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Doctoral Thesis
DOI
10.11606/T.5.2010.tde-07052010-151836
Document
Author
Full name
Ana Carolina Cavalcanti Pessôa de Souza
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Andrade, Lucia da Conceição (President)
Câmara, Niels Olsen Saraiva
Homsi, Eduardo
Moyses, Rosa Maria Affonso
Seguro, Antonio Carlos
Title in Portuguese
Ação protetora da eritropoietina na injúria renal aguda em modelo experimental de sepse
Keywords in Portuguese
Eritropoetina
Insuficiência renal aguda
NF- kappaB
Óxido nítrico sintase tipo III
Ratos Wistar
Sepse
Abstract in Portuguese
A sepse envolve mecanismos complexos de respostas imunológicas e inflamatórias, e o papel do NF- B é essencial. A diminuição da NO sintase endotelial (eNOS) durante a sepse contribui com a disfunção endotelial. A eritropoietina (EPO) é uma citocina protetora de diversos tecidos durante o estresse. Investigamos o papel da EPO na injúria renal aguda (IRA) induzida pela sepse usando o modelo de ligadura e punção do ceco (LPC). Ratos Wistar foram divididos em três grupos: controle; LPC e LPC+EPO (EPO, 4.000UI/kg, administrada 24h e 1h antes da cirurgia). Com a finalidade de estudar os efeitos precoces e tardios da EPO sobre a IRA induzida pela sepse realizamos três etapas de experimentos: Primeira etapa: 24 horas após LPC; Segunda etapa: 48 horas após LPC; Terceira etapa: análise de sobrevida. No estudo precoce o grupo LPC+EPO apresentou clearance de inulina significativamente maior que o grupo LPC. Recuperou os níveis de hematócrito na sepse, melhorou a pressão arterial e a acidose metabólica. No estudo tardio o grupo LPC+EPO apresentou clearance de creatinina significativamente maior que o grupo LPC. Nesta fase tardia a EPO recuperou os níveis de eNOS, suprimiu a infiltração de macrófagos no tecido renal e inibiu a ativação do NF- B. A EPO protege a função renal e aumenta a sobrevida neste modelo de sepse. A proteção da EPO na sepse é dependente, em parte, da inibição do NF- B e do aumento da expressão de eNOS
Title in English
Erithropoietin protects from acute kidney injury in a experimental model of sepsis
Keywords in English
Erythropoietin
NF- kappaB
Nitric oxide synthase type III
Renal insufficiency acute
Sepsis
Wistar rats
Abstract in English
The pathophysiology of sepsis involves complex cytokine and inflammatory mediator networks, a mechanism to which nuclear factor-kappa B (NF- B ) activation is central. Downregulation of endothelial nitric oxide synthase (eNOS) contributes to sepsis-induced endothelial dysfunction. Erythropoietin (EPO) has emerged as a major tissue-protective cytokine in the setting of stress. We investigated the role of EPO in sepsis-related acute kidney injury (AKI) using a cecal ligation and puncture (CLP) model. Wistar rats were divided into three groups: control (sham-operated); CLP-only; and CLP+EPO. The EPO (4000 IU/kg BW, i.p.) was administered 24 h and 1 h before CLP. To study the early and late effects of EPO on sepsis-induced AKI, we performed experiments at 24 h and 48 h after CLP/sham operation, and we plotted the survival curves. At post-procedure hour 24, CLP+EPO rats presented significantly higher inulin clearance than did CLP-only rats; EPO treatment restored hematocrit levels, as well as mean arterial pressure and metabolic balance. At post-procedure hour 48, CLP+EPO rats presented significantly higher creatinine clearance than did CLP-only rats; EPO treatment restored eNOS levels, suppressed macrophage infiltration, and inhibited NF-B activation,thereby increasing survival. In conclusion, EPO protects renal function and increases survival in this model of sepsis-induced AKI. This protection is dependent on eNOS activation and is partly due to inhibition of the inflammatory response via downregulation of NF- B
 
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Publishing Date
2010-05-10
 
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