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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2018.tde-05022018-092852
Document
Author
Full name
Wilson Mitsuo Tatagiba Kuwabara
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Loureiro, Tatiana Carolina Alba (President)
Campa, Ana
Cipolla Neto, Jose
Martins, Joilson de Oliveira
Pires, Adriana Cristina Levada
Title in Portuguese
Avaliação da ativação de TLR4 e possível correlação com estresse de retículo endoplasmático em neutrófilos no Diabetes mellitus tipo 2.
Keywords in Portuguese
Estresse de retículo endoplasmático
Inflamação
Neutrófilos
TLR4
Abstract in Portuguese
Os receptores toll-like (TLR) reconhecem agentes invasores ou moléculas indicativas de injúria tecidual. Neutrófilos expressam a maioria dos receptores TLR e quando ativados desencadeiam a produção de citocinas e inicia-se o processo inflamatório. A ativação da via de TLR4 promove um aumento do estresse de retículo endoplasmático devido a alta demanda na produção de proteínas, principalmente citocinas e quimiocinas. O objetivo desse trabalho foi avaliar a resposta neutrofílica ao LPS e a interação das vias de TLR4 e UPR frente a duas condições: a obesidade e o diabetes tipo 2 (GK). Wistar alimentados com dieta hiperlipídica apresentaram um quadro de obesidade com diminuição da sensibilidade a insulina, enquanto animais GK apresentaram todo o fenótipo diabético tipo 2. Neutrófilos de animais GK e HFD produziram menos citocinas e migraram menos para o sítio de inflamação por mecanismos distintos. Por fim, neutrófilos dos grupos GK e HFD mostraram-se resistentes ao LPS por deficiência na via do TLR4.
Title in English
Evaluation of the TLR4 activation and its possible correlation with the endoplasmatic reticulum stress in neutrophils in Diabetes mellitus type 2.
Keywords in English
Endoplasmic reticulum stress
Inflammation
Neutrophils
TLR4
Abstract in English
Toll-like receptors (TLRs) recognize invading agents or molecules indicative of tissue injury. Neutrophils express most TLR receptors and when activated trigger the production of cytokines and initiate the inflammatory process. Activation of the TLR4 pathway promotes an increase in endoplasmic reticulum stress due to high demand in the production of proteins, mainly cytokines and chemokines. The aim of this study was to evaluate the neutrophilic response to LPS and the interaction of the TLR4 and UPR pathways in two different conditions: obesity and type 2 diabetes (GK). HFD fed Wistar rats had a decrease in insulin sensitivity, whereas GK animals had the full type 2 diabetic phenotype. Neutrophils from GK and HFD produced lower cytokines and migrated less to the site of inflammation by different mechanisms. Finally, neutrophils from the GK and HFD groups were resistant to LPS because of deficiency in the TLR4 pathway.
 
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Publishing Date
2018-02-05
 
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