Arquivos de Asma, Alergia e Imunologia
https://www.aaai-asbai.org.br/article/doi/10.5935/2526-5393.20240036
Arquivos de Asma, Alergia e Imunologia
Original Article

Nova proposta para diagnóstico do angioedema hereditário com papel filtro

New diagnostic approach to hereditary angioedema using filter paper

Maine Luellah Demaret Bardou; Rosemeire Navickas Constantino-Silva; Maria Luiza Oliva-Alonso; Ana Júlia Ribeiro Teixeira; Pedro Giavina-Bianchi; Eli Mansour; Solange Oliveira Rodrigues Valle; Anete Sevciovic Grumach

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Resumo

Introdução: O angioedema hereditário (AEH) é raro, caracterizado por edema em subcutâneo, trato gastrointestinal e vias aéreas superiores. A deficiência do inibidor de C1 decorre da mutação em SERPING1 (AEH-C1-INH) que resulta em acúmulo de bradicinina e maior permeabilidade endotelial. O AEH também pode apresentar-se com C1-INH normal. A avaliação funcional do C1- INH permite detectar as duas formas de AEH-C1-INH. O objetivo do estudo foi avaliar a triagem de pacientes usando amostras de gota de sangue seca (DBS - Dried blood spot) em papel filtro comparada à técnica atual por ensaio cromogênico. Métodos: Estudo multicêntrico, prospectivo, em pacientes com AEH subdivididos em: G1 - AEH-C1-INH (n = 53; tipos 1 = 48 e 2 = 5); G2-AEH com mutação de FXII (AEH-FXII) (n = 30) e G3–AEH sem mutação conhecida (AEH-UNK) (n = 10) e G4 - Controle (n = 10). Realizadas dosagens de C4 e C1-INH (imunodifusão radial); C1-INH funcional (ensaio cromogênico e DBS). A avaliação estatística utilizou o programa GraphPad Prism. O protocolo foi aprovado pelo Comitê de Ética (CAAE:41812720010010082). Resultados: Valores de C4 e C1-INHq resultaram em mediana de 9,14 e 8,9 mg/dL para G1; G2 de 33,2 e 34,2 mg/dL; G3 de 35,3 e 29,4 mg/dL e G4 32,2 mg/dL e 35,3 mg/dL respectivamente. Valores de fC1-INH pelo ensaio cromogênico e por DBS resultaram em mediana de 35% e 0% em G1; G2 de 120% e 81%; G3 de 120% e 91%; e em G4 de 32,2% e 35,3%, respectivamente. G1 com 42/53 amostras (79,2%) e 53/53 (100%) com fC1-INH reduzida respectivamente. Em G2 30/30 (100%) e 28/30 (93,7%) com fC1-INH acima de 50% respectivamente. Para G3 e para G4 a fC1-INH estava normal em ambas as técnicas. Conclusão: O fC1-INH pela técnica em DBS permite identificar os pacientes com AEH-C1-INH com maior precisão que o ensaio cromogênico. Trata-se de coleta simples, de fácil transporte, facilitando o diagnóstico de AEH-C1-INH.

Palavras-chave

Angioedema hereditário, inibidor de C1, fator XII, C1-INH, Complemento C4, biomarcador, diagnóstico

Abstract

Introduction: Hereditary angioedema (HAE) is a rare disease characterized by edema in the subcutaneous tissue, gastrointestinal tract, and upper airways. C1 inhibitor deficiency is caused by a SERPING1 mutation (HAE-C1-INH) that results in bradykinin accumulation and increased endothelial permeability. HAE may also present with normal C1-INH. Functional assessment of C1-INH allows the detection of both forms of HAE-C1-INH. This study aimed to evaluate patient screening using dried blood spots (DBS) on filter paper compared with the current technique using chromogenic assays. Methods: A multicenter prospective study of patients with HAE divided into: G1 – HAE-C1-INH (n=53; types 1=48 and 2=5); G2 – HAE with FXII mutation (HAE-FXII) (n=30); G3 – HAE with unknown mutation (HAE-UNK) (n=10); and G4 – Control (n=10). C4 and C1-INH levels were measured (radial immunodiffusion); functional C1-INH levels were assessed using chromogenic assay and DBS. Statistical analysis used GraphPad Prism. The protocol was approved by the Ethics Committee (CAAE:41812720010010082). Results: The median C4 and C1- INHq levels were, respectively, 9.14 and 8.9 mg/dL for G1; 33.2 and 34.2 mg/dL for G2; 35.3 and 29.4 mg/dL for G3; and 32.2 and 35.3 mg/dL for G4. The median fC1-INH levels obtained by chromogenic assay and by DBS were, respectively, 35% and 0% for G1; 120% and 81% for G2; 120% and 91% for G3; and 32.2% and 35.3% for G4. G1 had 42/53 samples (79.2%) and 53/53 (100%) with reduced fC1-INH, respectively. In G2, 30/30 (100%) and 28/30 (93.7%) had fC1-INH above 50%, respectively. In G3 and G4, fC1- INH was normal with both techniques. Conclusion: The fC1-INH measured in DBS samples allows a more precise identification of patients with HAE-C1-INH than using the chromogenic assay. DBS samples are simple to collect and easy to transport, facilitating the diagnosis of HAE-C1-INH.

Keywords

Hereditary angioedema, C1 inhibitor, factor XII, C1- INH, complement C4, biomarker, diagnosis

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Submitted date:
05/30/2024

Accepted date:
08/04/2024

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