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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2013.tde-23052014-101531
Document
Author
Full name
Wilson Mitsuo Tatagiba Kuwabara
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Loureiro, Tatiana Carolina Alba (President)
Campa, Ana
Silva, Silvana Auxiliadora Bordin da
Title in Portuguese
Participação do estresse de retículo endoplasmático no processo de morte celular em neutrófilos de ratos diabéticos.
Keywords in Portuguese
Diabetes mellitus
Apoptose
Expressão gênica
Neutrófilos
Retículo endoplasmático
Abstract in Portuguese
O retículo endoplasmático (RE) vem ganhando evidência quando se trata de morte celular. O acúmulo de proteínas mal formadas inicia a ativação da Unfolded Protein Response (UPR), com a finalidade de manter a homeostasia do RE. Porém, quando o estímulo do estresse perdura por muito tempo e não é resolvido, a UPR pode ativar genes que conduzem à morte celular. Hiperglicemia, presente no diabetes mellitus, induz estresse de RE em vários tipos celulares. Assim, este estudo teve como objetivo investigar o possível envolvimento do estresse do retículo no processo de morte celular em neutrófilos de ratos diabéticos. Nosso estudo revelou que os neutrófilos de ratos diabéticos quando estimulados com PMA apresentam uma maior suscetibilidade à morte devido à ativação de IRE1a e subsequente fosforilação de JNK, redução na interação mitocôndria-RE na MAM e aumento da atividade da caspase-3. Dentre os resultados apresentados, neutrófilos provenientes de animais controle parecem estar protegidos do estresse de RE por apresentar maior expressão de GRP78 e das proteínas da MAM.
Title in English
The role of the endoplasmatic reticulum in the process of death of neutrophils from diabetic rats.
Keywords in English
Diabetes mellitus
Apoptosis
Endoplasmic reticulum
Gene expression
Neutrophils
Abstract in English
Endoplasmic reticulum (ER) has been gaining evidence when it comes to cell death. The accumulation of unfolded proteins initiates the activation of the Unfolded Protein Response (UPR). The UPR may resolve the ER stress by upregulating genes responsible to maintain the ER homeostasis; or it can activate genes that lead to the cell death when the ER disbalance is not solved. Hyperglycemia, one of many symptoms observed is Diabetes, may cause ER stress in various types of cells. Thus, this study aims to investigate the possible involvement of the ER stress in the process of cell death in neutrophils from diabetic rats. In summary, our study found that neutrophils from diabetic rats when stimulated with PMA exhibit greater susceptibility to death due to activation of IRE1a and subsequent phosphorylation of JNK, reduced safety in mitochondria-ER interaction in the MAM compartment and increased caspase-3 activation. Control group seems to be protect against the ER stress by ROS production by higher expression of GRP78 and MAM proteins.
 
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Publishing Date
2014-05-27
 
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