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Jepson RE, Cardwell JM, Cortellini S, Holm L, Stevens K, Walker D. Cutaneous and Renal Glomerular Vasculopathy: What Do We Know so Far? Vet Clin North Am Small Anim Pract 2019; 49:745-762. [PMID: 30961997 DOI: 10.1016/j.cvsm.2019.02.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Cutaneous renal glomerular vasculopathy (CRGV), colloquially named "Alabama rot," is an emerging condition in the United Kingdom, previously reported from the United States and Germany. The cause of CRGV is not yet determined; no definitive link to an infectious agent has been made. Dogs diagnosed with CRGV initially develop cutaneous lesions, and a proportion of these dogs go on to manifest acute kidney injury, which may result in oligoanuric acute renal failure. Antemortem diagnosis is challenging given the lack of a specific diagnostic test, and confirmation of CRGV is therefore currently dependent on identification of thrombotic microangiopathy on renal histopathology.
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Affiliation(s)
- Rosanne E Jepson
- Department of Clinical Science and Services, Royal Veterinary College, Queen Mother Hospital for Animals, Hawkshead Lane, North Mymms, Herts, London AL9 7TA, UK.
| | - Jacqueline M Cardwell
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Herts, London AL9 7TA, UK
| | - Stefano Cortellini
- Department of Clinical Science and Services, Royal Veterinary College, Queen Mother Hospital for Animals, Hawkshead Lane, North Mymms, Herts, London AL9 7TA, UK
| | - Laura Holm
- Anderson Moores Veterinary Specialists, The Granary, Bunstead Barns, Poles Lane, Hursley, Winchester SO21 2LL, UK
| | - Kim Stevens
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Herts, London AL9 7TA, UK
| | - David Walker
- Anderson Moores Veterinary Specialists, The Granary, Bunstead Barns, Poles Lane, Hursley, Winchester SO21 2LL, UK
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Frémeaux-Bacchi V, Sellier-Leclerc AL, Vieira-Martins P, Limou S, Kwon T, Lahoche A, Novo R, Llanas B, Nobili F, Roussey G, Cailliez M, Ulinski T, Deschênes G, Alberti C, Weill FX, Mariani P, Loirat C. Complement Gene Variants and Shiga Toxin-Producing Escherichia coli-Associated Hemolytic Uremic Syndrome: Retrospective Genetic and Clinical Study. Clin J Am Soc Nephrol 2019; 14:364-377. [PMID: 30674459 PMCID: PMC6419292 DOI: 10.2215/cjn.05830518] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 12/04/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND OBJECTIVES Inherited complement hyperactivation is critical for the pathogenesis of atypical hemolytic uremic syndrome (HUS) but undetermined in postdiarrheal HUS. Our aim was to investigate complement activation and variants of complement genes, and their association with disease severity in children with Shiga toxin-associated HUS. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Determination of complement biomarkers levels and next-generation sequencing for the six susceptibility genes for atypical HUS were performed in 108 children with a clinical diagnosis of post-diarrheal HUS (75 Shiga toxin-positive, and 33 Shiga toxin-negative) and 80 French controls. As an independent control cohort, we analyzed the genotypes in 503 European individuals from the 1000 Genomes Project. RESULTS During the acute phase of HUS, plasma levels of C3 and sC5b-9 were increased, and half of patients had decreased membrane cofactor protein expression, which normalized after 2 weeks. Variants with minor allele frequency <1% were identified in 12 Shiga toxin-positive patients with HUS (12 out of 75, 16%), including pathogenic variants in four (four out of 75, 5%), with no significant differences compared with Shiga toxin-negative patients with HUS and controls. Pathogenic variants with minor allele frequency <0.1% were found in three Shiga toxin-positive patients with HUS (three out of 75, 4%) versus only four European controls (four out of 503, 0.8%) (odds ratio, 5.2; 95% confidence interval, 1.1 to 24; P=0.03). The genetic background did not significantly affect dialysis requirement, neurologic manifestations, and sC5b-9 level during the acute phase, and incident CKD during follow-up. However, the only patient who progressed to ESKD within 3 years carried a factor H pathogenic variant. CONCLUSIONS Rare variants and complement activation biomarkers were not associated with severity of Shiga toxin-associated HUS. Only pathogenic variants with minor allele frequency <0.1% are more frequent in Shiga toxin-positive patients with HUS than in controls.
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Affiliation(s)
- Véronique Frémeaux-Bacchi
- Service d’Immunologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris, Paris, France
- Team “Complement and Disease,” Centre de recherche des Cordeliers, Sorbonne Université, INSERM, Paris, France
| | | | - Paula Vieira-Martins
- Service d’Immunologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Sophie Limou
- Institute for Transplantation in Urology and Nephrology, Centre Hospitalo-Universitaire de Nantes, Centre de Recherche en Transplantation et Immunologie, Institut National de la Santé et de la Recherche Médicale U1064, Université de Nantes, Ecole Centrale de Nantes, Nantes, France
| | | | - Annie Lahoche
- Pediatric Nephrology Department, Hôpital Jeanne de Flandre, Centre Hospitalo-Universitaire de Lille, Lille, France
| | - Robert Novo
- Pediatric Nephrology Department, Hôpital Jeanne de Flandre, Centre Hospitalo-Universitaire de Lille, Lille, France
| | - Brigitte Llanas
- Pediatric Nephrology Department, Centre Hospitalo-Universitaire de Bordeaux, Bordeaux, France
| | - François Nobili
- Pediatric Nephrology Department, Centre Hospitalo-Universitaire de Besançon, Besançon, France
| | - Gwenaëlle Roussey
- Pediatric Nephrology Department, Centre Hospitalo-Universitaire de Nantes, Nantes, France
| | - Mathilde Cailliez
- Pediatric Nephrology Department, Centre Hospitalo-Universitaire de Marseille, Marseille, France
| | - Tim Ulinski
- Pediatric Nephrology Department, Hôpital Trousseau, University Pierre and Marie Curie, Assistance Publique-Hôpitaux de Paris, Paris, France; and
| | | | - Corinne Alberti
- Unit of Clinical Epidemiology, Institut National de la Santé et de la Recherche Médicale U1123 and Centre d'Investigation Clinique-Epidémiologie Clinique 1426, and
| | - François-Xavier Weill
- Institut Pasteur, Unité des Bactéries Pathogènes Entériques, Centre National de Référence des Escherichia coli, Shigella et Salmonella, Paris, France
| | - Patricia Mariani
- Laboratory of Microbiology, Escherichia coli Associated National Reference Center, Hôpital Robert Debré, University Paris Diderot, Assistance Publique-Hôpitaux de Paris, Paris, France
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3
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Acute kidney injury in a patient with hemolytic anemia and thrombocytopenia. JAAPA 2018; 29:1-4. [PMID: 27787280 DOI: 10.1097/01.jaa.0000496961.12367.e2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Atypical hemolytic uremic syndrome (HUS) is clinically difficult to distinguish from HUS and thrombotic thrombocytopenic purpura. Atypical HUS results from dysregulation of complement activation causing thrombotic microangiopathy affecting multiple organ systems. Atypical HUS is associated with high morbidity and mortality, making early recognition and appropriate therapy necessary to improve patient outcomes.
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4
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Westra D, Volokhina EB, van der Molen RG, van der Velden TJAM, Jeronimus-Klaasen A, Goertz J, Gracchi V, Dorresteijn EM, Bouts AHM, Keijzer-Veen MG, van Wijk JAE, Bakker JA, Roos A, van den Heuvel LP, van de Kar NCAJ. Serological and genetic complement alterations in infection-induced and complement-mediated hemolytic uremic syndrome. Pediatr Nephrol 2017; 32:297-309. [PMID: 27718086 PMCID: PMC5203860 DOI: 10.1007/s00467-016-3496-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 08/10/2016] [Accepted: 08/11/2016] [Indexed: 01/13/2023]
Abstract
BACKGROUND The role of complement in the atypical form of hemolytic uremic syndrome (aHUS) has been investigated extensively in recent years. As the HUS-associated bacteria Shiga-toxin-producing Escherichia coli (STEC) can evade the complement system, we hypothesized that complement dysregulation is also important in infection-induced HUS. METHODS Serological profiles (C3, FH, FI, AP activity, C3d, C3bBbP, C3b/c, TCC, αFH) and genetic profiles (CFH, CFI, CD46, CFB, C3) of the alternative complement pathway were prospectively determined in the acute and convalescent phase of disease in children newly diagnosed with STEC-HUS or aHUS. Serological profiles were compared with those of 90 age-matched controls. RESULTS Thirty-seven patients were studied (26 STEC-HUS, 11 aHUS). In 39 % of them, including 28 % of STEC-HUS patients, we identified a genetic and/or acquired complement abnormality. In all patient groups, the levels of investigated alternative pathway (AP) activation markers were elevated in the acute phase and normalized in remission. The levels were significantly higher in aHUS than in STEC-HUS patients. CONCLUSIONS In both infection-induced HUS and aHUS patients, complement is activated in the acute phase of the disease but not during remission. The C3d/C3 ratio displayed the best discrepancy between acute and convalescent phase and between STEC-HUS and aHUS and might therefore be used as a biomarker in disease diagnosis and monitoring. The presence of aberrations in the alternative complement pathway in STEC-HUS patients was remarkable, as well.
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Affiliation(s)
- Dineke Westra
- Department of Pediatric Nephrology (804), Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands.
| | - Elena B Volokhina
- Department of Pediatric Nephrology (804), Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
| | - Renate G van der Molen
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Thea J A M van der Velden
- Department of Pediatric Nephrology (804), Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
| | - Annelies Jeronimus-Klaasen
- Department of Pediatric Nephrology (804), Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
| | - Joop Goertz
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Valentina Gracchi
- Department of Pediatric Nephrology, University Medical Center Groningen, Groningen, The Netherlands
| | - Eiske M Dorresteijn
- Department of Pediatric Nephrology, Erasmus MC - Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Antonia H M Bouts
- Department of Pediatric Nephrology, Academic Medical Center, Amsterdam, The Netherlands
| | - Mandy G Keijzer-Veen
- Department of Pediatric Nephrology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Joanna A E van Wijk
- Department of Pediatric Nephrology, VU University Medical Center, Amsterdam, The Netherlands
| | - Jaap A Bakker
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Centre, Leiden, The Netherlands
| | - Anja Roos
- Department of Medical Microbiology and Immunology, Sint Antonius Hospital, Nieuwegein, The Netherlands
| | - Lambert P van den Heuvel
- Department of Pediatric Nephrology (804), Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
- Department of Pediatrics, Department of Growth and Regeneration, University Hospital Leuven, Leuven, Belgium
| | - Nicole C A J van de Kar
- Department of Pediatric Nephrology (804), Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
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Abstract
Post-infectious hemolytic uremic syndrome (HUS) is caused by specific pathogens in patients with no identifiable HUS-associated genetic mutation or autoantibody. The majority of episodes is due to infections by Shiga toxin (Stx) producing Escherichia coli (STEC). This chapter reviews the epidemiology and pathogenesis of STEC-HUS, including bacterial-derived factors and host responses. STEC disease is characterized by hematological (microangiopathic hemolytic anemia), renal (acute kidney injury) and extrarenal organ involvement. Clinicians should always strive for an etiological diagnosis through the microbiological or molecular identification of Stx-producing bacteria and Stx or, if negative, serological assays. Treatment of STEC-HUS is supportive; more investigations are needed to evaluate the efficacy of putative preventive and therapeutic measures, such as non-phage-inducing antibiotics, volume expansion and anti-complement agents. The outcome of STEC-HUS is generally favorable, but chronic kidney disease, permanent extrarenal, mainly cerebral complication and death (in less than 5 %) occur and long-term follow-up is recommended. The remainder of this chapter highlights rarer forms of (post-infectious) HUS due to S. dysenteriae, S. pneumoniae, influenza A and HIV and discusses potential interactions between these pathogens and the complement system.
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Affiliation(s)
- Denis F. Geary
- Division of Nephrology, The Hospital for Sick Children, Toronto, Ontario Canada
| | - Franz Schaefer
- Division of Pediatric Nephrology, University of Heidelberg, Heidelberg, Germany
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Nester CM, Barbour T, de Cordoba SR, Dragon-Durey MA, Fremeaux-Bacchi V, Goodship THJ, Kavanagh D, Noris M, Pickering M, Sanchez-Corral P, Skerka C, Zipfel P, Smith RJH. Atypical aHUS: State of the art. Mol Immunol 2015; 67:31-42. [PMID: 25843230 DOI: 10.1016/j.molimm.2015.03.246] [Citation(s) in RCA: 194] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 03/11/2015] [Accepted: 03/12/2015] [Indexed: 12/12/2022]
Abstract
Tremendous advances in our understanding of the thrombotic microangiopathies (TMAs) have revealed distinct disease mechanisms within this heterogeneous group of diseases. As a direct result of this knowledge, both children and adults with complement-mediated TMA now enjoy higher expectations for long-term health. In this update on atypical hemolytic uremic syndrome, we review the clinical characteristics; the genetic and acquired drivers of disease; the broad spectrum of environmental triggers; and current diagnosis and treatment options. Many questions remain to be addressed if additional improvements in patient care and outcome are to be achieved in the coming decade.
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Affiliation(s)
- Carla M Nester
- Molecular Otolaryngology and Renal Research Laboratories, Carver College of Medicine, University of Iowa, Iowa City, IA, USA; Division of Nephrology, Stead Family Department of Pediatrics, Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Thomas Barbour
- Centre for Complement and Inflammation Research, Department of Medicine, Imperial College, London W12 0NN, UK
| | | | - Marie Agnes Dragon-Durey
- Assistance Publique - Hopitaux de Paris, Service d'Immunologie Biologique, Hopital Europeen Georges Pompidou, Paris, France
| | - Veronique Fremeaux-Bacchi
- Assistance Publique - Hopitaux de Paris, Service d'Immunologie Biologique, Hopital Europeen Georges Pompidou, Paris, France
| | - Tim H J Goodship
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - David Kavanagh
- Assistance Publique - Hopitaux de Paris, Service d'Immunologie Biologique, Hopital Europeen Georges Pompidou, Paris, France
| | - Marina Noris
- IRCCS - Istituto di Ricerche Farmacologiche "Mario Negri", Clinical Research Center for Rare Diseases "Aldo e Cele Daccò", Ranica, Bergamo, Italy
| | - Matthew Pickering
- Centre for Complement and Inflammation Research, Department of Medicine, Imperial College, London W12 0NN, UK
| | - Pilar Sanchez-Corral
- Unidad de Investigación and Ciber de Enfermedades Raras, Hospital Universitario de La Paz_IdiPAZ, Paseo de la Castellana 261, 28046 Madrid, Spain
| | - Christine Skerka
- Leibniz Institute for Natural Product Research and Infection Biology, Jena, Germany
| | - Peter Zipfel
- Leibniz Institute for Natural Product Research and Infection Biology, Jena, Germany; Friedrich Schiller University, Jena, Germany
| | - Richard J H Smith
- Molecular Otolaryngology and Renal Research Laboratories, Carver College of Medicine, University of Iowa, Iowa City, IA, USA; Division of Nephrology, Stead Family Department of Pediatrics, Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.
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7
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Syndrome hémolytique et urémique atypique : pour qui l’éculizumab ? MEDECINE INTENSIVE REANIMATION 2014. [DOI: 10.1007/s13546-014-0928-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Abstract
Hemolytic uremic syndrome (HUS) is a triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute renal failure. The atypical form of HUS is a disease characterized by complement overactivation. Inherited defects in complement genes and acquired autoantibodies against complement regulatory proteins have been described. Incomplete penetrance of mutations in all predisposing genes is reported, suggesting that a precipitating event or trigger is required to unmask the complement regulatory deficiency. The underlying genetic defect predicts the prognosis both in native kidneys and after renal transplantation. The successful trials of the complement inhibitor eculizumab in the treatment of atypical HUS will revolutionize disease management.
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Affiliation(s)
- David Kavanagh
- The Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK.
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9
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Wong EKS, Goodship THJ, Kavanagh D. Complement therapy in atypical haemolytic uraemic syndrome (aHUS). Mol Immunol 2013; 56:199-212. [PMID: 23810412 PMCID: PMC3899040 DOI: 10.1016/j.molimm.2013.05.224] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Accepted: 05/10/2013] [Indexed: 12/22/2022]
Abstract
Central to the pathogenesis of atypical haemolytic uraemic syndrome (aHUS) is over-activation of the alternative pathway of complement. Inherited defects in complement genes and autoantibodies against complement regulatory proteins have been described. The use of plasma exchange to replace non-functioning complement regulators and hyper-functional complement components in addition to the removal of CFH-autoantibodies made this the ‘gold-standard’ for management of aHUS. In the last 4 years the introduction of the complement inhibitor Eculizumab has revolutionised the management of aHUS. In this review we shall discuss the available literature on treatment strategies to date.
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Affiliation(s)
- Edwin K S Wong
- The Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
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10
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Barbour T, Johnson S, Cohney S, Hughes P. Thrombotic microangiopathy and associated renal disorders. Nephrol Dial Transplant 2012; 27:2673-85. [PMID: 22802583 PMCID: PMC3398067 DOI: 10.1093/ndt/gfs279] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Accepted: 04/07/2012] [Indexed: 12/17/2022] Open
Abstract
Thrombotic microangiopathy (TMA) is a pathological process involving thrombocytopenia, microangiopathic haemolytic anaemia and microvascular occlusion. TMA is common to haemolytic uraemic syndrome (HUS) associated with shiga toxin or invasive pneumococcal infection, atypical HUS (aHUS), thrombotic thrombocytopenic purpura (TTP) and other disorders including malignant hypertension. HUS complicating infection with shiga toxin-producing Escherichia coli (STEC) is a significant cause of acute renal failure in children worldwide, occurring sporadically or in epidemics. Studies in aHUS have revealed genetic and acquired factors leading to dysregulation of the alternative complement pathway. TTP has been linked to reduced activity of the ADAMTS13 cleaving protease (typically with an autoantibody to ADAMTS13) with consequent disruption of von Willebrand factor multimer processing. However, the convergence of pathogenic pathways and clinical overlap create diagnostic uncertainty, especially at initial presentation. Furthermore, recent developments are challenging established management protocols. This review addresses the current understanding of molecular mechanisms underlying TMA, relating these to clinical presentation with an emphasis on renal manifestations. A diagnostic and therapeutic approach is presented, based on international guidelines, disease registries and published trials. Early treatment remains largely empirical, consisting of plasma replacement/exchange with the exception of childhood STEC-HUS or pneumococcal sepsis. Emerging therapies such as the complement C5 inhibitor eculizumab for aHUS and rituximab for TTP are discussed, as is renal transplantation for those patients who become dialysis-dependent as a result of aHUS.
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Affiliation(s)
- Thomas Barbour
- Imperial College, Centre for Complement and Inflammation Research, London, UK.
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Goonewardene M, Shehata M, Hamad A. Anaemia in pregnancy. Best Pract Res Clin Obstet Gynaecol 2011; 26:3-24. [PMID: 22138002 DOI: 10.1016/j.bpobgyn.2011.10.010] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Revised: 10/19/2011] [Accepted: 10/19/2011] [Indexed: 11/16/2022]
Abstract
Anaemia in pregnancy, defined as a haemoglobin concentration (Hb) < 110 g/L, affects more than 56 million women globally, two thirds of them being from Asia. Multiple factors lead to anaemia in pregnancy, nutritional iron deficiency anaemia (IDA) being the commonest. Underlying inflammatory conditions, physiological haemodilution and several factors affecting Hb and iron status in pregnancy lead to difficulties in establishing a definitive diagnosis. IDA is associated with increased maternal and perinatal morbidity and mortality, and long-term adverse effects in the new born. Strategies to prevent anaemia in pregnancy and its adverse effects include treatment of underlying conditions, iron and folate supplementation given weekly for all menstruating women including adolescents and daily for women during pregnancy and the post partum period, and delayed clamping of the umbilical cord at delivery. Oral iron is preferable to intravenous therapy for treatment of IDA. B12 and folate deficiencies in pregnancy are rare and may be due to inadequate dietary intake with the latter being more common. These vitamins play an important role in embryo genesis and hence any relative deficiencies may result in congenital abnormalities. Finding the underlying cause are crucial to the management of these deficiencies. Haemolytic anaemias rare also rare in pregnancy, but may have life-threatening complications if the diagnosis is not made in good time and acted upon appropriately.
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Affiliation(s)
- Malik Goonewardene
- Department of Obstetrics and Gynaecology, University of Ruhuna, Faculty of Medicine, Galle, Sri Lanka.
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12
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Frémeaux-Bacchi V, Fakhouri F, Roumenina L, Dragon-Durey MA, Loirat C. [Atypical hemolytic-uremic syndrome related to abnormalities within the complement system]. Rev Med Interne 2011; 32:232-40. [PMID: 21376430 DOI: 10.1016/j.revmed.2009.09.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2009] [Accepted: 09/19/2009] [Indexed: 12/25/2022]
Abstract
Hemolytic uremic syndrome (HUS) is a thrombotic microangiopathy (TMA) disorder characterised by the association of haemolytic anaemia, thrombocytopenia and acute renal failure. Atypical forms (non-shigatoxin related forms) may be familial or sporadic, frequently with relapses and most of them lead to end stage renal failure. During the last years, different groups have demonstrated genetic predisposition to atypical HUS (aHUS) involving five genes encoding for complement components which play a role in the activation or control of the alternative pathway: encoding factor H (CFH), accounting for 30% of aHUS; CD46 (encoding membrane cofactor protein [MCP]) accounting for approximately 10% of aHUS; CFI (encoding factor I) accounting for an estimated 5-15% of patients; C3 (encoding C3) accounting for approximately 10% of aHUS; and rarely CFB (encoding factor B). Predisposition to aHUS is inherited with incomplete penetrance. It is admitted that mutations confer a predisposition to develop aHUS rather than directly causing the disease and that a second event (genetic or environmental) is required for disease manifestation. HUS onset follows a triggering event in most cases (frequently banal seasonal infection and pregnancy). Uncontrolled C3 convertase leads to increased deposition of C3b on vascular endothelium and participates to the prothrombotic state. The phenotype of aHUS is variable ranging from mild forms, with complete recovery of renal function to severe forms with end stage renal disease within the first year after the onset. Overall, the outcome is severe with a mortality rate of 10% and with more than 60% of patients on dialysis. The most severe prognosis was in the CFH mutation group. There is a high risk of recurrence of the disease after renal transplantation in patients with mutations in CFH, CFI, CFB and C3. Plasma therapy may allow complete haematological remission but frequently with persistent renal damage. Some patients are plasma resistant and some are plasma dependent. The recent progress in the determination of the susceptibility factors for aHUS, have allowed to propose new diagnostic tests including a molecular genetic testing and may permit to consider some new specific treatments in this disease (human plasma-derived CFH or complement inhibitors).
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Affiliation(s)
- V Frémeaux-Bacchi
- Service d'immunologie biologique, hôpital Européen Georges-Pompidou, Assistance publique-Hôpitaux de Paris, 20-40, rue Leblanc, 75908 Paris cedex 15, France.
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Habibi I, Sfar I, Ben Alaya W, Methlouthi J, Ayadi A, Brahim M, Blouin J, Dhagbouj R, Ben Rhomdhane T, Makhlouf M, Aouadi H, Ayed-Jendoubi S, Fremeaux-Bacchi V, Sfar T, Ben Abdallah T, Ayed K, Gorgi Y. Atypical hemolytic uremic syndrome and mutation analysis of factor H gene in two Tunisian families. Int J Nephrol Renovasc Dis 2010; 3:85-92. [PMID: 21694933 PMCID: PMC3108774 DOI: 10.2147/ijnrd.s8373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Indexed: 11/23/2022] Open
Abstract
We carried out a protein and genetic investigation of the factor H gene mutations within two families presenting with a diagnostic suspicion of atypical hemolytic uremic syndrome (aHUS). The results within the patients of the first family revealed a factor H-deficiency. Direct sequencing allowed the detection of a 4-nucleotide deletion in the factor H gene. This deletion was found as the homozygote form in the proband and as the heterozygote form in the parents. Protein and functional analyses of the complement system were normal in all members of the second family. However, the molecular investigation for the father showed the presence of an amino acid substitution in the FH gene. Unfortunately, his two affected children died without being investigated for mutations. The functional consequences of these abnormal proteins are still to be demonstrated.
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Affiliation(s)
- Imen Habibi
- Laboratory of Immunology, Charles Nicolle Hospital, Tunis, Tunisia
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15
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Nathanson S, Kwon T, Elmaleh M, Charbit M, Launay EA, Harambat J, Brun M, Ranchin B, Bandin F, Cloarec S, Bourdat-Michel G, Piètrement C, Champion G, Ulinski T, Deschênes G. Acute neurological involvement in diarrhea-associated hemolytic uremic syndrome. Clin J Am Soc Nephrol 2010; 5:1218-28. [PMID: 20498239 DOI: 10.2215/cjn.08921209] [Citation(s) in RCA: 161] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Neurologic involvement is the most threatening complication of diarrhea-associated hemolytic uremic syndrome (D+HUS). DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We report a retrospective multicenter series of 52 patients with severe initial neurologic involvement that occurred in the course of D+HUS. RESULTS Verotoxigenic Escherichia coli infection was documented in 24. All except two patients had acute renal failure that required peritoneal dialysis, hemodialysis, or both techniques. A first group of eight patients remained with normal consciousness; five of them had protracted seizures. A second group of 23 patients had stuporous coma; five of these had protracted severe seizures, and 18 had a neurologic defect including pyramidal syndrome, hemiplegia or hemiparesia, and extrapyramidal syndrome. A third group of 21 patients had severe coma. Plasma exchanges were undertaken in 25 patients, 11 of whom were treated within 24 hours after the first neurologic sign; four died, two survived with severe sequelae, and five were alive without neurologic defect. Magnetic resonance imaging (MRI) for 29 patients showed that (1) every structure of the central nervous system was susceptible to involvement; (2) no correlation seemed to exist between special profile of localization on early MRI and the final prognosis; and (3) MRI did not exhibit any focal lesions in three patients. The overall prognosis of the series was marked by the death of nine patients and severe sequelae in 13. CONCLUSIONS Neurologic involvement is associated with a severe renal disease but does not lead systematically to death or severe disability.
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Affiliation(s)
- Sylvie Nathanson
- Pediatric Unit, Hôpital Mignot, 177 rue de Versailles, F-78150 le Chesnay, France.
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Sethi SK, Marie-Agnes DD, Thaker N, Hari P, Bagga A. Hemolytic uremic syndrome due to homozygous factor H deficiency. Clin Exp Nephrol 2009; 13:526-530. [PMID: 19568827 DOI: 10.1007/s10157-009-0205-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2009] [Accepted: 06/01/2009] [Indexed: 10/20/2022]
Abstract
The majority of complement factor H mutations associated with atypical hemolytic uremic syndrome (HUS) are heterozygous. Homozygous mutations causing atypical hemolytic uremic syndrome are rare. We report a 7-month-old boy with HUS, severe hypocomplementemia (low C3 and normal C4 levels), and extremely low circulating levels of factor H. Genetic analysis showed homozygous 4 bp deletion in the gene encoding factor H in the patient, with his parents being carriers. The patient showed progression to end-stage renal disease and is presently on chronic ambulatory peritoneal dialysis.
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Affiliation(s)
- Sidharth Kumar Sethi
- Division of Pediatric Nephrology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India
| | - Dragon-Durey Marie-Agnes
- Laboratoire d'Immunologie, Hôpital Européen Georges Pompidou, Université Paris Descartes, Paris, France
| | - Neelam Thaker
- Division of Pediatric Nephrology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India
| | - Pankaj Hari
- Division of Pediatric Nephrology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India
| | - Arvind Bagga
- Division of Pediatric Nephrology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India.
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Liszewski MK, Fang CJ, Atkinson JP. Inhibiting complement activation on cells at the step of C3 cleavage. Vaccine 2009; 26 Suppl 8:I22-7. [PMID: 19388160 DOI: 10.1016/j.vaccine.2008.11.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Nearly half of the proteins in the complement system serve in regulation. Control at the central step of C3 activation is provided by an orchestrated interplay of membrane and plasma regulators. A model system employing Chinese hamster ovary (CHO) cells transfected with human regulators was employed to assist in making functional comparisons. Also, in this experimental setup, the pathway and magnitude of complement activation can be varied while monitoring C4b/C3b deposition and cleavage as well as cytotoxicity. This review describes lessons learned and the application of this model for functionally characterizing mutations in regulators associated with atypical hemolytic uremic syndrome.
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Affiliation(s)
- M Kathryn Liszewski
- Washington University School of Medicine, Department of Internal Medicine, Division of Rheumatology, 660 S. Euclid, Box 8045, St. Louis, MO 63110, USA
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Dzinic SH, Luercio M, Ram JL. Bacterial chemotaxis differences in Escherichia coli isolated from different hosts. Can J Microbiol 2009; 54:1043-52. [PMID: 19096459 DOI: 10.1139/w08-105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The mechanisms mediating the association between Escherichia coli and specific hosts are unknown. This study investigates the hypothesis that the host-specific associations of E. coli strains are mediated in part by differences in chemotaxis. To test this hypothesis, chemotactic responses of E. coli strains isolated from different host groups (carnivores, herbivores, and omnivores) were tested with various attractants. In low-density agar chemotaxis assays, the average motility of E. coli in response to aspartate, serine, and ribose among the different groups was not significantly different; however, strains from carnivores responded significantly more to aspartate, relative to their responses to serine, in comparison with strains from herbivores, which responded equally or better to serine than to aspartate. The relatively greater chemotactic response of strains from carnivores to aspartate than to serine was confirmed in a subset of strains by capillary chemotaxis assay. Differences in responses to serine and aspartate were not due to growth differences, as determined by comparison of 24 h growth curves with glycerol, aspartate, and serine carbon sources. The differences in chemotactic behavior of E. coli strains isolated from herbivores and carnivores support the hypothesis that host-specific associations of E. coli strains are mediated in part by differences in chemotactic behavior.
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Affiliation(s)
- Sijana H Dzinic
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield Street, Detroit, MI48201, USA
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Loirat C, Noris M, Fremeaux-Bacchi V. Complement and the atypical hemolytic uremic syndrome in children. Pediatr Nephrol 2008; 23:1957-72. [PMID: 18594873 PMCID: PMC6904381 DOI: 10.1007/s00467-008-0872-4] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2008] [Revised: 04/22/2008] [Accepted: 04/22/2008] [Indexed: 12/20/2022]
Abstract
Over the past decade, atypical hemolytic uremic syndrome (aHUS) has been demonstrated to be a disorder of the regulation of the complement alternative pathway. Among approximately 200 children with the disease, reported in the literature, 50% had mutations of the complement regulatory proteins factor H, membrane cofactor protein (MCP) or factor I. Mutations in factor B and C3 have also been reported recently. In addition, 10% of children have factor H dysfunction due to anti-factor H antibodies. Early age at onset appears as characteristic of factor H and factor I mutated patients, while MCP-associated HUS is not observed before age 1 year. Low C3 level may occur in patients with factor H and factor I mutation, while C3 level is generally normal in MCP-mutated patients. Normal plasma factor H and factor I levels do not preclude the presence of a mutation in these genes. The worst prognosis is for factor H-mutated patients, as 60% die or reach end-stage renal disease (ESRD) within the first year after onset of the disease. Patients with mutations in MCP have a relapsing course, but no patient has ever reached ESRD in the first year of the disease. Half of the patients with factor I mutations have a rapid evolution to ESRD, but half recover. Early intensive plasmatherapy appears to have a beneficial effect, except in MCP-mutated patients. There is a high risk of graft loss for HUS recurrence or thrombosis in all groups except the MCP-mutated group. Recent success of liver-kidney transplantation combined with plasmatherapy opens this option for patients with mutations of factors synthesized in the liver. New therapies such as factor H concentrate or complement inhibitors offer hope for the future.
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Affiliation(s)
- Chantal Loirat
- Hôpitaux de Paris, Université Paris 7, Hôpital Robert Debré, Pediatric Nephrology, Paris, France.
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