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Zuraw BL, Christiansen SC. Classification, Diagnosis, and Pathology of Angioedema Without Hives. Immunol Allergy Clin North Am 2024; 44:529-541. [PMID: 38937014 DOI: 10.1016/j.iac.2024.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
A clear disease classification schema coupled with an understanding of the specific mechanisms involved in the different types of angioedema without hives informs the diagnostic assessment. The recommended approach involves several key steps. Foremost is the recognizing of the clinical clues which allow for the differentiation of mast cell-mediated disorders from bradykinin-mediated angioedema. Enhanced vascular permeability related to bradykinin is of critical importance to identify given the implications for disease morbidity and risk of mortality. The ability to efficiently categorize and diagnose all forms of angioedema results in improved patient outcomes.
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Affiliation(s)
- Bruce L Zuraw
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, Mail Code 0732, La Jolla, CA 92093, USA; Medicine Service, San Diego Veterans Administration Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA.
| | - Sandra C Christiansen
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, Mail Code 0732, La Jolla, CA 92093, USA
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Dias de Castro E, Pinhal AL, Bragança M, Parente Freixo J, Martinho A. Hereditary angioedema with normal C1-inhibitor: Clinical and genetic characterization of 15 Portuguese unrelated families. Ann Allergy Asthma Immunol 2024; 132:730-736. [PMID: 38342132 DOI: 10.1016/j.anai.2024.01.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 01/09/2024] [Accepted: 01/26/2024] [Indexed: 02/13/2024]
Abstract
BACKGROUND Hereditary angioedema with normal C1-inhibitor (HAE-nC1-INH) is a rare genetic disease with similar phenotype to HAE-C1-INH but different genetic background. Currently, 6 subtypes are recognized, based on the underlying mutations. Several aspects need further clarification. OBJECTIVE To assess clinical features of patients with genetically characterized HAE-nC1-INH from the North of Portugal. METHODS Retrospective assessment of clinical data from all patients with HAE-nC1-INH followed at a HAE Reference Center. RESULTS A total of 41 patients were identified, 4 with no family history. The FXII mutation Thr328Lys (38 carriers) was the most prevalent. There were 3 new potentially disease-causing variants linked to HAE-nC1-INH identified (c.529+4A>G:FXII; Cys248*:Kininogen-1; and Arg261His:Plasminogen). The HAE-FXII cohort included 82% females and 71.8% symptomatic patients. Penetrance rate was significantly higher in females (81.3% vs 28.6%; P = .012). A hormonal influence was observed in 96.2% of the symptomatic females, although 62.5% remained symptomatic after oral estrogen withdrawal. Trauma and dental procedures were frequent triggers (82.6% and 45.5%, respectively). Main locations were facial (described by 96%), lips (82.1%), and eyelids (64.3%). One patient reported erythema marginatum as prodrome. Plasma-derived C1-INH was effective as short-term prophylaxis in all treated patients, but only in 80% as on-demand treatment. Icatibant was effectively used on demand in 9 patients, but with relapses in 5 (57%). CONCLUSION We described a large Portuguese series of patients with HAE-nC1-INH genetically characterized. Differences with others may contribute to improve current unmet needs and raise awareness of this rare disease. We highlighted the identification of 3 new variants (additional molecular studies are ongoing) and the report of erythema marginatum in HAE-nC1-INH.
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Affiliation(s)
- Eunice Dias de Castro
- Allergy and Clinical Immunology Department, Centro Hospitalar Universitário de S. João EPE, Porto, Portugal; Public Health and Forensic Sciences and Medical Education Department, Faculty of Medicine, University of Porto, Porto, Portugal.
| | - Ana Luísa Pinhal
- Allergy and Clinical Immunology Department, Centro Hospitalar Universitário de S. João EPE, Porto, Portugal
| | - Mariana Bragança
- Allergy and Clinical Immunology Department, Centro Hospitalar Universitário de S. João EPE, Porto, Portugal
| | - João Parente Freixo
- Center for Predictive and Preventive Genetics, Institute for Molecular and Cell Biology, University of Porto, Porto, Portugal; Instituto de Investigação e Inovação em Saúde, University of Porto, Porto, Portugal
| | - António Martinho
- Centro do Sangue e Transplantação de Coimbra, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal
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Katelaris CH, Grumach AS, Bork K. Angioedema With Normal Complement Studies: What Do We Know? THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY. IN PRACTICE 2023; 11:2309-2314. [PMID: 37343921 DOI: 10.1016/j.jaip.2023.06.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 06/01/2023] [Accepted: 06/12/2023] [Indexed: 06/23/2023]
Abstract
Angioedema is generally readily recognizable clinically and is characterized by localized nonpitting edema involving subcutaneous, submucosal, or deep dermal tissue caused by increased vascular permeability and extravasation of intravascular fluid. It can occur via a variety of mechanisms. A number of clinical conditions (masqueraders) are occasionally mistaken for angioedema. Clinical classification of the various angioedema forms begins with noting the presence or absence of concurrent urticaria or wheals. Pathogenesis can be considered through two broad categories: mast cell-mediated with release of vasoactive mediators causing angioedema usually associated with urticaria or in the context of an anaphylactic reaction; and bradykinin (BK)-driven, in which increased vascular permeability is mediated by BK. BK-mediated angioedema does not occur with urticaria, nor does it respond to antiallergic medications. The various forms of hereditary angioedema are included in this category, requiring specific tests of C4 and C1 inhibitor level and function to confirm the diagnosis. Angiotensin converting enzyme inhibitors, which impair the degradation of BK, account for up to a third of all patients with angioedema presenting to the emergency department. Finally, angioedema may occur by yet unknown mechanisms; under this circumstance, it is difficult to manage.
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Affiliation(s)
- Constance H Katelaris
- Immunology/Allergy Unit, Department of Medicine, Campbelltown Hospital and Faculty of Medicine, Western Sydney University, Campbelltown, New South Wales, Australia.
| | - Anete S Grumach
- Clinical Immunology, Department of Clinical Medicine, Faculty of Medicine, Centro Universitario FMABC, Santo Andre, São Paulo, Brazil.
| | - Konrad Bork
- Department of Dermatology, University Medical Center, Johannes Gutenberg University, Mainz, Germany
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Maurer M, Magerl M. Differences and Similarities in the Mechanisms and Clinical Expression of Bradykinin-Mediated vs. Mast Cell-Mediated Angioedema. Clin Rev Allergy Immunol 2021; 61:40-49. [PMID: 33534062 PMCID: PMC8282544 DOI: 10.1007/s12016-021-08841-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/13/2021] [Indexed: 12/22/2022]
Abstract
Angioedema (AE), transient localized swelling due to extravasated fluid, is commonly classified as mast cell mediator-induced, bradykinin-mediated or of unknown cause. AE often occurs more than once, and it is these recurrent forms of AE that are challenging for patients and physicians, and they are the ones we focus on and refer to as AE in this review. Since effective treatment depends on the causative mediator, reliable and early diagnosis is essential. Although their clinical presentations bear similarities, many forms of angioedema exhibit specific patterns of clinical appearance or disease history that may aid in diagnosis. Here, we describe the most common differences and similarities in the mechanisms and clinical features of bradykinin-mediated and mast cell mediator-induced types of angioedema. We first provide an overview of the diseases that manifest with mast cell mediator-induced versus bradykinin-mediated angioedema as well as their respective underlying pathogenesis. We then compare these diseases for key clinical features, including angioedema location, course and duration of swelling, attack frequency, prevalence and relevance of prodromal signs and symptoms, triggers of angioedema attacks, and other signs and symptoms including wheals, age of onset, and duration. Our review and comparison of the clinical profiles of different types of angioedema incorporate our own clinical experience as well as published information. Our aim is to highlight that mast cell mediator-induced and bradykinin-mediated angioedema types share common features but are different in many aspects. Knowledge of the differences in underlying pathomechanisms and clinical profiles between different types of angioedema can help with the diagnostic approach in affected patients and facilitate targeted and effective treatment.
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Affiliation(s)
- Marcus Maurer
- Dermatological Allergology, Allergie-Centrum-Charité, Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.
| | - Markus Magerl
- Dermatological Allergology, Allergie-Centrum-Charité, Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
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5
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Sharma J, Jindal AK, Banday AZ, Kaur A, Rawat A, Singh S, Longhurst H. Pathophysiology of Hereditary Angioedema (HAE) Beyond the SERPING1 Gene. Clin Rev Allergy Immunol 2021; 60:305-315. [PMID: 33442779 DOI: 10.1007/s12016-021-08835-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2021] [Indexed: 11/29/2022]
Abstract
Hereditary Angioedema (HAE) is an autosomal dominant disorder characterized clinically by recurrent episodes of swelling involving subcutaneous tissues, gastrointestinal tract, and oro-pharyngeal area. Gene mutations are the most common genetic cause of HAE and observed in more than 90% of patients. More than 700 mutation variants have been described so far. Patients with angioedema who have no mutations in the gene for C1-INH and normal levels and activity of this inhibitor are labelled: normal C1 inhibitor HAE. These include genetic mutations in factor 12 gene, plasminogen gene, angiopoietin gene, kininogen 1, and myoferlin genes. The clinical manifestations of patients with these mutations are similar to with patients with C1-INH gene mutations. However, a later age of onset, oro-pharyngeal involvement, and higher female preponderance have been reported in these rare subtypes of hereditary angioedema. With the advent and increased accessibility of whole-exome sequencing, it is expected that new genetic defects and novel pathophysiological pathways will be identified in families with HAE of unknown cause or normal C1-INH angioedema. This review covers some of the recent advances in the field of HAE. The review focuses on pathophysiology of HAE beyond the well-known C1-INH deficiency phenotypes, including various biomarkers that can serve the diagnosis and management of these rare disorders.
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Affiliation(s)
- Jyoti Sharma
- Allergy Immunology Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Ankur Kumar Jindal
- Allergy Immunology Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
| | - Aaqib Zaffar Banday
- Allergy Immunology Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Anit Kaur
- Allergy Immunology Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Amit Rawat
- Allergy Immunology Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Surjit Singh
- Allergy Immunology Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Hilary Longhurst
- Department of Clinical Immunology, University College Hospitals, London and Addenbrooke's Hospital, Cambridge, UK
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Bork K, Machnig T, Wulff K, Witzke G, Prusty S, Hardt J. Clinical features of genetically characterized types of hereditary angioedema with normal C1 inhibitor: a systematic review of qualitative evidence. Orphanet J Rare Dis 2020; 15:289. [PMID: 33059692 PMCID: PMC7559394 DOI: 10.1186/s13023-020-01570-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 10/05/2020] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Hereditary angioedema (HAE) with normal C1 inhibitor (C1-INH) (HAEnCI) is associated with skin swellings, abdominal attacks, and the risk of asphyxia due to upper airway obstruction. Several different gene mutations linked to the HAE phenotype have been identified. Our aim was to qualitatively assess and describe the clinical differentiators of these genetically identified HAEnCI types. To achieve this, we performed a systematic literature review of patients with angioedema symptoms and a genetically confirmed diagnosis of an HAEnCI type. RESULTS A systematic literature search, conducted in March 2020, returned 132 records, 43 of which describe patients with symptoms of angioedema and a genetically confirmed diagnosis of an HAEnCI type. Overall, this included 602 patient cases from 220 families. HAEnCI with a mutation in the coagulation factor XII gene (F12) (HAE-FXII) was diagnosed in 446 patients from 185 families (male:female ratio = 1:10). Estrogens (oral contraceptives, hormonal replacement therapy, and pregnancy) negatively impacted the course of disease in most female patients (252 of 277). Asphyxia occurred in 2 of 446 patients. On-demand and/or long-term prophylaxis treatment included C1-INH concentrates, icatibant, progestins, and tranexamic acid. HAEnCI with a specific mutation in the plasminogen gene (HAE-PLG) was diagnosed in 146 patients from 33 families (male:female ratio = 1:3). Estrogens had a negative influence on the course of disease in the minority of female patients (14 of 62). Tongue swelling was an important clinical feature. Asphyxia occurred in 3 of 146 patients. On-demand treatment with icatibant and C1-INH concentrate and long-term prophylaxis with progestins and tranexamic acid were effective. HAEnCI with a specific mutation in the angiopoietin-1 gene (HAE-ANGPT1) was diagnosed in 4 patients from 1 family and HAEnCI with a specific mutation in the kininogen-1 gene (HAE-KNG1) in 6 patients from 1 family. CONCLUSIONS A number of clinical differentiators for the different types of HAEnCI have been identified which may support clinicians to narrow down the correct diagnosis of HAEnCI prior to genetic testing and thereby guide appropriate treatment and management decisions. However, confirmation of the causative gene mutation by genetic testing will always be required.
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Affiliation(s)
- Konrad Bork
- Department of Dermatology, University Medical Center, Johannes Gutenberg University, Langenbeckstr. 1, 55131, Mainz, Germany.
| | | | - Karin Wulff
- University Medicine, Ernst Moritz Arndt University, Greifswald, Germany
| | - Guenther Witzke
- Department of Dermatology, University Medical Center, Johannes Gutenberg University, Langenbeckstr. 1, 55131, Mainz, Germany
| | | | - Jochen Hardt
- Department of Medical Psychology and Medical Sociology, Johannes Gutenberg University, Mainz, Germany
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Marcelino-Rodriguez I, Callero A, Mendoza-Alvarez A, Perez-Rodriguez E, Barrios-Recio J, Garcia-Robaina JC, Flores C. Bradykinin-Mediated Angioedema: An Update of the Genetic Causes and the Impact of Genomics. Front Genet 2019; 10:900. [PMID: 31611908 PMCID: PMC6776636 DOI: 10.3389/fgene.2019.00900] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 08/26/2019] [Indexed: 12/31/2022] Open
Abstract
Recurrent episodes of bradykinin-mediated angioedema (Bk-AE) can associate with acquired or hereditary conditions, the former most commonly developing secondarily to a pharmacological treatment. Despite successful genomic advances that have led to the identification of a large number of disease genes irrespective of disease prevalence, their application to Bk-AE has barely occurred. As a consequence, the genetic causes of Bk-AE remain poorly understood, obstructing the identification of patient subtypes and the development of precision medicine strategies. This review provides an update of the genetic studies completed to date on the acquired forms, which have almost exclusively focused on Bk-AE secondarily to the angiotensin-converting enzyme inhibitor treatment, and the blooming subdivision of the hereditary forms established by the identification of novel causal genes with next-generation sequencing (NGS) technology-based exome studies in genetically undiagnosed patients. Finally, based on the diverse benefits that are offered by the technology, we present arguments favoring the use of holistic NGS approaches as first-tier genetic tests as a promise to reduce the diagnostic odyssey of patients with suspected hereditary forms of Bk-AE.
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Affiliation(s)
- Itahisa Marcelino-Rodriguez
- Research Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Ariel Callero
- Allergy Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Alejandro Mendoza-Alvarez
- Research Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Eva Perez-Rodriguez
- Allergy Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Javier Barrios-Recio
- Allergy Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Jose C. Garcia-Robaina
- Allergy Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Carlos Flores
- Research Unit, Hospital Universitario Nuestra Señora de Candelaria, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
- Instituto Tecnológico y de Energías Renovables (ITER), Genomics Division, Santa Cruz de Tenerife, Spain
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
- Instituto de Tecnologías Biomédicas (ITB), Universidad de La Laguna, Santa Cruz de Tenerife, Spain
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Dias MM, Moreno AS, Maia LSM, Nunes FL, Campos WN, Ferriani MPL, Silva WA, Arruda LK. A cost-effective algorithm for diagnosis of hereditary angioedema with normal C1 inhibitor: Applying molecular approach to clinical practice. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2019; 8:419-421.e4. [PMID: 31319218 DOI: 10.1016/j.jaip.2019.06.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 06/26/2019] [Accepted: 06/28/2019] [Indexed: 10/26/2022]
Affiliation(s)
- Marina M Dias
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Adriana S Moreno
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil; Center for Genomic Medicine, Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Luana S M Maia
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Fernanda Leonel Nunes
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Wagner N Campos
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Mariana P L Ferriani
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Wilson A Silva
- Center for Genomic Medicine, Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil; Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - L Karla Arruda
- Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil; Center for Genomic Medicine, Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
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Bygum A. Hereditary Angio-Oedema for Dermatologists. Dermatology 2019; 235:263-275. [PMID: 31167185 DOI: 10.1159/000500196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 04/08/2019] [Indexed: 11/19/2022] Open
Abstract
Among angio-oedema patients, hereditary angio-oedema (HAE) should not be overlooked. Besides skin swellings, these patients might have very painful abdominal attacks and potentially life-threatening angio-oedema of the upper airway. They will not respond to traditional anti-allergic therapy with antihistamines, corticosteroids, and adrenaline, and instead need specific drugs targeting the kallikrein-kinin pathway. Classically, patients with HAE have a quantitative or qualitative deficiency of the C1 inhibitor (C1INH) due to different mutations in SERPING1, although a new subtype with normal C1INH has been recognised more recently. This latter variant is diagnosed based on clinical features, family history, or molecular genetic testing for mutations in F12, ANGPT1,or PLG.The diagnosis of HAE is often delayed due to a general unfamiliarity with this orphan disease. However, undiagnosed patients are at an increased risk of unnecessary surgical interventions or life-threatening laryngeal swellings. Within the last decade, new and effective therapies have been developed and launched for acute and prophylactic therapy. Even more drugs are under evaluation in clinical trials. It is therefore of utmost importance that patients with HAE are diagnosed as soon as possible and offered relevant therapy with orphan drugs to reduce morbidity, prevent mortality, and improve quality of life.
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Affiliation(s)
- Anette Bygum
- Department of Dermatology and Allergy Centre, Odense University Hospital, Odense, Denmark,
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Veronez CL, Aabom A, Martin RP, Filippelli-Silva R, Gonçalves RF, Nicolicht P, Mendes AR, Da Silva J, Guilarte M, Grumach AS, Mansour E, Bygum A, Pesquero JB. Genetic Variation of Kallikrein-Kinin System and Related Genes in Patients With Hereditary Angioedema. Front Med (Lausanne) 2019; 6:28. [PMID: 30847342 PMCID: PMC6393376 DOI: 10.3389/fmed.2019.00028] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Accepted: 01/30/2019] [Indexed: 12/01/2022] Open
Abstract
Hereditary angioedema (HAE) is an autosomal dominant disease caused by C1-INH deficiency due to mutations in SERPING1 (C1-INH-HAE) in most of the cases, or by specific mutations in factor XII gene, F12 (F12-HAE). Identification of polymorphisms in the genes encoding proteins from key pathways driving HAE can help to understand how genetic diversity contributes to its phenotypic variability. Here, 15 genes related to the Kallikrein-Kinin System (KKS) were analyzed by next generation sequencing in 59 patients with C1-INH-HAE or F12-HAE from Brazil, Denmark and Spain, and 19 healthy relatives in a total of 31 families. We identified 211 variants, from which 23 occurred only in Danish subjects and 79 were found only in Brazilian individuals, resulting in 109/211 variations in common between European and Brazilian population in the HAE families analyzed. BDKRB2 and CPM presented a large number of variants in untranslated regions, 46/49 and 19/24, respectively; whereas ACE (n = 26), SERPING1 (n = 26), CPM (n = 24), and NOS3 (n = 16) genes presented the higher number of variants directly affecting amino acid sequence. Despite the large amount of variants identified, the lack of association between genotype and phenotype indicates that the modulation of HAE symptom requires a more complex regulation, probably involving pathways beyond the KKS, epigenetics and environmental factors. Considering the new HAE types recently described, molecules involved in the regulation of vasculature and in plasminogen activation become promising targets for future genetic studies.
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Affiliation(s)
| | - Anne Aabom
- Department of Dermatology and Allergy Centre, Odense University Hospital, Odense, Denmark
| | - Renan Paulo Martin
- Department of Biophysics, Federal University of São Paulo, São Paulo, Brazil.,Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, United States
| | | | | | - Priscila Nicolicht
- Department of Biophysics, Federal University of São Paulo, São Paulo, Brazil
| | | | - Jane Da Silva
- Department of Medicine, Allergy Clinic of Professor Polydoro Ernani de São Thiago University Hospital, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Mar Guilarte
- Allergy Section, Internal Medicine Department, Hospital Universitari Vall d'Hebron, Barcelona, Spain
| | | | - Eli Mansour
- Department of Internal Medicine, University of Campinas, Campinas, Brazil
| | - Anette Bygum
- Department of Dermatology and Allergy Centre, Odense University Hospital, Odense, Denmark
| | - João Bosco Pesquero
- Department of Biophysics, Federal University of São Paulo, São Paulo, Brazil
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A mechanism for hereditary angioedema with normal C1 inhibitor: an inhibitory regulatory role for the factor XII heavy chain. Blood 2018; 133:1152-1163. [PMID: 30591525 DOI: 10.1182/blood-2018-06-860270] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 12/13/2018] [Indexed: 12/29/2022] Open
Abstract
The plasma proteins factor XII (FXII) and prekallikrein (PK) undergo reciprocal activation to the proteases FXIIa and kallikrein by a process that is enhanced by surfaces (contact activation) and regulated by the serpin C1 inhibitor. Kallikrein cleaves high-molecular-weight kininogen (HK), releasing the vasoactive peptide bradykinin. Patients with hereditary angioedema (HAE) experience episodes of soft tissue swelling as a consequence of unregulated kallikrein activity or increased prekallikrein activation. Although most HAE cases are caused by reduced plasma C1-inhibitor activity, HAE has been linked to lysine/arginine substitutions for Thr309 in FXII (FXII-Lys/Arg309). Here, we show that FXII-Lys/Arg309 is susceptible to cleavage after residue 309 by coagulation proteases (thrombin and FXIa), resulting in generation of a truncated form of FXII (δFXII). The catalytic efficiency of δFXII activation by kallikrein is 15-fold greater than for full-length FXII. The enhanced rate of reciprocal activation of PK and δFXII in human plasma and in mice appears to overwhelm the normal inhibitory function of C1 inhibitor, leading to increased HK cleavage. In mice given human FXII-Lys/Arg309, induction of thrombin generation by infusion of tissue factor results in enhanced HK cleavage as a consequence of δFXII formation. The effects of δFXII in vitro and in vivo are reproduced when wild-type FXII is bound by an antibody to the FXII heavy chain (HC; 15H8). The results contribute to our understanding of the predisposition of patients carrying FXII-Lys/Arg309 to angioedema after trauma, and reveal a regulatory function for the FXII HC that normally limits PK activation in plasma.
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12
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Veronez CL, Moreno AS, Constantino-Silva RN, Maia LS, Ferriani MP, Castro FF, Valle SR, Nakamura VK, Cagini N, Gonçalves RF, Mansour E, Serpa FS, Coelho Dias GA, Piccirillo MA, Toledo E, de Souza Bernardes M, Cichon S, Stieber C, Arruda LK, Pesquero JB, Grumach AS. Hereditary Angioedema with Normal C1 Inhibitor and F12 Mutations in 42 Brazilian Families. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2018; 6:1209-1216.e8. [DOI: 10.1016/j.jaip.2017.09.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 08/29/2017] [Accepted: 09/22/2017] [Indexed: 01/14/2023]
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Magerl M, Germenis AE, Maas C, Maurer M. Hereditary Angioedema with Normal C1 Inhibitor. Immunol Allergy Clin North Am 2017; 37:571-584. [DOI: 10.1016/j.iac.2017.04.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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