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Doctoral Thesis
DOI
https://doi.org/10.11606/T.5.2020.tde-16062021-135601
Document
Author
Full name
Diogo Cordeiro de Queiroz Soares
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Kim, Chong Ae (President)
Jorge, Patricia Palmeira Daenekas
Lessa, Ana Lúcia Silveira
Melaragno, Maria Isabel de Souza Aranha
Title in Portuguese
Análise de mediadores solúveis de promoção e supressão da resposta imune em pacientes com a síndrome de deleção 22q11.2
Keywords in Portuguese
Autoimunidade
Imunodeficiência primária
Quimiocinas
Síndrome da Deleção 22q11.2
Síndrome de DiGeorge
Timo
Abstract in Portuguese
INTRODUÇÃO: A síndrome de deleção 22q11.2 (SD22q11.2) é a síndrome de microdeleção mais comum em seres humanos, com uma prevalência estimada de 1:4000 nascidos-vivos. Possui uma ampla variabilidade fenotípica, sendo associada a mais de 180 manifestações distintas. Dentre os achados clínicos, as alterações no sistema imunológico ocorrem em aproximadamente 75% dos casos, podendo se apresentar sob a forma de infecções de repetição, atopia e/ou doenças autoimunes, sugerindo tratar-se de uma doença de desregulação do sistema imune. OBJETIVO: Avaliar mediadores solúveis de promoção e supressão da resposta imune em pacientes com a SD22q11.2. MÉTODOS: Participaram do estudo 15 pacientes com o diagnóstico confirmado de SD22q11.2 e 15 indivíduos saudáveis, sem história familiar de SD22q11.2, malformações congênitas major ou história clínica sugestiva de imunodeficiências. Através da coleta de sangue periférico, foram realizadas análises de mediadores relacionados à regulação do sistema imune, utilizando as técnicas de Cytometric Bead Array (CBA) e enzyme linked immunosorbent assay (ELISA). RESULTADOS: O estudo compreendeu um total de 15 pacientes (15,5 anos ± 8,4; 4 mulheres e 11 homens) com SD22q11.2 e 15 indivíduos saudáveis (17,5 anos ± 7,2; 7 homens e 8 mulheres). Quando comparados os pacientes com SD22q11.2 e os indivíduos saudáveis, observou-se que os pacientes apresentam níveis aumentados de sTREM-1, MCP1, IL8 e níveis reduzidos de sOX40 e RANTES. Quando comparados os pacientes com SD22q11.2 com e sem doença autoimune, observou-se que o grupo com doença autoimune apresenta níveis aumentados de sTREM1, s4-1BB, IP10, RANTES, sPD1 e reduzidos de sOX40 e de sPDL1. CONCLUSÕES: Os pacientes com SD22q11.2 possuem defeitos na produção de mediadores solúveis envolvidos na promoção e supressão da resposta inflamatória, sendo fundamentais para manter a equilíbrio fisiológico do sistema imune, independente de exposição a fatores externos que possam desencadear a ativação da resposta imunológica. Os mediadores avaliados poderão servir como biomarcadores para predição de autoimunidade nos pacientes com SD22q11.2
Title in English
Analysis of soluble mediators of promotion and suppression of the immune response in patients with the 22q11.2 deletion syndrome
Keywords in English
22q11.2 Deletion syndrome
Autoimmunity
Chemokines
DiGeorge syndrome
Primary immunodeficiency
Thymus gland
Abstract in English
INTRODUCTION: 22q11.2 deletion syndrome (22q11.2DS) is the most common human microdeletion syndrome, with an estimated prevalence of 1:4000 live births. It has a wide phenotypic variability, with more than 180 different related manifestations. Among the clinical findings, immune abnormalities are present in approximately 75% of the cases and includes recurrent infections, atopy and/or autoimmune diseases, suggesting that it is a disease of dysregulation of the immune system. OBJECTIVE: to evaluate soluble mediators of promotion and suppression of the immune response in 22q11.2DS patients. METHODS: Fifteen patients with a confirmed diagnosis of 22q11.2DS and 15 healthy patients without a family history of 22q11.2DS, major congenital malformations or a clinical history suggestive of immunodeficiencies were enrolled in the study. Through the sample of peripheral blood, analyzes of mediators related to immune regulation were performed, using techniques of Cytometric Bead Array (CBA) and enzyme-linked immunosorbent assay (ELISA). RESULTS: The study comprised a total of 15 22q11.2DS patients (15.5 years ± 8.4; 4 women and 11 men) and 15 healthy individuals (17.5 years ± 7.2; 7 men and 8 women). When comparing 22q11.2DS patients with healthy individuals, the patients presented higher levels of TREM1, MCP1, IL8 and reduced levels of sOX40 and RANTES. When comparing 22q11.2DS patients with and without autoimmune disease, the group with autoimmune disease has increased levels of sTREM1, s4-1BB, IP10, RANTES, sPD1 and reduced levels of sOX40 and sPDL1. CONCLUSIONS: 22q11.2DS patients have defects in the production of soluble mediators involved in the promotion and suppression of the inflammatory response, being essential to maintain the physiological balance of the immune system, regardless of exposure to external factors that may trigger the activation of the immune response. The mediators evaluated can be used as biomarkers to predict autoimmunity in patients with 22q11.2DS
 
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Publishing Date
2021-06-24
 
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