1
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Frémond ML, Crow YJ. STING-Mediated Lung Inflammation and Beyond. J Clin Immunol 2021; 41:501-514. [PMID: 33532887 DOI: 10.1007/s10875-021-00974-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 01/18/2021] [Indexed: 02/07/2023]
Abstract
Mendelian autoinflammatory diseases characterized by constitutive activation of the type I interferon pathway, the so-called type I interferonopathies, constitute a rapidly expanding group of inborn errors of immunity. Among the type I interferonopathies, STING-associated vasculopathy with onset in infancy (SAVI) and COPA syndrome were described in the last 6 years, both manifesting a major inflammatory lung component associated with significant morbidity and increased mortality. There is striking clinical and histopathological overlap between SAVI and COPA syndrome, although distinct features are also present. Of note, there is a remarkably high frequency of clinical non-penetrance among individuals harboring pathogenic COPA mutations. SAVI is caused by, principally heterozygous, gain-of-function mutations in STING1 (previously referred to as TMEM173) encoding STING, a key adaptor of the interferon signaling pathway induced by DNA. COPA syndrome results from heterozygous dominant-negative mutations in the coatomer protein subunit alpha, forming part of a complex involved in intracellular cargo protein transport between the Golgi and the endoplasmic reticulum (ER). Of importance, a role for COPA in regulating the trafficking of STING, an ER-resident protein which translocates to the Golgi during the process of its activation, was recently defined, thereby possibly explaining some aspects of the phenotypic overlap between SAVI and COPA syndrome. Here, we review the expanding phenotype of these diseases, highlighting common as well as specific features, and recent advances in our understanding of STING biology that have informed therapeutic decision-making in both conditions. Beyond these rare Mendelian disorders, DNA sensing through STING is likely relevant to the pathology of several diseases associated with lung inflammation, including systemic lupus erythematosus, dermatomyositis, environmental toxin exposure, and viral infection.
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Affiliation(s)
- Marie-Louise Frémond
- Université de Paris, Imagine Institute, Laboratory of Neurogenetics and Neuroinflammation, 24 boulevard du Montparnasse, F-75015, Paris, France. .,Paediatric Haematology-Immunology and Rheumatology Unit, AP-HP, Necker Hospital, F-75015, Paris, France.
| | - Yanick J Crow
- Université de Paris, Imagine Institute, Laboratory of Neurogenetics and Neuroinflammation, 24 boulevard du Montparnasse, F-75015, Paris, France.,Centre for Genomic and Experimental Medicine, Medical Research Council Institute of Genetics and Molecular Medicine, Edinburgh, UK
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2
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Bernard I, Limonta D, Mahal LK, Hobman TC. Endothelium Infection and Dysregulation by SARS-CoV-2: Evidence and Caveats in COVID-19. Viruses 2020; 13:E29. [PMID: 33375371 PMCID: PMC7823949 DOI: 10.3390/v13010029] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 12/16/2020] [Accepted: 12/25/2020] [Indexed: 02/06/2023] Open
Abstract
The ongoing pandemic of coronavirus disease 2019 (COVID-19) caused by the acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) poses a persistent threat to global public health. Although primarily a respiratory illness, extrapulmonary manifestations of COVID-19 include gastrointestinal, cardiovascular, renal and neurological diseases. Recent studies suggest that dysfunction of the endothelium during COVID-19 may exacerbate these deleterious events by inciting inflammatory and microvascular thrombotic processes. Although controversial, there is evidence that SARS-CoV-2 may infect endothelial cells by binding to the angiotensin-converting enzyme 2 (ACE2) cellular receptor using the viral Spike protein. In this review, we explore current insights into the relationship between SARS-CoV-2 infection, endothelial dysfunction due to ACE2 downregulation, and deleterious pulmonary and extra-pulmonary immunothrombotic complications in severe COVID-19. We also discuss preclinical and clinical development of therapeutic agents targeting SARS-CoV-2-mediated endothelial dysfunction. Finally, we present evidence of SARS-CoV-2 replication in primary human lung and cardiac microvascular endothelial cells. Accordingly, in striving to understand the parameters that lead to severe disease in COVID-19 patients, it is important to consider how direct infection of endothelial cells by SARS-CoV-2 may contribute to this process.
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Affiliation(s)
- Isabelle Bernard
- Department of Medical Microbiology & Immunology, University of Alberta, Edmonton, AB T6G 2E1, Canada;
| | - Daniel Limonta
- Department of Cell Biology, University of Alberta, Edmonton, AB T6G 2H7, Canada;
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB T6G 2E1, Canada
| | - Lara K. Mahal
- Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada;
| | - Tom C. Hobman
- Department of Medical Microbiology & Immunology, University of Alberta, Edmonton, AB T6G 2E1, Canada;
- Department of Cell Biology, University of Alberta, Edmonton, AB T6G 2H7, Canada;
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB T6G 2E1, Canada
- Women & Children’s Health Research Institute, University of Alberta, Edmonton, AB T6G 1C9, Canada
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3
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Farouk SS, Fiaccadori E, Cravedi P, Campbell KN. COVID-19 and the kidney: what we think we know so far and what we don't. J Nephrol 2020; 33:1213-1218. [PMID: 32691342 PMCID: PMC7370875 DOI: 10.1007/s40620-020-00789-y] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 06/20/2020] [Indexed: 12/24/2022]
Abstract
The novel coronavirus disease infection (COVID-19) outbreak that was declared a global pandemic in March 2020 had led to an internationally variable but concerning incidence of COVID-associated acute kidney injury (AKI), with prevalence reported as high as 46% in large cohorts of hospitalized patients. Variability in AKI may be explained by differences in traditional risk factors for AKI, heterogeneity among patient cohorts, and differences in racial and ethnic groups. Further, AKI requiring kidney replacement therapies (KRT) has been associated with increased mortality. Proposed mechanisms of kidney injury include direct viral-induced tubular or glomerular injury, sepsis-associated AKI, and thrombotic disease. Kidney pathology include acute tubular injury, glomerular fibrin thrombi, pigmented tubular casts, and collapsing focal segmental glomerulosclerosis. "Viral-like" particles have been observed in renal samples at electron microscopy and viral RNA has been identified in both glomerular and tubular compartments of kidney specimens, but the link between viral presence and injury remain unclear. Though the link between AKI and poor outcomes is clear, prevalence and outcomes of COVID-19 in patients with chronic kidney disease and end stage kidney disease has not yet been reported. In patients on immunosuppression like those with kidney transplants or glomerular disease, COVID-19 has presented a management dilemma. Herein, we review the existing literature on kidney disease in COVID-19 and discuss what remains to be learned.
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Affiliation(s)
- Samira S Farouk
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, Box 1243, One Gustave L. Levy Place, 10029, New York, NY, USA
| | - Enrico Fiaccadori
- Acute and Chronic Renal Failure Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - Paolo Cravedi
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, Box 1243, One Gustave L. Levy Place, 10029, New York, NY, USA
| | - Kirk N Campbell
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, Box 1243, One Gustave L. Levy Place, 10029, New York, NY, USA.
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4
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Yamada M, Rastogi P, Ince D, Thayyil A, Adela Mansilla M, Smith RJH, Kuppachi S, Thomas CP. Minimal Change Disease With Nephrotic Syndrome Associated With Coronavirus Disease 2019 After Apolipoprotein L1 Risk Variant Kidney Transplant: A Case Report. Transplant Proc 2020; 52:2693-2697. [PMID: 32972761 PMCID: PMC7440148 DOI: 10.1016/j.transproceed.2020.08.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 08/18/2020] [Indexed: 02/07/2023]
Abstract
Kidney injury is a well-known complication in people with coronavirus disease 2019 (COVID-19). In kidney transplant recipients with COVID-19, presentation with nephrotic syndrome has not been well described. We report on a 49-year-old black female kidney transplant recipient who presented 25 years after transplant with clinical features of nephrotic syndrome following a diagnosis of COVID-19. Histologic examination showed acute tubular injury with unremarkable glomeruli on light microscopy and diffuse foot process effacement of podocytes on electron microscopy, consistent with minimal change-like podocyte injury. Apolipoprotein L1 (APOL1) genetic testing confirmed 2 high-risk APOL1 alleles in the kidney donor. We speculate that COVID-19-induced systemic or local cytokine release could serve as a second hit in the presence of APOL1 risk alleles and mediate a podocytopathy manifesting as nephrotic syndrome. The presented case with minimal change-like disease, occurring in the context of the donor high-risk APOL1 genotype, extends the spectrum of clinical manifestations in COVID-19-associated nephropathy.
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Affiliation(s)
- Masaaki Yamada
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa; VA Medical Center, Iowa City, Iowa
| | - Prerna Rastogi
- Department of Pathology, University of Iowa, Iowa City, Iowa
| | - Dilek Ince
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa
| | - Abdullah Thayyil
- Department of Pathology, East Carolina University, Greenville, North Carolina; Department of Pathology, Vidant Medical Center, Greenville, North Carolina
| | - M Adela Mansilla
- Iowa Institute of Human Genetics, University of Iowa, Iowa City, Iowa
| | - Richard J H Smith
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa; Iowa Institute of Human Genetics, University of Iowa, Iowa City, Iowa
| | - Sarat Kuppachi
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa.
| | - Christie P Thomas
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa; VA Medical Center, Iowa City, Iowa
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5
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Wynd E, Stewart A, Burke J. Focal segmental glomerulosclerosis associated with acute cytomegalovirus infection in a renal transplant. Pediatr Transplant 2019; 23:e13538. [PMID: 31271240 DOI: 10.1111/petr.13538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 01/06/2019] [Accepted: 06/08/2019] [Indexed: 12/21/2022]
Abstract
Focal segmental glomerulosclerosis (FSGS) occurring in association with cytomegalovirus (CMV) infection in a renal transplant patient with no previous history of FSGS has rarely been reported. We present a case of a 16-year-old renal transplant recipient who developed acute hepatitis, leukopenia, nephrotic syndrome, and progressive renal dysfunction in the setting of acute infection with CMV. The cytomegalovirus infection was successfully treated with IV ganciclovir followed by oral valganciclovir but renal function deterioration and massive proteinuria continued. Features of FSGS were found on two renal allograft biopsies. Plasmapheresis and cyclophosphamide treatment was instituted with no clear effect on disease progress.
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Affiliation(s)
- Elsa Wynd
- Department of Nephrology, Queensland Children's Hospital, Brisbane, Queensland, Australia
| | - Anne Stewart
- Department of Pathology, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
| | - John Burke
- Department of Nephrology, Queensland Children's Hospital, Brisbane, Queensland, Australia
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6
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Kfoury H, Mubarak M, Qannus AA, Alshareef M, Alharbi J, Alghurair H, Bin Omair A, Alshamlan N, Raddaoui L, Alkhalidi H. The histological spectrum of tubulo-reticular inclusion positive renal biopsies: a tertiary hospital experience and review of the literature. Ultrastruct Pathol 2018; 42:365-368. [PMID: 30019987 DOI: 10.1080/01913123.2018.1496215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
AIM To identify the underlying diseases with TRI-positive kidney biopsies, and describe the histological pattern and spectrum of TRI-positive kidney biopsies. METHODS A retrospective analysis of all patients' chart that underwent renal biopsy at King Saud University Medical City between 2012 and 2017 was done. Kidney biopsies that indicated a positive result for tubuloreticular inclusions (TRI's) on electron microscopy were reviewed and the underlying disease and histological pattern was extracted. RESULTS Of 1,473 native kidney biopsies reviewed, 96 (6.5%) were TRI-positive. Of the 96 TRI-positive kidney biopsies, 87 (90.6%) were TRI-positive lupus nephritis (LN); of which 10 (11.5%) were Class V, 49 (56.3%) were active LN, and 28 (32.2%) were inactive LN. The underlying diseases of the nine non-LN TRI-positive cases included diabetic nephropathy, connective tissue disorders, immune complex mediated Glomerulonephritis (GN), acute thrombotic microangiopathy, rhabdomyolysis, and Wegener's disease. CONCLUSION LN is a very common finding in TRI-positive kidney biopsies. Active LN and chronic LN are the more common classes of TRI-positive LN kidney biopsies, than pure membranous (Class V) LN. TRI positive kidney biopsies without LN are commonly found in diabetic nephropathy, connective tissue disorders and immune mediated GN's. This study highlights this finding in our patients cohort in opposition to what has been reported in the literature.
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Affiliation(s)
- Hala Kfoury
- a Pathology Department , King Saud University Medical City , Riyadh , Saudi Arabia
| | - Mohammed Mubarak
- b College of Medicine , King Saud University Medical City , Riyadh , Saudi Arabia
| | - Abd Assalam Qannus
- c Department of Internal Medicine , American University of Beirut Medical Center , Beirut , Lebanon
| | - Malak Alshareef
- b College of Medicine , King Saud University Medical City , Riyadh , Saudi Arabia
| | - Jwaher Alharbi
- b College of Medicine , King Saud University Medical City , Riyadh , Saudi Arabia
| | - Hadeel Alghurair
- b College of Medicine , King Saud University Medical City , Riyadh , Saudi Arabia
| | - Alanoud Bin Omair
- b College of Medicine , King Saud University Medical City , Riyadh , Saudi Arabia
| | - Najd Alshamlan
- d Pathology Department , King Faisal Specialist Hospital and Research Center , Riyadh , Saudi Arabia
| | - Lama Raddaoui
- d Pathology Department , King Faisal Specialist Hospital and Research Center , Riyadh , Saudi Arabia
| | - Hisham Alkhalidi
- a Pathology Department , King Saud University Medical City , Riyadh , Saudi Arabia
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Brealey JK, Cassidy J, Manavis J. An unusual pattern of peritubular capillary injury involving apoptosis in a renal transplant patient. Ultrastruct Pathol 2018; 42:323-332. [PMID: 29897310 DOI: 10.1080/01913123.2018.1484542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Microvascular injury is an important factor in renal allograft survival. Repeated episodes of endothelial injury from chronic antibody-mediated rejection typically manifest at the ultrastructural level as circumferential multilayering of remodeled glomerular basement membrane material and peritubular capillary basal lamina. In contrast to this typical pattern of microvascular injury, a renal transplantation case is presented in which focally dilated and multilayered segments of peritubular capillary basal lamina bearing lipid droplets were interspersed with ultrastructurally normal unilayered segments of basal lamina devoid of lipid droplets. Glomerular basement membranes were not affected by this process. The peak incidence of lipid droplets within the peritubular capillary walls coincided with a peak in apoptotic activity within the allograft. Lesser amounts of the same lipidic material were identified in the mesangial matrix and an arteriolar wall. Mesangial electron-dense deposits were detected at two weeks posttransplantation and their appearance coincided with elevated immunological activity in the glomeruli, as determined by immunofluorescence microscopy. The unusual ultrastructure and immunological activity observed in this case may reflect a process of impaired apoptotic clearance within the allograft. The six biopsies from a single patient are discussed in the setting of a highly sensitized renal transplant recipient who received prophylactic terminal complement blockade by eculizumab. The findings may be relevant to the study of apoptosis, efferocytosis, microvascular injury, eculizumab, rejection, lupus, and drug-related disease.
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Affiliation(s)
- John K Brealey
- a Department of Anatomical Pathology , SA Pathology , Adelaide , Australia
| | - John Cassidy
- b Department of Immunology , SA Pathology , Adelaide , Australia
| | - Jim Manavis
- c Department of Neuropathology , SA Pathology , Adelaide , Australia
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8
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Wen Y, Shah S, Campbell KN. Molecular Mechanisms of Proteinuria in Focal Segmental Glomerulosclerosis. Front Med (Lausanne) 2018; 5:98. [PMID: 29713631 PMCID: PMC5912003 DOI: 10.3389/fmed.2018.00098] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 03/26/2018] [Indexed: 01/01/2023] Open
Abstract
Focal segmental glomerulosclerosis (FSGS) is the most common primary glomerular disease resulting in end-stage renal disease in the USA and is increasing in prevalence worldwide. It is a diverse clinical entity with idiopathic, genetic, metabolic, infectious, and other causes that culminate in a characteristic histologic pattern of injury. Proteinuria is a hallmark of FSGS as well as other primary and secondary glomerular disorders. The magnitude of proteinuria at disease onset and during treatment has prognostic implications for renal survival as well as associated cardiovascular morbidity and mortality. Significant advances over the last two decades have shed light on the molecular architecture of the glomerular filtration barrier. The podocyte is the target cell for injury in FSGS. A growing list of disease-causing gene mutations encoding proteins that regulate podocyte survival and homeostasis has been identified in FSGS patients. Several pathogenic and regulatory pathways have been uncovered that result in proteinuria in rodent models and human FSGS. The recurrence of proteinuria and FSGS after kidney transplantation is supporting evidence for the role of a circulating permeability factor in disease pathogenesis. These advances reviewed herein have significant implications for disease classification and therapeutic drug development for FSGS.
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Affiliation(s)
- Yumeng Wen
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Sapna Shah
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Kirk N Campbell
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, United States
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9
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Patel AM, Zenenberg RD, Goldberg RJ. De novo CMV-associated collapsing focal segmental glomerulosclerosis in a kidney transplant recipient. Transpl Infect Dis 2018; 20:e12884. [DOI: 10.1111/tid.12884] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 01/21/2018] [Indexed: 11/27/2022]
Affiliation(s)
- Anup M. Patel
- Renal and Pancreas Transplant Division; Saint Barnabas Medical Center; Livingston NJ USA
| | | | - Ryan J. Goldberg
- Renal and Pancreas Transplant Division; Saint Barnabas Medical Center; Livingston NJ USA
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10
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Grèze C, Garrouste C, Kemeny JL, Philipponnet C, Aniort J, Heng AÉ. [Collapsing focal segmental glomerulosclerosis induced by cytomegalovirus: A case report]. Nephrol Ther 2017; 14:50-53. [PMID: 29191574 DOI: 10.1016/j.nephro.2017.06.002] [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: 02/16/2017] [Revised: 04/26/2017] [Accepted: 06/01/2017] [Indexed: 10/18/2022]
Abstract
Focal segmental glomerulosclerosis (FSGS) is a common cause of nephrotic syndrome in child and adult. The collapsing forms are of poor renal prognosis and are usually secondary to viral infections with, first and foremost, the human immunodeficiency virus. Among other viral etiologies, cytomegalovirus (CMV) is an uncommon cause. We report a case of a 32years-old patient with collapsing focal segmental glomerulosclerosis induced by cytomegalovirus with initial acute renal failure and proteinuria at 12.4g/24h. The treatment associated ganciclovir during 7days followed by valganciclovir during 14days and steroids at 1mg/kg/day. Renal function improved and proteinuria decreased with this treatment. Proteinuria increase again 3weeks after valganciclovir discontinuation while CMV Polymerase chain reaction (PCR) was positive. Therefore, valganciclovir has been resumed allowing renal function normalization and decrease in proteinuria to 4g/24h after negative CMVPCR assay after 15weeks. Anti-CMV therapy combined with steroids seems to provide a renal response in case of FSGS induced by CMV even if long-term prognosis stays uncertain.
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Affiliation(s)
- Clarisse Grèze
- Service de néphrologie, CHU Gabriel-Montpied, 58, rue Montalembert, BP 69, 63000 Clermont-Ferrand cedex, France.
| | - Cyril Garrouste
- Service de néphrologie, CHU Gabriel-Montpied, 58, rue Montalembert, BP 69, 63000 Clermont-Ferrand cedex, France
| | - Jean-Louis Kemeny
- Laboratoire d'anatomopathologie, CHU Gabriel-Montpied, 58, rue Montalembert, BP 69, 63000 Clermont-Ferrand cedex, France
| | - Carole Philipponnet
- Service de néphrologie, CHU Gabriel-Montpied, 58, rue Montalembert, BP 69, 63000 Clermont-Ferrand cedex, France
| | - Julien Aniort
- Service de néphrologie, CHU Gabriel-Montpied, 58, rue Montalembert, BP 69, 63000 Clermont-Ferrand cedex, France
| | - Anne-Élisabeth Heng
- Service de néphrologie, CHU Gabriel-Montpied, 58, rue Montalembert, BP 69, 63000 Clermont-Ferrand cedex, France
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11
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Lee JY, Song SH, Kim YS, Lim BJ, Kim SI, Kim MS, Jeong HJ. Tubuloreticular inclusions in peritubular capillaries of renal allografts. Pathol Res Pract 2017. [DOI: 10.1016/j.prp.2017.06.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Elmaghrabi A, Brown E, Khin E, Hassler J, Hendricks AR. Tubuloreticular Inclusions in the Absence of Systemic Lupus Erythematosus and HIV Infection: A Report of Three Pediatric Cases. Case Rep Nephrol Dial 2017; 7:91-101. [PMID: 28868299 PMCID: PMC5567081 DOI: 10.1159/000477661] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/21/2017] [Indexed: 11/19/2022] Open
Abstract
Tubuloreticular inclusions (TRIs) are subcellular structures located within the cisternae of endoplasmic reticulum. Formation of TRIs has been linked to the exposure of excess interferon (IFN), either from endogenous or exogenous sources. In renal disease, TRIs have been most commonly associated with systemic lupus erythematosus (SLE), and human immunodeficiency virus-associated nephropathy (HIVAN). Case reports of patients with renal biopsies showing TRIs without underlying SLE or HIV are infrequent in adults, and to our knowledge none have been reported in children. We report 3 pediatric cases in which the renal biopsy showed TRIs on electron microscopy without underlying SLE or HIV infection. The first patient presented at 2 years of age with nephrotic syndrome and renal failure. His renal biopsy revealed focal segmental glomerulosclerosis and TRIs. The second patient presented at 6 months of age with infantile nephrotic syndrome, and his renal biopsy revealed membranous glomerulopathy and TRIs. The last patient presented at 4 years of age with acute kidney injury of unclear etiology leading to chronic kidney disease. Her biopsy revealed acute and chronic tubulointerstitial nephritis with TRIs. Despite extensive evaluation in all 3 patients, including testing for HIV infection and SLE, we could not identify an underlying etiology to explain the presence of TRIs. In conclusion, renal biopsy with TRIs in the absence of underling SLE and HIV remains obscure. We propose a possible role for excess IFN triggered by an abnormal immune response to common viral infections in the formation of TRIs and renal injury.
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Affiliation(s)
- Ayah Elmaghrabi
- Children's Medical Center, Dallas, Texas, USA.,UT Southwestern Medical Center, Dallas, Texas, USA
| | - Elizabeth Brown
- Children's Medical Center, Dallas, Texas, USA.,UT Southwestern Medical Center, Dallas, Texas, USA
| | - Ei Khin
- Children's Medical Center, Dallas, Texas, USA.,UT Southwestern Medical Center, Dallas, Texas, USA
| | - Jared Hassler
- Children's Medical Center, Dallas, Texas, USA.,UT Southwestern Medical Center, Dallas, Texas, USA
| | - Allen R Hendricks
- Children's Medical Center, Dallas, Texas, USA.,UT Southwestern Medical Center, Dallas, Texas, USA
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13
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Dettmar AK, Oh J. Infection-Related Focal Segmental Glomerulosclerosis in Children. BIOMED RESEARCH INTERNATIONAL 2016; 2016:7351964. [PMID: 27294131 PMCID: PMC4886048 DOI: 10.1155/2016/7351964] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Revised: 04/07/2016] [Accepted: 04/21/2016] [Indexed: 01/16/2023]
Abstract
Focal segmental glomerulosclerosis (FSGS) is the most common cause of steroid resistant nephrotic syndrome in children. It describes a unique histological picture of glomerular damage resulting from several causes. In the majority of patients the causing agent is still unknown, but in some cases viral association is evident. In adults, the most established FSGS causing virus is the human immune-deficiency virus, which is related to a collapsing variant of FSGS. Nevertheless, other viruses are also suspected for causing a collapsing or noncollapsing variant, for example, hepatitis B virus, parvovirus B19, and Cytomegalovirus. Although the systemic infection mechanism is different for these viruses, there are similarities in the pathomechanism for the induction of FSGS. As the podocyte is the key structure in the pathogenesis of FSGS, a direct infection of these cells or immediate damage through the virus or viral components has to be considered. Although viral infections are a very rare cause for FSGS in children, the treating pediatric nephrologist has to be aware of a possible underlying infection, as this has a relevant impact on therapy and prognosis.
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Affiliation(s)
- Anne Katrin Dettmar
- Department of Pediatric Nephrology, University Children's Medical Clinic, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Jun Oh
- Department of Pediatric Nephrology, University Children's Medical Clinic, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
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14
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Brealey JK, Cassidy J. Electron-dense deposit in renal transplant patients on eculizumab may be drug-derived. Ultrastruct Pathol 2015; 40:2-6. [PMID: 26512451 DOI: 10.3109/01913123.2015.1090515] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Eculizumab is a monoclonal antibody that inhibits the conversion of complement protein C5 to C5a and C5b. Eculizumab has been used to treat some disorders of complement regulation owing to its ability to inhibit terminal complement activation. The efficacy of eculizumab in reducing complement-mediated microvascular injury in renal allografts is currently the subject of trials. Electron-dense deposit was detected in allograft biopsies from three highly sensitized recipients of renal transplants, all of whom had received prophylactic eculizumab therapy. In two cases, the deposit was probably drug-derived whilst in the third case the deposit was probably derived from recurrent disease. The cases demonstrate the potential difficulty in interpreting electron-dense deposit in renal allograft biopsies, particularly in the setting of eculizumab therapy.
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Affiliation(s)
- John K Brealey
- a Department of Anatomical Pathology , SA Pathology , Adelaide , Australia
| | - John Cassidy
- b Department of Human Immunology , SA Pathology , Adelaide , Australia
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