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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2023.tde-27092023-145510
Document
Author
Full name
Matheus Garcia de Fragas
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2023
Supervisor
Committee
Câmara, Niels Olsen Saraiva (President)
Mauro, Eliana Faquim de Lima
Silva, Maria Cláudia da
Souto, Fabricio Oliveira
Title in Portuguese
Investigando o papel da ativação dos inflamassomas NLRP1 e CARD8 em modelos de doenças neurodegenerativas
Keywords in Portuguese
Ativação de Macrófagos
Doença de Alzheimer
Encefalomielite Autoimune Experimental
Fagocitose
Inflamassomas
Proteínas Adaptadoras de Sinalização CARD
Abstract in Portuguese
Na doença de Alzheimer, há acúmulo extracelular de beta-amiloide (Aß) em placas e agregação de proteína tau fosforilada em emaranhados neurofibrilares. Como células imunes residentes do sistema nervoso central, a micróglia e macrófagos são responsáveis pela depuração de Aß através da fagocitose e podem orquestrar a resposta inflamatória associada a essa condição (14). A deleção do gene NLRP3 especificamente na micróglia demonstrou melhorar os sintomas cognitivos da doença de Alzheimer em camundongos, e, também, o perfil inflamatório, com redução de IL-1ß e IL-18 e de atividade da caspase-1 (3,5). Utilizando de uma estratégia de bloqueios farmacológicos e silenciamento genético, investigamos a ativação de NLRP1 e CARD8 em macrófagos e foi possível observar que a ativação de CARD8 em células THP-1 diferenciadas por PMA foi capaz de desencadear a produção de IL-1 e aumentou a liberação de caspase-1 clivada e ASC no sobrenadante. O VbP também reduziu a proporção de células com mitocôndrias ativas e a menor respiração mitocondrial, e, curiosamente, isso foi associado à redução da fagocitose de Aß. O silenciamento do inflamassoma CARD8 foi capaz de reverter os efeitos causados pelo tratamento com VbP, confirmando assim que a liberação de IL-1ß, a piroptose, a redução do metabolismo mitocondrial e capacidade fagocítica são resultados da ativação do inflamassoma CARD8. É possível concluir que em macrófagos a ativação do CARD8 é de importância para a função celular e pode ser um futuro alvo de terapias para a doença de Alzheimer.
Title in English
In Alzheimer's disease, there is extracellular accumulation of beta-amyloid (Aß) in plaques and aggregation of phosphorylated tau protein in neurofibrillary tangles
Keywords in English
Alzheimers disease
Autoimmune
CARD Signaling Adaptor Proteins
Encephalomyelitis
Experimental
Inflammasomes
Phagocytosis
Abstract in English
As resident immune cells of the CNS, microglia and macrophages are responsible for Aß clearance through phagocytosis and may orchestrate the inflammatory response associated with this condition (14). The deletion of the NLRP3 gene, specifically in microglia, has been shown to improve the cognitive symptoms of Alzheimer's disease in mice and the inflammatory profile, with a reduction of IL-1ß and IL-18, in addition to reducing the activity of caspase-1(3,5). Using a strategy of pharmacological blocks and genetic silencing, we investigated the activation of NLRP1 and CARD8 in macrophages, and it was possible to observe that the activation of CARD8 in THP-1 cells differentiated by PMA was able to trigger the production of IL-1ß and increased the release of cleaved caspase-1 and ASC into the supernatant. VbP also reduced the proportion of cells with active mitochondria, impaired mitochondrial respiration and, interestingly, this was associated with reduced Aß phagocytosis. The silencing of the CARD8 inflammasome was able to reverse the effects caused by the treatment with VbP, thus confirming that the release of IL-1ß, pyroptosis and the reduction of mitochondrial metabolism and phagocytic capacity are the result of the activation of the CARD8 inflammasome. It is possible to conclude that in macrophages, the activation of CARD8 is important for cell function and may be a future target of therapies for Alzheimer's disease.
 
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Release Date
2025-09-26
Publishing Date
2023-09-28
 
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