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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2011.tde-10022012-111330
Document
Author
Full name
Vivian Almeida Paschoal
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Curi, Rui (President)
Gorjão, Renata
Lima, Fabio Bessa
Title in Portuguese
Efeito comparativo dos ácidos eicosapentaenóico (EPA) e docosa-hexaenóico (DHA) sobre a função de neutrófilos.
Keywords in Portuguese
Ácidos eicosanóicos
Ácidos graxos
Fagocitose
Fungicidas
Leucócitos
Neutrófilos
Abstract in Portuguese
Os efeitos de EPA e DHA sobre a função de neutrófilos foram comparados. Para isso, foram realizados experimentos em neutrófilos isolados de ratos. Foram analisadas células com a membrana plasmática íntegra e fragmentação de DNA com o intuito de determinar as concentrações não tóxicas de EPA e DHA. Aumento da produção de peróxido de hidrogênio ocorreu a partir de concentrações menores de DHA (50 mM comparado com 100 mM de EPA). Já para a produção de ânion superóxido, EPA estimulou em doses menores (12.5 mM e o DHA em 100 mM). Ambos AGs aumentaram a síntese e liberação das citocinas CINC-2 e TNF-α e não modificaram a produção de IL1-b e óxido nítrico após incubação das células por 18 horas. Somente DHA elevou a capacidade fagocitária e a atividade fungicida dos neutrófilos. EPA e DHA apresentaram efeitos distintos na produção de citocinas, fagocitose e atividade fungicida dos neutrófilos. Já na produção das EROS, EPA e DHA apresentaram efeitos similares, embora em concentrações diferentes.
Title in English
Comparative effect of eicosapentaenoic (EPA) and docosa-hexaenoic (DHA) acids on neutrophil function.
Keywords in English
Eicosanoic acids
Fatty acids
Fungicide
Leukocytes
Neutrophils
Phagocytosis
Abstract in English
The effects of eicosapentaenoic (EPA) and docosahexaenoic (DHA) on neutrophil function were compared. For this purpose, experiments were performed in isolated rat neutrophils. Cells with intact plasma membrane and DNA fragmentation were analyzed in order to determine the non-toxic concentrations of EPA and DHA. Production of H2O2 was increased in lower concentrations of DHA (50 mM compared to 100 mM of EPA). For production of O2 -, EPA stimulated at lower doses (12.5 mM compared to 100 mM of DHA). Both FAs increased synthesis and release of cytokines, CINC-2 and TNF-α, and did not change the production of IL-1b and nitric oxide after incubation of the cells for 18 hours. Only DHA increased the phagocytic capacity and fungicidal activity of neutrophils. These FAs showed distinct effects on cytokine production, phagocytosis capacity and fungicidal activity by neutrophils. For production of ROS, both EPA and DHA had similar actions, although at different concentrations.
 
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Publishing Date
2012-03-14
 
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