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Yerigeri K, Kadatane S, Mongan K, Boyer O, Burke LLG, Sethi SK, Licht C, Raina R. Atypical Hemolytic-Uremic Syndrome: Genetic Basis, Clinical Manifestations, and a Multidisciplinary Approach to Management. J Multidiscip Healthc 2023; 16:2233-2249. [PMID: 37560408 PMCID: PMC10408684 DOI: 10.2147/jmdh.s245620] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 07/26/2023] [Indexed: 08/11/2023] Open
Abstract
Hemolytic uremic syndrome (HUS) is a thrombotic microangiopathy (TMA) defined by the triad of hemolytic anemia, thrombocytopenia, and acute kidney injury. Microthrombi develop in the glomerular capillaries secondary to endothelial damage and exert shear stress on red blood cells, consume platelets, and contribute to renal dysfunction and failure. Per current understanding of pathophysiology, HUS is classified into infectious, secondary, and atypical disease. The most common etiology is infectious sequelae of Shiga toxin-producing Escherichia coli (STEC); other causative organisms include shigella and salmonella. Secondary HUS arises from cancer, chemotherapy, solid organ and hematopoietic stem cell transplant, pregnancy, or autoimmune disorders. Primary atypical hemolytic-uremic syndrome (aHUS) is associated with genetic mutations in complement and complement regulatory proteins. Under physiologic conditions, complement regulators keep the alternative complement system continuously active at low levels. In times of inflammation, mutations in complement-related proteins lead to uncontrolled complement activity. The hyperactive inflammatory state leads to glomerular endothelial damage, activation of the coagulation cascade, and TMA findings. Atypical hemolytic-uremic syndrome is a rare disorder with a prevalence of 2.21 to 9.4 per million people aged 20 years or younger; children between the ages of 0 and 4 are most affected. Multidisciplinary health care is necessary for timely management of its extra-renal manifestations. These include vascular disease of the heart, brain, and skin, pulmonary hypertension and hemorrhage, and pregnancy complications. Adequate screening is required to monitor for sequelae. First-line treatment is the monoclonal antibody eculizumab, but several organ systems may require specialized interventions and coordination of care with sub-specialists.
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Affiliation(s)
- Keval Yerigeri
- Department of Internal Medicine-Pediatrics, Case Western Reserve University/The MetroHealth System, Cleveland, OH, USA
| | - Saurav Kadatane
- Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Kai Mongan
- Northeast Ohio Medical University, Rootstown, OH, USA
| | - Olivia Boyer
- Department of Pediatric Nephrology, Dialysis and Transplantation, Necker-Enfants Malades Hospital, MARHEA reference Center, Imagine Institute, Paris Cité University, Paris, France
| | - Linda L G Burke
- aHUS Global Advocate with aHUS Alliance, Cape Elizabeth, ME, USA
| | - Sidharth Kumar Sethi
- Department of Pediatric Nephrology and Pediatric Renal Transplant Medicine, Kidney and Urology Institute, Medanta, The Medicity, Gurgaon, Haryana, India
| | - Christoph Licht
- Department of Paediatrics, Division of Nephrology, University of Toronto, Toronto, ON, Canada
| | - Rupesh Raina
- Division of Pediatric Nephrology, Akron Children’s Hospital, Akron, OH, USA
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Ozer H, Baloglu İ, Turkmen K, Tonbul HZ, Selcuk NY. Can eculizumab be an option in traditional treatment-resistant ulcerative colitis? GASTROENTEROLOGY AND HEPATOLOGY FROM BED TO BENCH 2023; 16:445-450. [PMID: 38313350 PMCID: PMC10835087 DOI: 10.22037/ghfbb.v16i4.2689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 06/25/2023] [Indexed: 02/06/2024]
Abstract
Atypical/complement-mediated hemolytic uremic syndrome (A-HUS/CM-HUS) is a hereditary or sporadic disease with thrombotic microangiopathy (TMA). Diarrhea is a trigger that can cause attacks of CM-HUS. Although there are opinions that complement system activation plays a role in intestinal inflammation in patients with inflammatory bowel disease, the association of TMA with inflammatory bowel disease (IBD) has rarely been reported. In our case, a CM-HUS case that developed without an additional triggering factor in the course of ulcerative colitis (UC) was successfully treated with eculizumab, and then UC remission was also achieved. In this context, we would like to point out that the irregularities in the alternative pathway of the complement system may cause clinical findings in extra-renal organs, and the complement system may also play a role in the pathogenesis of inflammatory bowel disease. In addition, we think that our case may guide further studies on the usability of anti-complement therapies in treating patients with IBD who are resistant to conventional treatments.
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Affiliation(s)
- Hakan Ozer
- Department of Nephrology, Meram School of Medicine, Necmettin Erbakan University, Konya, Turkey
| | - İsmail Baloglu
- Department of Nephrology, Meram School of Medicine, Necmettin Erbakan University, Konya, Turkey
| | - Kultigin Turkmen
- Department of Nephrology, Meram School of Medicine, Necmettin Erbakan University, Konya, Turkey
| | - Halil Zeki Tonbul
- Department of Nephrology, Meram School of Medicine, Necmettin Erbakan University, Konya, Turkey
| | - Nedim Yılmaz Selcuk
- Department of Nephrology, Meram School of Medicine, Necmettin Erbakan University, Konya, Turkey
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Raina R, Vijayvargiya N, Khooblall A, Melachuri M, Deshpande S, Sharma D, Mathur K, Arora M, Sethi SK, Sandhu S. Pediatric Atypical Hemolytic Uremic Syndrome Advances. Cells 2021; 10:3580. [PMID: 34944087 PMCID: PMC8700093 DOI: 10.3390/cells10123580] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/12/2021] [Accepted: 12/15/2021] [Indexed: 12/30/2022] Open
Abstract
Atypical hemolytic uremic syndrome (aHUS) is a rare disorder characterized by dysregulation of the alternate pathway. The diagnosis of aHUS is one of exclusion, which complicates its early detection and corresponding intervention to mitigate its high rate of mortality and associated morbidity. Heterozygous mutations in complement regulatory proteins linked to aHUS are not always phenotypically active, and may require a particular trigger for the disease to manifest. This list of triggers continues to expand as more data is aggregated, particularly centered around COVID-19 and pediatric vaccinations. Novel genetic mutations continue to be identified though advancements in technology as well as greater access to cohorts of interest, as in diacylglycerol kinase epsilon (DGKE). DGKE mutations associated with aHUS are the first non-complement regulatory proteins associated with the disease, drastically changing the established framework. Additional markers that are less understood, but continue to be acknowledged, include the unique autoantibodies to complement factor H and complement factor I which are pathogenic drivers in aHUS. Interventional therapeutics have undergone the most advancements, as pharmacokinetic and pharmacodynamic properties are modified as needed in addition to their as biosimilar counterparts. As data continues to be gathered in this field, future advancements will optimally decrease the mortality and morbidity of this disease in children.
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Affiliation(s)
- Rupesh Raina
- Akron Nephrology Associates/Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA; (N.V.); (A.K.); (S.D.); (K.M.); (M.A.)
- Department of Nephrology, Akron Children’s Hospital, Akron, OH 44308, USA
| | - Nina Vijayvargiya
- Akron Nephrology Associates/Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA; (N.V.); (A.K.); (S.D.); (K.M.); (M.A.)
| | - Amrit Khooblall
- Akron Nephrology Associates/Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA; (N.V.); (A.K.); (S.D.); (K.M.); (M.A.)
| | - Manasa Melachuri
- Department of Medicine, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (M.M.); (D.S.)
| | - Shweta Deshpande
- Akron Nephrology Associates/Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA; (N.V.); (A.K.); (S.D.); (K.M.); (M.A.)
| | - Divya Sharma
- Department of Medicine, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (M.M.); (D.S.)
| | - Kashin Mathur
- Akron Nephrology Associates/Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA; (N.V.); (A.K.); (S.D.); (K.M.); (M.A.)
| | - Manav Arora
- Akron Nephrology Associates/Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA; (N.V.); (A.K.); (S.D.); (K.M.); (M.A.)
| | - Sidharth Kumar Sethi
- Pediatric Nephrology & Pediatric Kidney Transplantation, Kidney and Urology Institute, Medanta, The Medicity Hospital, Gurgaon 122007, India;
| | - Sonia Sandhu
- Hematology and Oncology, Cleveland Clinic Akron General Medical Center, Akron, OH 44307, USA;
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Koopman JJE, van Essen MF, Rennke HG, de Vries APJ, van Kooten C. Deposition of the Membrane Attack Complex in Healthy and Diseased Human Kidneys. Front Immunol 2021; 11:599974. [PMID: 33643288 PMCID: PMC7906018 DOI: 10.3389/fimmu.2020.599974] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 12/21/2020] [Indexed: 12/11/2022] Open
Abstract
The membrane attack complex-also known as C5b-9-is the end-product of the classical, lectin, and alternative complement pathways. It is thought to play an important role in the pathogenesis of various kidney diseases by causing cellular injury and tissue inflammation, resulting in sclerosis and fibrosis. These deleterious effects are, consequently, targeted in the development of novel therapies that inhibit the formation of C5b-9, such as eculizumab. To clarify how C5b-9 contributes to kidney disease and to predict which patients benefit from such therapy, knowledge on deposition of C5b-9 in the kidney is essential. Because immunohistochemical staining of C5b-9 has not been routinely conducted and never been compared across studies, we provide a review of studies on deposition of C5b-9 in healthy and diseased human kidneys. We describe techniques to stain deposits and compare the occurrence of deposits in healthy kidneys and in a wide spectrum of kidney diseases, including hypertensive nephropathy, diabetic nephropathy, membranous nephropathy, IgA nephropathy, lupus nephritis, C3 glomerulopathy, and thrombotic microangiopathies such as the atypical hemolytic uremic syndrome, vasculitis, interstitial nephritis, acute tubular necrosis, kidney tumors, and rejection of kidney transplants. We summarize how these deposits are related with other histological lesions and clinical characteristics. We evaluate the prognostic relevance of these deposits in the light of possible treatment with complement inhibitors.
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Affiliation(s)
- Jacob J E Koopman
- Division of Renal Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States
- Division of Nephrology, Department of Internal Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - Mieke F van Essen
- Division of Nephrology, Department of Internal Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - Helmut G Rennke
- Division of Renal Pathology, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States
| | - Aiko P J de Vries
- Division of Nephrology, Department of Internal Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - Cees van Kooten
- Division of Nephrology, Department of Internal Medicine, Leiden University Medical Center, Leiden, Netherlands
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Horváth O, Kelen K, Prohászka Z, Hosszú Á, Szabó AJ, Reusz GS. Atypical HUS and Crohn's disease-interference of intestinal disease activity with complement-blocking treatment. Pediatr Nephrol 2021; 36:3277-3280. [PMID: 34328541 PMCID: PMC8445858 DOI: 10.1007/s00467-021-05167-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/26/2021] [Accepted: 06/02/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND In atypical hemolytic-uremic syndrome (aHUS), various defects of the complement system have been reported to explain pathophysiology. Therapeutic options for complement inhibition are well-recognized; however, the links between various immune-derived diseases and aHUS are unclear, and their interference with treatment efficacy during long-term complement-blocking therapy is scarcely known. CASE-DIAGNOSIS/TREATMENT We present a pediatric patient who developed aHUS with acute kidney injury in parallel with the onset of Crohn's disease (CD), and who required long-term complement-blocking therapy with eculizumab (ECU). Unexpectedly, during the 6-year ECU treatment, an important intra-patient variation of the degree of complement inhibition was observed. In spite of continuous and stable doses of complement-blocking therapy, periods of incomplete blockade were observed in strong association with relapses of CD. When conventional and later biological therapy with adalimumab was introduced, with CD going into remission, complement blockade became complete again. Despite periodically low ECU levels and insufficient complement inhibition, no clinical or hematological signs of aHUS recurrence were detected during CD relapses. CONCLUSION In aHUS cases secondary to CD, close monitoring of both complement inhibition and serum ECU levels is needed as intestinal disease can interfere with complement-blocking treatment. Increased doses of ECU may be necessary to maintain therapeutic blood levels of ECU and full complement blockade, especially if the intestinal disease is not under control.
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Affiliation(s)
- Orsolya Horváth
- First Department of Pediatrics, Semmelweis University, HU 1083 Budapest, Hungary ,Pediatric Hematology and Stem Cell Transplantation Unit, Central Hospital of Southern Pest National Institute of Hematology and Infectious Diseases, Budapest, Hungary
| | - Kata Kelen
- First Department of Pediatrics, Semmelweis University, HU 1083 Budapest, Hungary
| | - Zoltán Prohászka
- Research Laboratory, Department of Internal Medicine and Hematology, Semmelweis University, Budapest, Hungary
| | - Ádám Hosszú
- First Department of Pediatrics, Semmelweis University, HU 1083 Budapest, Hungary
| | - Attila J Szabó
- First Department of Pediatrics, Semmelweis University, HU 1083 Budapest, Hungary
| | - George S Reusz
- First Department of Pediatrics, Semmelweis University, HU, 1083, Budapest, Hungary.
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Eculizumab treatment of thrombotic microangiopathy in a patient with ulcerative colitis. Clin J Gastroenterol 2019; 13:344-348. [PMID: 31612381 DOI: 10.1007/s12328-019-01052-z] [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: 05/20/2019] [Accepted: 10/03/2019] [Indexed: 10/25/2022]
Abstract
Secondary thrombotic microangiopathy (TMA) can be induced by several underlying conditions and drugs, yet coexistence of TMA and inflammatory bowel disease (IBD) has only infrequently been documented. A successful management beyond supportive care in cases with secondary TMA represents a challenge, as some underlying conditions might amplify complement dysregulation or even unmask a genetic predisposition to atypical hemolytic uremic syndrome (HUS)-both of which could require treatment with a complement blocking agent. We observed a case in which TMA developed in a patient with ulcerative colitis (UC). Genetic screening showed a heterozygous mutation in diacylglycerol kinase ε (DGKE). Eculizumab resulted in complete resolution of TMA, however UC relapsed after cessation of eculizumab.
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Hanna RM, Merin N, Burwick RM, Abdelnour L, Selamet U, Yanny B, Bui P, Fouad M, Kurtz I. Successful use of eculizumab to treat atypical hemolytic uremic syndrome in patients with inflammatory bowel disease. Thromb J 2019; 17:18. [PMID: 31516395 PMCID: PMC6732828 DOI: 10.1186/s12959-019-0207-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 07/31/2019] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Atypical hemolytic uremic syndrome is a rare group of disorders that have in common underlying complement amplifying conditions. These conditions can accelerate complement activation that results in a positive feedback cycle. The known triggers for complement activation can be diverse and include, infection, autoimmune disease, and malignancy. Recent reports suggest that certain autoimmune and rheumatological triggers of complement activation may result in atypical hemolytic uremic syndrome that does not resolve despite treating the underlying disorder. Specifically, patients with systemic lupus erythematosus and microangiopathic hemolysis may not respond to treatment of their underlying rheumatological trigger but responded to complement blockade. CASE PRESENTATIONS We report two patients with inflammatory bowel disease complicated by development of atypical hemolytic uremic syndrome. In both cases, patients were on treatment for inflammatory bowel disease, that was not well controlled/flaring at the time. The first patient is a male who developed Crohn's disease and microangiopathic hemolysis at age 5 and was treated with eculizumab successfully. Discontinuation of the medication led to multiple relapses, and the patient currently is being treated with eculizumab and has normal hematological and stable renal parameters. The second patient is a 49-year-old female with Ulcerative Colitis treated with 6-Mercaptopurine. She developed acute kidney injury and microangiopathic hemolysis. Prompt diagnosis and treatment with eculizumab resulted in the recovery of kidney injury along with a complete hematological response. CONCLUSIONS These two cases are the fifth and sixth patients to be published in the literature with atypical hemolytic uremic syndrome and inflammatory bowel disease treated with complement blockade. This confirms that C5 complement blockade is effective in treating complement mediated thrombotic microangiopathy/atypical hemolytic uremic syndrome when it is triggered in patients with inflammatory bowel disease.
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Affiliation(s)
- Ramy M. Hanna
- Department of Medicine, Division of Nephrology, UCLA David Geffen School of Medicine, Room 7-155, Factor Bldg. 700 Tiverton Ave, Los Angeles, CA 90095 USA
- Department of Medicine, Division of Nephrology, University of California Irvine School of Medicine, Irvine CA, USA
| | - Noah Merin
- Department of Medicine, Division of Hematology Oncology, Cedars Sinai Medical Center, Los Angeles, USA
| | - Richard M. Burwick
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Cedars Sinai Medical Center, Los Angeles, USA
| | - Lama Abdelnour
- Department of Medicine, Division of Nephrology, UCLA David Geffen School of Medicine, Room 7-155, Factor Bldg. 700 Tiverton Ave, Los Angeles, CA 90095 USA
| | - Umut Selamet
- Department of Medicine, Division of Nephrology, UCLA David Geffen School of Medicine, Room 7-155, Factor Bldg. 700 Tiverton Ave, Los Angeles, CA 90095 USA
| | - Beshoy Yanny
- Department of Medicine, Division of Digestive Diseases, UCLA David Geffen School of Medicine, Los Angeles, USA
| | - Patrick Bui
- Department of Medicine, UCLA David Geffen School of Medicine, Los Angeles, USA
| | - Mary Fouad
- Department of Medicine, UCLA David Geffen School of Medicine, Los Angeles, USA
| | - Ira Kurtz
- Department of Medicine, Division of Nephrology, UCLA David Geffen School of Medicine, Room 7-155, Factor Bldg. 700 Tiverton Ave, Los Angeles, CA 90095 USA
- UCLA Brain Research Institute, Los Angeles, USA
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Formeck C, Swiatecka-Urban A. Extra-renal manifestations of atypical hemolytic uremic syndrome. Pediatr Nephrol 2019; 34:1337-1348. [PMID: 30109445 PMCID: PMC8627279 DOI: 10.1007/s00467-018-4039-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 07/31/2018] [Accepted: 08/01/2018] [Indexed: 01/31/2023]
Abstract
Atypical hemolytic uremic syndrome (aHUS) is a rare and complex disease resulting from abnormal alternative complement activation with a wide range of clinical presentations. Extra-renal manifestations of aHUS can involve many organ systems, including the peripheral and central nervous, gastrointestinal, cardiovascular, integumentary, pulmonary, as well as the eye. While some of these extra-renal manifestations occur in the acute phase of aHUS, some can also occur as long-term sequelae of unopposed complement activation. Extra-renal symptoms are observed in approximately 20% of patients with aHUS, with the incidence of specific organ system complications ranging from a few case reports to 50% of described patients. Careful monitoring for extra-renal involvement is critical in patients with aHUS, as prompt evaluation and management may decrease the risk of high morbidity and mortality associated with aHUS.
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Affiliation(s)
- Cassandra Formeck
- Department of Nephrology, Children's Hospital of Pittsburgh of UPMC, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
| | - Agnieszka Swiatecka-Urban
- Department of Nephrology, Children's Hospital of Pittsburgh of UPMC, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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Extra-renal manifestations of atypical hemolytic uremic syndrome. PEDIATRIC NEPHROLOGY (BERLIN, GERMANY) 2019. [PMID: 30109445 DOI: 10.1007/s00467-018-4039-7)] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Atypical hemolytic uremic syndrome (aHUS) is a rare and complex disease resulting from abnormal alternative complement activation with a wide range of clinical presentations. Extra-renal manifestations of aHUS can involve many organ systems, including the peripheral and central nervous, gastrointestinal, cardiovascular, integumentary, pulmonary, as well as the eye. While some of these extra-renal manifestations occur in the acute phase of aHUS, some can also occur as long-term sequelae of unopposed complement activation. Extra-renal symptoms are observed in approximately 20% of patients with aHUS, with the incidence of specific organ system complications ranging from a few case reports to 50% of described patients. Careful monitoring for extra-renal involvement is critical in patients with aHUS, as prompt evaluation and management may decrease the risk of high morbidity and mortality associated with aHUS.
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Comorbidity of inflammatory bowel disease with atypical hemolytic uremic syndrome in pediatric patients. Clin Nephrol Case Stud 2019; 7:35-40. [PMID: 31312592 PMCID: PMC6595396 DOI: 10.5414/cncs109511] [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: 04/05/2018] [Accepted: 04/03/2019] [Indexed: 02/03/2023] Open
Abstract
Atypical hemolytic uremic syndrome (aHUS) is a form of thrombotic microangiopathy mediated by dysregulation of the alternative complement pathway. Complement-amplifying conditions such as respiratory and gastrointestinal infections, pregnancy, malignancy, and systemic autoimmune diseases such as systemic lupus erythematosus have been associated with the clinical manifestation of aHUS. Inflammation of the gastrointestinal tract is a potent stimulus for complement activation, and we describe a series of three pediatric patients with aHUS and comorbidity of inflammatory bowel disease (IBD). In two of the three cases, the diagnosis of aHUS preceded the diagnosis of IBD, perhaps suggesting a mechanistic link between complement dysregulation and thrombotic microangiopathy in the gastrointestinal tract and the ensuing inflammatory changes of IBD.
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Viada Bris JF, Velasco Rodríguez-Belvís M, de Lucas Collantes C, Aparicio López C, Martínez de Azagra A, de Lama Caro-Patón G, de Prada Vicente I, Muñoz Codoceo RA. Ulcerative Colitis and Atypical Hemolytic-Uremic Syndrome: An Unusual But Potentially Life-threatening Complication. Inflamm Bowel Dis 2019; 25:e27-e28. [PMID: 29931191 DOI: 10.1093/ibd/izy226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Hemolytic-uremic syndrome (HUS) is defined as the triad of nonimmune hemolytic anemia, thrombocytopenia, and acute renal failure, in which the underlying lesions are mediated by systemic thrombotic microangiopathy (TMA). The atypical HUS (aHUS) can be considered a subtype of HUS that is rare in childhood and has a worse prognosis. Recent findings have established that the TMA in aHUS are consequences of the disregulation of the complement activation, leading to endotelial damage mediated by the complement terminal pathway.1, 2 Likewise, previous research suggests an important role for the deregulation of the alternative complement cascade in the pathogenesis of inflammatory bowel disease (IBD).3, 4 We report the case of a patient with ulcerative colitis (UC) who developed aHUS during a flare-up of her chronic disease. This association is extremely infrequent and had been previously reported in only 1 patient.5.
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Affiliation(s)
| | | | | | | | | | | | | | - Rosa Ana Muñoz Codoceo
- Department of Gastroenterology and Nutrition, Hospital Infantil Universitario Niño Jesús, Madrid, Spain
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Bianchi L, Gaiani F, Vincenzi F, Kayali S, Di Mario F, Leandro G, De' Angelis GL, Ruberto C. Hemolytic uremic syndrome: differential diagnosis with the onset of inflammatory bowel diseases. ACTA BIO-MEDICA : ATENEI PARMENSIS 2018; 89:153-157. [PMID: 30561409 PMCID: PMC6502198 DOI: 10.23750/abm.v89i9-s.7911] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Indexed: 01/29/2023]
Abstract
BACKGROUND Shiga-toxin Escherichia coli productor (STEC) provokes frequently an important intestinal damage that may be considered in differential diagnosis with the onset of Inflammatory Bowel Disease (IBD). The aim of this work is to review in the current literature about Hemolytic Uremic Syndrome (HUS) and IBD symptoms at the onset, comparing the clinical presentation and symptoms, as the timing of diagnosis and of the correct treatment of both these conditions is a fundamental prognostic factor. A focus is made about the association between typical or atypical HUS and IBD and a possible renal involvement in patient with IBD (IgA-nephropathy). METHODS A systematic review of scientific articles was performed consulting the databases PubMed, Medline, Google Scholar, and consulting most recent textbooks of Pediatric Nephrology. RESULTS In STEC-associated HUS, that accounts for 90% of cases of HUS in children, the microangiopathic manifestations are usually preceded by gastrointestinal symptoms. Initial presentation may be considered in differential diagnosis with IBD onset. The transverse and ascending colon are the segments most commonly affected, but any area from the esophagus to the perianal area can be involved. The more serious manifestations include severe hemorrhagic colitis, bowel necrosis and perforation, rectal prolapse, peritonitis and intussusception. Severe gastrointestinal involvement may result in life-threatening complications as toxic megacolon and transmural necrosis of the colon with perforation, as in Ulcerative Colitis (UC). Transmural necrosis of the colon may lead to subsequent colonic stricture, as in Crohn Disease (CD). Perianal lesions and strictures are described. In some studies, intestinal biopsies were performed to exclude IBD. Elevation of pancreatic enzymes is common. Liver damage and cholecystitis are other described complications. There is no specific form of therapy for STEC HUS, but appropriate fluid and electrolyte management (better hyperhydration when possible), avoiding antidiarrheal drugs, and possibly avoiding antibiotic therapy, are recommended as the best practice. In atypical HUS (aHUS) gastrointestinal manifestation are rare, but recently a study evidenced that gastrointestinal complications are common in aHUS in presence of factor-H autoantibodies. Some report of patients with IBD and contemporary atypical-HUS were found, both for CD and UC. The authors conclude that deregulation of the alternative complement pathway may manifest in other organs besides the kidney. Finally, searching for STEC-infection, or broadly for Escherichia coli (E. coli) infection, and IBD onset, some reviews suggest a possible role of adherent invasive E. coli (AIEC) on the pathogenesis of IBD. CONCLUSIONS The current literature shows that gastrointestinal complications of HUS are quite exclusive of STEC-associated HUS, whereas aHUS have usually mild or absent intestinal involvement. Severe presentation as toxic megacolon, perforation, ulcerative colitis, peritonitis is similar to IBD at the onset. Moreover, some types of E. coli (AIEC) have been considered a risk factor for IBD. Recent literature on aHUS shows that intestinal complications are more common than described before, particularly for patients with anti-H factor antibodies. Moreover, we found some report of patient with both aHUS and IBD, who benefit from anti-C5 antibodies injection (Eculizumab).
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Affiliation(s)
- Laura Bianchi
- Pediatric Emergency Unit, University Hospital of Parma, Maternal and Infant Department, Parma, Italy.
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Atypical hemolytic uremic syndrome in the setting of complement-amplifying conditions: case reports and a review of the evidence for treatment with eculizumab. J Nephrol 2016; 30:347-362. [PMID: 27848226 PMCID: PMC5437142 DOI: 10.1007/s40620-016-0357-7] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 10/14/2016] [Indexed: 01/20/2023]
Abstract
Atypical hemolytic uremic syndrome (aHUS) is a rare, genetic, progressive, life-threatening form of thrombotic microangiopathy (TMA) predominantly caused by dysregulation of the alternative pathway of the complement system. Complement-amplifying conditions (CACs), including pregnancy complications [preeclampsia, HELLP (hemolysis, elevated liver enzymes, low platelet count) syndrome], malignant hypertension, autoimmune diseases, transplantation, and others, are associated with the onset of TMA in up to 69 % of cases of aHUS. CACs activate the alternative pathway of complement and may be comorbid with aHUS or may unmask a previously undiagnosed case. In this review, three case reports are presented illustrating the onset and diagnosis of aHUS in the setting of different CACs (pregnancy complications, malignant hypertension, renal transplantation). The report also reviews the evidence for a variety of CACs, including those mentioned above as well as infections and drug-induced TMA, and the overlap with aHUS. Finally, we introduce an algorithm for diagnosis and treatment of aHUS in the setting of CACs. If TMA persists despite initial management for the specific CAC, aHUS should be considered. The terminal complement inhibitor eculizumab should be initiated for all patients with confirmed diagnosis of aHUS, with or without a comorbid CAC.
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Greenwood GT. Case report of atypical hemolytic uremic syndrome with retinal arterial and venous occlusion treated with eculizumab. Int Med Case Rep J 2015; 8:235-9. [PMID: 26508891 PMCID: PMC4610771 DOI: 10.2147/imcrj.s90640] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Atypical hemolytic uremic syndrome (aHUS) is a rare disease caused by chronic, uncontrolled activation of the alternative complement pathway, leading to thrombotic microangiopathy. Renal impairment and progression to end-stage renal disease are common in untreated patients with aHUS, and extrarenal manifestations are being increasingly characterized in the literature. Ocular involvement remains rare in aHUS. This report describes a patient with aHUS with bilateral central retinal artery and vein occlusion, vitreous hemorrhage, and blindness in addition to renal impairment. The patient's hematologic and renal parameters and ocular manifestation improved following initiation of eculizumab therapy.
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