primary tracheobronchial cell culture (HTBE) derived vesicles have a hydrodynamic radius (Rh) of approximately 340 nm while their radius of gyration (Rg) is approximately 200 nm. Electron microscopy analysis, however, revealed that their spherical component is 40-100 nm in size, and they carry filamentous, entangled membrane mucins on their surface that increases their overall radius. The mucin decoration on the surface defines their size and charge as measured using light scattering techniques. Their surface properties mirror the properties of the cells from which they are derived. This may provide a unique tool for researchers to elucidate the unanswered questions in normal airway biology and innate and adaptive defense, including the remodeling of airways during inflammation, tumorigenesis and metastasis.
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Sáenz-Cuesta M, Arbelaiz A, Oregi A, Irizar H, Osorio-Querejeta I, Muñoz-Culla M, Banales JM, Falcón-Pérez JM, Olascoaga J, Otaegui D. Methods for extracellular vesicles isolation in a hospital setting. Front Immunol 2015; 6:50. [PMID: 25762995 PMCID: PMC4327731 DOI: 10.3389/fimmu.2015.00050] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 01/27/2015] [Indexed: 12/27/2022] Open
Abstract
The research in extracellular vesicles (EVs) has been rising during the last decade. However, there is no clear consensus on the most accurate protocol to isolate and analyze them. Besides, most of the current protocols are difficult to implement in a hospital setting due to being very time-consuming or to requirements of specific infrastructure. Thus, our aim is to compare five different protocols (comprising two different medium-speed differential centrifugation protocols; commercially polymeric precipitation – exoquick – acid precipitation; and ultracentrifugation) for blood and urine samples to determine the most suitable one for the isolation of EVs. Nanoparticle tracking analysis, flow cytometry, western blot (WB), electronic microscopy, and spectrophotometry were used to characterize basic aspects of EVs such as concentration, size distribution, cell-origin and transmembrane markers, and RNA concentration. The highest EV concentrations were obtained using the exoquick protocol, followed by both differential centrifugation protocols, while the ultracentrifugation and acid-precipitation protocols yielded considerably lower EV concentrations. The five protocols isolated EVs of similar characteristics regarding markers and RNA concentration; however, standard protocol recovered only small EVs. EV isolated with exoquick presented difficult to be analyzed with WB. The RNA concentrations obtained from urine-derived EVs were similar to those obtained from blood-derived ones, despite the urine EV concentration being 10–20 times lower. We consider that a medium-speed differential centrifugation could be suitable to be applied in a hospital setting as it requires the simplest infrastructure and recovers higher concentration of EV than standard protocol. A workflow from sampling to characterization of EVs is proposed.
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Affiliation(s)
- Matías Sáenz-Cuesta
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain ; Spanish Network on Multiple Sclerosis , Madrid , Spain
| | - Ander Arbelaiz
- Department of Liver and Gastrointestinal Diseases, Biodonostia Health Research Institute, Donostia University Hospital , San Sebastián , Spain ; University of the Basque Country , San Sebastián , Spain
| | - Amaia Oregi
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain
| | - Haritz Irizar
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain ; Spanish Network on Multiple Sclerosis , Madrid , Spain
| | - Iñaki Osorio-Querejeta
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain ; Spanish Network on Multiple Sclerosis , Madrid , Spain
| | - Maider Muñoz-Culla
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain ; Spanish Network on Multiple Sclerosis , Madrid , Spain
| | - Jesus M Banales
- Department of Liver and Gastrointestinal Diseases, Biodonostia Health Research Institute, Donostia University Hospital , San Sebastián , Spain ; University of the Basque Country , San Sebastián , Spain ; National Institute for the Study of Liver and Gastrointestinal Diseases (CIBERehd, Instituto de Salud Carlos III) , Madrid , Spain ; Ikerbasque - Basque Foundation for Science , Bilbao , Spain ; Asociación Española Contra el Cáncer , Madrid , Spain
| | - Juan M Falcón-Pérez
- National Institute for the Study of Liver and Gastrointestinal Diseases (CIBERehd, Instituto de Salud Carlos III) , Madrid , Spain ; Ikerbasque - Basque Foundation for Science , Bilbao , Spain ; Metabolomics Unit, CIC bioGUNE , Derio , Spain
| | - Javier Olascoaga
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain ; Spanish Network on Multiple Sclerosis , Madrid , Spain ; Department of Neurology, Donostia University Hospital , San Sebastián , Spain
| | - David Otaegui
- Multiple Sclerosis Unit, Neuroscience Area, Biodonostia Health Research Institute , San Sebastián , Spain ; Spanish Network on Multiple Sclerosis , Madrid , Spain
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Ranghino A, Dimuccio V, Papadimitriou E, Bussolati B. Extracellular vesicles in the urine: markers and mediators of tissue damage and regeneration. Clin Kidney J 2014; 8:23-30. [PMID: 25713706 PMCID: PMC4310438 DOI: 10.1093/ckj/sfu136] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 12/05/2014] [Indexed: 01/08/2023] Open
Abstract
As in several body fluids, urine is a rich reservoir of extracellular vesicles (EVs) directly originating from cells facing the urinary lumen, including differentiated tubular cells, progenitor cells and infiltrating inflammatory cells. Several markers of glomerular and tubular damage, such as WT-1, ATF3 and NGAL, as well as of renal regeneration, such as CD133, have been identified representing an incredible source of information for diagnostic purposes. In addition, urinary extracellular vesicles (uEVs) appear to be involved in the cell-to-cell communication along the nephron, although this aspect needs further elucidation. Finally, uEVs emerge as potential amplifying or limiting factors in renal damage. Vesicles from injured cells may favour fibrosis and disease progression whereas those from cells with regenerative potential appear to promote cell survival. Here, we will discuss the most recent findings of the literature, on the light of the role of EVs in diagnosis and therapy for damage and repair of the renal tissue.
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Affiliation(s)
- Andrea Ranghino
- Department of Molecular Biotechnology and Health Sciences , University of Torino , Torino , Italy ; Department of Medical Sciences , University of Torino , Torino , Italy
| | - Veronica Dimuccio
- Department of Molecular Biotechnology and Health Sciences , University of Torino , Torino , Italy
| | - Elli Papadimitriou
- Department of Molecular Biotechnology and Health Sciences , University of Torino , Torino , Italy
| | - Benedetta Bussolati
- Department of Molecular Biotechnology and Health Sciences , University of Torino , Torino , Italy
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Musante L, Tataruch DE, Holthofer H. Use and isolation of urinary exosomes as biomarkers for diabetic nephropathy. Front Endocrinol (Lausanne) 2014; 5:149. [PMID: 25309511 PMCID: PMC4176463 DOI: 10.3389/fendo.2014.00149] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 09/05/2014] [Indexed: 01/08/2023] Open
Abstract
Diabetes represents a major threat to public health and the number of patients is increasing alarmingly in the global scale. Particularly, the diabetic kidney disease (nephropathy, DN) together with its cardiovascular complications cause immense human suffering, highly increased risk of premature deaths, and lead to huge societal costs. DN is first detected when protein appears in urine (microalbuminuria). As in other persisting proteinuric diseases (like vasculitis) it heralds irreversible damage of kidney functions up to non-functional (end-stage) kidney and ultimately calls for kidney replacement therapy (dialysis or kidney transplantation). While remarkable progress has been made in understanding the genetic and molecular factors associating with chronic kidney diseases, breakthroughs are still missing to provide comprehensive understanding of events and mechanisms associated. Non-invasive diagnostic tools for early diagnostics of kidney damage are badly needed. Exosomes - small vesicular structures present in urine are released by all cell types along kidney structures to present with distinct surface assembly. Furthermore, exosomes carry a load of special proteins and nucleic acids. This "cargo" faithfully reflects the physiological state of their respective cells of origin and appears to serve as a new pathway for downstream signaling to target cells. Accordingly, exosome vesicles are emerging as a valuable source for disease stage-specific information and as fingerprints of disease progression. Unfortunately, technical issues of exosome isolation are challenging and, thus, their full potential remains untapped. Here, we review the molecular basis of exosome secretion as well as their use to reveal events along the nephron. In addition to novel molecular information, the new methods provide the needed accurate, personalized, non-invasive, and inexpensive future diagnostics.
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Affiliation(s)
- Luca Musante
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Dorota Ewa Tataruch
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Harry Holthofer
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
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Pocsfalvi G, Stanly C, Vilasi A, Fiume I, Tatè R, Capasso G. Employing extracellular vesicles for non-invasive renal monitoring: A captivating prospect. World J Clin Urol 2014; 3:66-80. [DOI: 10.5410/wjcu.v3.i2.66] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 06/09/2014] [Accepted: 06/27/2014] [Indexed: 02/06/2023] Open
Abstract
Extracellular vesicles (EVs) are fascinating nano-sized subjects extensively studied over the recent years across several disparate disciplines. EVs are endlessly secreted into the extracellular microenvironment by most cell types under physiological and pathological conditions. EVs encompass a variety of molecular constituents from their cell of origin, such as lipids, cell specific proteins and RNAs, thus constituting an informative resource for studying molecular events at the cellular level. There are three main classes of EVs classified based on their size, content, biogenesis and biological functions: exosomes, shedding microvesicles and apoptotic bodies. Besides cell culture supernatants, biological fluids have also been shown to contain different types of EVs. Amongst the various body fluids, the study of urinary extracellular vesicles (uEVs) as a source of candidate biomarkers gained much attention, since: (1) urine can be non-invasively collected in large amounts; and (2) the isolated uEVs are stable for a relatively long period of time. Here, we review the important aspects of urinary extracellular vesicles which are fast gaining attention as a promising future tool for the non-invasive monitoring of urinary tract. Recent advancements in the purification and analysis of uEVs and collection of their constituents in rapidly developing public databases, allow their better exploitation in molecular diagnostics. As a result, a growing number of studies have shown that changes in expression profile at the RNA and/or protein levels of uEVs reveal the molecular architectures of underlying key pathophysiological events of different clinically important diseases with kidney involvement.
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Salih M, Zietse R, Hoorn EJ. Urinary extracellular vesicles and the kidney: biomarkers and beyond. Am J Physiol Renal Physiol 2014; 306:F1251-9. [DOI: 10.1152/ajprenal.00128.2014] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Extracellular vesicles have been isolated in various body fluids, including urine. The cargo of urinary extracellular vesicles (uEVs) is composed of proteins and nucleic acids reflecting the physiological and possibly pathophysiological state of cells lining the nephron. Because urine is a noninvasive and readily available biofluid, the discovery of uEVs has opened a new field of biomarker research. Their potential use as diagnostic, prognostic, or therapeutic biomarkers for various kidney diseases, including glomerulonephritis, acute kidney injury, tubular disorders, and polycystic kidney disease, is currently being explored. Some challenges, however, remain. These challenges include the need to standardize isolation methods, normalization between samples, and validation of candidate biomarkers. Also, the development of a high-throughput platform to isolate and analyze uEVs, for example, an enzyme-linked immunosorbent assay, is desirable. Here, we review recent studies on uEVs dealing with kidney physiology and pathophysiology. Furthermore, we discuss new and exciting developments regarding vesicles, including their role in cell-to-cell communication and the possibility of using vesicles as a therapy for kidney disorders.
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Affiliation(s)
- Mahdi Salih
- Department of Internal Medicine, Nephrology and Transplantation, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Robert Zietse
- Department of Internal Medicine, Nephrology and Transplantation, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Ewout J. Hoorn
- Department of Internal Medicine, Nephrology and Transplantation, Erasmus Medical Center, Rotterdam, The Netherlands
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A compendium of urinary biomarkers indicative of glomerular podocytopathy. PATHOLOGY RESEARCH INTERNATIONAL 2013; 2013:782395. [PMID: 24327929 PMCID: PMC3845336 DOI: 10.1155/2013/782395] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 09/10/2013] [Indexed: 12/18/2022]
Abstract
It is well known that glomerular podocyte injury and loss are present in numerous nephropathies and that the pathophysiologic consecution of disease hinges upon the fate of the podocyte. While multiple factors play a hand in glomerulopathy progression, basic logic lends that if one monitors the podocyte's status, that may reflect the status of disease. Recent investigations have focused on what one can elucidate from the noninvasive collection of urine, and have proven that certain, specific biomarkers of podocytes can be readily identified via varying techniques. This paper has brought together all described urinary biomarkers of podocyte injury and is made to provide a concise summary of their utility and testing in laboratory and clinical theatres. While promising in the potential that they hold as tools for clinicians and investigators, the described biomarkers require further comprehensive vetting in the form of larger clinical trials and studies that would give their value true weight. These urinary biomarkers are put forth as novel indicators of glomerular disease presence, disease progression, and therapeutic efficacy that in some cases may be more advantageous than the established parameters/measures currently used in practice.
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Subfractionation, characterization, and in-depth proteomic analysis of glomerular membrane vesicles in human urine. Kidney Int 2013; 85:1225-37. [PMID: 24196483 PMCID: PMC4008663 DOI: 10.1038/ki.2013.422] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 08/26/2013] [Accepted: 08/29/2013] [Indexed: 01/15/2023]
Abstract
Urinary exosome-like vesicles (ELVs) are a heterogenous mixture (diameter 40–200nm) containing vesicles shed from all segments of the nephron including glomerular podocytes. Contamination with Tamm Horsfall protein (THP) oligomers has hampered their isolation and proteomic analysis. Here we improved ELV isolation protocols employing density centrifugation to remove THP and albumin, and isolated a glomerular membranous vesicle (GMV) enriched subfraction from 7 individuals identifying 1830 proteins and in 3 patients with glomerular disease identifying 5657 unique proteins. The GMV fraction was composed of podocin/podocalyxin positive irregularly shaped membranous vesicles and podocin/podocalyxin negative classical exosomes. Ingenuity pathway analysis identified integrin, actin cytoskeleton and RhoGDI signaling in the top three canonical represented signaling pathways and 19 other proteins associated with inherited glomerular diseases. The GMVs are of podocyte origin and the density gradient technique allowed isolation in a reproducible manner. We show many nephrotic syndrome proteins, proteases and complement proteins involved in glomerular disease are in GMVs and some were shed in the disease state (nephrin, TRPC6 and INF2 and PLA2R). We calculated sample sizes required to identify new glomerular disease biomarkers, expand the ELV proteome and provide a reference proteome in a database that may prove useful in the search for biomarkers of glomerular disease.
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Kimura J, Ichii O, Otsuka S, Sasaki H, Hashimoto Y, Kon Y. Close relations between podocyte injuries and membranous proliferative glomerulonephritis in autoimmune murine models. Am J Nephrol 2013; 38:27-38. [PMID: 23817053 DOI: 10.1159/000353093] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 05/10/2013] [Indexed: 12/19/2022]
Abstract
BACKGROUND Membranous proliferative glomerulonephritis (MPGN) is a major primary cause of chronic kidney disease (CKD). Podocyte injury is crucial in the pathogenesis of glomerular disease with proteinuria, leading to CKD. To assess podocyte injuries in MPGN, the pathological features of spontaneous murine models were analyzed. METHODS The autoimmune-prone mice strains BXSB/MpJ-Yaa and B6.MRL-(D1Mit202-D1Mit403) were used as the MPGN models, and BXSB/MpJ-Yaa(+) and C57BL/6 were used as the respective controls. In addition to clinical parameters and glomerular histopathology, the protein and mRNA levels of podocyte functional markers were evaluated as indices for podocyte injuries. The relation between MPGN pathology and podocyte injuries was analyzed by statistical correlation. RESULTS Both models developed MPGN with albuminuria and elevated serum anti-double-strand DNA (dsDNA) antibody levels. BXSB/MpJ-Yaa and B6.MRL showed severe proliferative lesions with T and B cell infiltrations and membranous lesions with T cell infiltrations, respectively. Foot process effacement and microvillus-like structure formation were observed ultrastructurally in the podocytes of both MPGN models. Furthermore, both MPGN models showed a decrease in immune-positive areas of nephrin, podocin and synaptopodin in the glomerulus, and in the mRNA expression of Nphs1, Nphs2, Synpo, Actn4, Cd2ap, and Podxl in the isolated glomerulus. Significant negative correlations were detected between serum anti-dsDNA antibody levels and glomerular Nphs1 expression, and between urinary albumin-to-creatinine ratio and glomerular expression of Nphs1, Synpo, Actn4, Cd2ap, or Podxl. CONCLUSION MPGN models clearly developed podocyte injuries characterized by the decreased expression of podocyte functional markers with altered morphology. These data emphasized the importance of regulation of podocyte injuries in MPGN.
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Affiliation(s)
- Junpei Kimura
- Laboratory of Anatomy, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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Musante L, Saraswat M, Ravidà A, Byrne B, Holthofer H. Recovery of urinary nanovesicles from ultracentrifugation supernatants. Nephrol Dial Transplant 2013; 28:1425-1433. [DOI: 10.1093/ndt/gfs564] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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Kriz W, Shirato I, Nagata M, LeHir M, Lemley KV. The podocyte's response to stress: the enigma of foot process effacement. Am J Physiol Renal Physiol 2013; 304:F333-47. [DOI: 10.1152/ajprenal.00478.2012] [Citation(s) in RCA: 196] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Progressive loss of podocytes is the most frequent cause accounting for end-stage renal failure. Podocytes are complex, terminally differentiated cells incapable of replicating. Thus lost podocytes cannot be replaced by proliferation of neighboring undamaged cells. Moreover, podocytes occupy a unique position as epithelial cells, adhering to the glomerular basement membrane (GBM) only by their processes, whereas their cell bodies float within the filtrate in Bowman's space. This exposes podocytes to the danger of being lost by detachment as viable cells from the GBM. Indeed, podocytes are continually excreted as viable cells in the urine, and the rate of excretion dramatically increases in glomerular diseases. Given this situation, it is likely that evolution has developed particular mechanisms whereby podocytes resist cell detachment. Podocytes respond to stress and injury by undergoing tremendous changes in shape. Foot process effacement is the most prominent and, yet in some ways, the most enigmatic of those changes. This review summarizes the various structural responses of podocytes to injury, focusing on foot process effacement and detachment. We raise the hypothesis that foot process effacement represents a protective response of podocytes to escape detachment from the GBM.
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Affiliation(s)
- Wilhelm Kriz
- Centre for Biomedicine and Medical Technology Mannheim (CBTM), Anatomy and Developmental Biology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Isao Shirato
- Division of Nephrology, Department of Internal Medicine, Juntendo University, School of Medicine, Tokyo, Japan
| | - Michio Nagata
- Kidney and Vascular Pathology, Faculty of Medicine, University of Tsukuba, Tsukuba-City, Japan
| | - Michel LeHir
- Institute of Anatomy, University of Zurich, Zurich, Switzerland; and
| | - Kevin V. Lemley
- Division of Nephrology, Children's Hospital Los Angeles, Los Angeles, California
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Hara M, Yamagata K, Tomino Y, Saito A, Hirayama Y, Ogasawara S, Kurosawa H, Sekine S, Yan K. Urinary podocalyxin is an early marker for podocyte injury in patients with diabetes: establishment of a highly sensitive ELISA to detect urinary podocalyxin. Diabetologia 2012; 55:2913-9. [PMID: 22854890 PMCID: PMC3464371 DOI: 10.1007/s00125-012-2661-7] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 06/19/2012] [Indexed: 11/27/2022]
Abstract
AIMS/OBJECTIVE Nephropathy, a major complication of diabetes, is the leading cause of end-stage renal disease. Recent studies have demonstrated that podocyte injury is involved in the onset of and progression to renal insufficiency. Here, we describe a novel, highly sensitive ELISA for detecting urinary podocalyxin, a glycoconjugate on the podocyte apical surface that indicates podocyte injury, particularly in the early phase of diabetic nephropathy. METHODS Urine samples from patients with glomerular diseases (n = 142) and type 2 diabetes (n = 71) were used to quantify urinary podocalyxin by ELISA. Urine samples were obtained from 69 healthy controls for whom laboratory data were within normal values. Podocalyxin was detected in urine by immunofluorescence, immunoelectron microscopy and western blotting. RESULTS Morphologically, urinary podocalyxin was present as a vesicular structure; western blotting showed it as a positive band at 165-170 kDa. Levels of urinary podocalyxin were elevated in patients with various glomerular diseases and patients with diabetes. In patients with diabetes, urinary podocalyxin was higher than the cut-off value in 53.8% patients at the normoalbuminuric stage, 64.7% at the microalbuminuric stage and 66.7% at the macroalbuminuric stage. Positive correlations were observed between urinary podocalyxin levels and HbA(1c), urinary β(2) microglobulin, α(1) microglobulin and urinary N-acetyl-β-D-glucosaminidase, although urinary podocalyxin levels were not correlated with other laboratory markers such as blood pressure, lipid level, serum creatinine, estimated GFR or proteinuria. CONCLUSIONS/INTERPRETATION Urinary podocalyxin may be a useful biomarker for detecting early podocyte injury in patients with diabetes.
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Affiliation(s)
- M Hara
- Department of Pediatrics, Yoshida Hospital, Yoshida 32-14, Tsubame City, 959-0242 Niigata, Japan.
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Musante L, Saraswat M, Duriez E, Byrne B, Ravidà A, Domon B, Holthofer H. Biochemical and physical characterisation of urinary nanovesicles following CHAPS treatment. PLoS One 2012; 7:e37279. [PMID: 22808001 PMCID: PMC3395701 DOI: 10.1371/journal.pone.0037279] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Accepted: 04/16/2012] [Indexed: 01/30/2023] Open
Abstract
Urinary exosomes represent a precious source of potential biomarkers for disease biology. Currently, the methods for vesicle isolation are severely restricted by the tendency of vesicle entrapment, e.g. by the abundant Tamm-Horsfall protein (THP) polymers. Treatment by reducing agents such as dithiothreitol (DTT) releases entrapped vesicles, thus increasing the final yield. However, this harsh treatment can cause remodelling of all those proteins which feature extra-vesicular domains stabilized by internal disulfide bridges and have detrimental effects on their biological activity. In order to optimize exosomal yield, we explore two vesicle treatment protocols - dithiothreitol (DTT) and 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonic (CHAPS) - applied to the differential centrifugation protocol for exosomal vesicle isolation. The results show that CHAPS treatment does not affect vesicle morphology or exosomal marker distribution, thus eliminating most of THP interference. Moreover, the recovery and preservation of catalytic activity of two trans-membrane proteases, dipeptidyl peptidase IV and nephrilysin, was examined and found to be clearly superior after CHAPS treatment compared to DTT. Finally, proteomic profiling by mass spectrometry (MS) revealed that 76.2% of proteins recovered by CHAPS are common to those seen for DTT treatment, which illustrates underlining similarities between the two approaches. In conclusion, we provide a major improvement to currently-utilized urinary vesicle isolation strategies to allow recovery of urinary vesicles without the deleterious interference of abundant urinary proteins, while preserving typical protein folding and, consequently, the precious biological activity of urinary proteins which serve as valuable biomarkers.
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Affiliation(s)
- Luca Musante
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Mayank Saraswat
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Elodie Duriez
- Luxembourg Clinical Proteomics Center (LCP), CRP-Santé, Strassen, Luxembourg
| | - Barry Byrne
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Alessandra Ravidà
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Bruno Domon
- Luxembourg Clinical Proteomics Center (LCP), CRP-Santé, Strassen, Luxembourg
| | - Harry Holthofer
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
- * E-mail:
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Asao R, Asanuma K, Kodama F, Akiba-Takagi M, Nagai-Hosoe Y, Seki T, Takeda Y, Ohsawa I, Mano S, Matsuoka K, Kurosawa H, Ogasawara S, Hirayama Y, Sekine S, Horikoshi S, Hara M, Tomino Y. Relationships between levels of urinary podocalyxin, number of urinary podocytes, and histologic injury in adult patients with IgA nephropathy. Clin J Am Soc Nephrol 2012; 7:1385-93. [PMID: 22700887 DOI: 10.2215/cjn.08110811] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Podocalyxin (PCX) is present on the apical cell membrane of podocytes and is shed in urine from injured podocytes. Urinary podocalyxin (u-PCX) is associated with severity of active glomerular injury in patients with glomerular diseases. This study examined the relationship between number of urinary podocytes, levels of u-PCX, and glomerular injury in adults with IgA nephropathy (IgAN). DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Urine samples voided in the morning on the day of biopsy were obtained from 51 patients with IgAN (18 men and 33 women; mean age, 31 years). All renal biopsy specimens were analyzed histologically. Pathologic variables of IgAN were analyzed per Shigematsu classification, the Oxford classification of IgAN, and the Clinical Guidelines of IgAN in Japan. Levels of u-PCX were measured by sandwich ELISA. RESULTS Histologic analysis based on Shigematsu classification revealed a significant correlation between levels of u-PCX and severity of acute extracapillary abnormalities (r=0.72; P<0.001), but levels of urinary protein excretion did not correlate with acute glomerular abnormalities. Levels of urinary protein excretion in patients with segmental sclerosis (n=19) were higher than in patients without (n=22) (0.49 [interquartile range (IQR), 0.20-0.88] g/g creatinine versus 0.20 [IQR, 0.10-0.33] g/g creatinine; P<0.01). The number of urinary podocytes in patients with segmental sclerosis was higher than in patients without (1.05 [IQR, 0.41-1.67] per mg creatinine versus 0.28 [IQR, 0.10-0.66] per mg creatinine; P<0.01). CONCLUSIONS Levels of u-PCX and the number of urinary podocytes are associated with histologic abnormalities in adults with IgAN.
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Affiliation(s)
- Rin Asao
- Division of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
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van Balkom BW, Pisitkun T, Verhaar MC, Knepper MA. Exosomes and the kidney: prospects for diagnosis and therapy of renal diseases. Kidney Int 2011; 80:1138-45. [PMID: 21881557 PMCID: PMC3412193 DOI: 10.1038/ki.2011.292] [Citation(s) in RCA: 160] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 06/09/2011] [Accepted: 06/14/2011] [Indexed: 12/11/2022]
Abstract
Exosomes are 40-100 nm membrane vesicles secreted into the extracellular space by numerous cell types. These structures can be isolated from body fluids including urine and plasma. Exosomes contain proteins, mRNAs, miRNAs, and signaling molecules that reflect the physiological state of their cells of origin and consequently provide a rich source of potential biomarker molecules. Aside from diagnostic uses, exosome-mediated transfer of proteins, mRNAs, miRNAs, and signaling molecules offer the promise that they may be used for therapeutic purposes. In this review, we integrate new knowledge about exosomes from outside the field of nephrology with recent progress by renal researchers in order to provide a basis for speculation about how the study of exosomes may affect the fields of nephrology and renal physiology in the next few years.
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Affiliation(s)
- Bas W.M. van Balkom
- Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Trairak Pisitkun
- Epithelial Systems Biology Laboratory, National Heart, Lung and Blood Institute, Bethesda, Maryland, USA
| | - Marianne C. Verhaar
- Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Mark A. Knepper
- Epithelial Systems Biology Laboratory, National Heart, Lung and Blood Institute, Bethesda, Maryland, USA
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Shimizu A, Higo S, Fujita E, Mii A, Kaneko T. Focal segmental glomerulosclerosis after renal transplantation. Clin Transplant 2011; 25 Suppl 23:6-14. [PMID: 21623907 DOI: 10.1111/j.1399-0012.2011.01452.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Focal segmental glomerulosclerosis (FSGS) is a clinicopathologic syndrome of proteinuria, usually of nephrotic range, associated with focal and segmental sclerotic glomerular lesions. Therefore, FSGS is diagnosed by clinical features and histopathological examination of renal biopsy. The natural history of the condition varies, and although it may respond to treatment, FSGS is an important disease in the etiology of end-stage renal disease (ESRD). Furthermore, after kidney transplantation, approximately 30% of patients with FSGS develop recurrent FSGS. The risk factors for recurrence of FSGS include childhood onset and age <15 yr, rapid progression of the primary FSGS to ESRD, recurrence of FSGS in a previous allograft, diffuse mesangial hypercellularity in the native kidney, collapsing FSGS, and podocin gene mutation. In addition, after kidney transplantation, de novo FSGS also develops in approximately 10-20% of allografts, associated with a complication of hyperfiltration injury, chronic transplant glomerulopathy, and calcineurin inhibitor toxicity. FSGS is considered a podocyte disease, and the pathology is characterized by segmental FSGS lesion with glomerular epithelial hypercellularity. The pathological diagnosis of FSGS is based on the 2004 Columbia classification system. In the present minireview, we discuss the pathology of recurrence and de novo FSGS after kidney transplantation.
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Affiliation(s)
- Akira Shimizu
- Department of Pathology (Analytic Human Pathology), Nippon Medical School, Tokyo, Japan.
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Selective albuminuria via podocyte albumin transport in puromycin nephrotic rats is attenuated by an inhibitor of NADPH oxidase. Kidney Int 2011; 80:1328-38. [PMID: 21849973 DOI: 10.1038/ki.2011.282] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The mechanism of selective albuminuria in minimal change nephrotic syndrome, in which glomerular capillaries are diffusely covered by effaced podocyte foot processes with reduced slit diaphragms, is unknown. Podocyte injury is due, in part, to NADPH-induced oxidative stress. Here we studied mechanism of selective albuminuria in puromycin aminonucleoside (PAN) nephrotic rats, a model of minimal change nephrotic syndrome. In these rats, Evans Blue-labeled human albumin was taken up by podocytes and its urinary excretion markedly increased, with retained selectivity for albumin. Immunogold scanning electron micrographic images found increased human albumin in podocyte vesicles and on the apical membrane in nephrotic compared with control rats. Apocynin, an inhibitor of NADPH oxidase, decreased superoxide production in podocytes, and inhibited endocytosis and urinary albumin excretion. Real-time confocal microscopy found an initial delay in the appearance of Evans Blue-labeled human albumin in the tubular lumen, reflecting the time needed for transcellular transport. Immunoprecipitation analysis indicated that FcRn, a receptor for albumin transport, mediated podocyte albumin transport, and treatment with anti-FcRn antibody reduced proteinuria in these nephrotic rats. Thus, podocyte albumin transport was enhanced in PAN nephrotic rats by means of FcRn, which may explain the mechanism of selective proteinuria. This was blocked by apocynin, suggesting a new therapeutic approach.
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