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REACTIVE OXYGEN SPECIES SCAVENGING BY CATALASE IS IMPORTANT FOR FEMALE LUTZOMYIA LONGIPALPIS FECUNDITY AND MORTALITY
Fêmeas
Espécies reativas de oxigênio
Catalase
Fecundidade
Mortalidade
Reactive Oxygen Species
Catalase
Female
Mortality
Fecundity
Autor
Afiliación
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil / Instituto Nacional de Ciência e Tecnologia – Entomologia Molecular. Rio de Janeiro, RJ, Brasil.
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil / Instituto Nacional de Ciência e Tecnologia – Entomologia Molecular. Rio de Janeiro, RJ, Brasil.
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Liverpool School of Tropical Medicine, Vector Group. Liverpool. United Kingdom.
Resumen en ingles
The phlebotomine sand fly Lutzomyia longipalpis is the most important vector of American visceral leishmaniasis (AVL), the disseminated and most serious form of the disease in Central and South America. In the natural environment, most female L. longipalpis are thought to survive for less than 10 days and will feed on blood only once or twice during their lifetime. Successful transmission of parasites occurs when a Leishmania-infected female sand fly feeds on a new host. Knowledge of factors affecting sand fly longevity that lead to a reduction in lifespan could result in a decrease in parasite transmission. Catalase has been found to play a major role in survival and fecundity in many insect species. It is a strong antioxidant enzyme that breaks down toxic reactive oxygen species (ROS). Ovarian catalase was found to accumulate in the developing sand fly oocyte from 12 to 48 hours after blood feeding. Catalase expression in ovaries as well as oocyte numbers was found to decrease with age. This reduction was not found in flies when fed on the antioxidant ascorbic acid in the sugar meal, a condition that increased mortality and activation of the prophenoloxidase cascade. RNA interference was used to silence catalase gene expression in female Lu. longipalpis. Depletion of catalase led to a significant increase of mortality and a reduction in the number of developing oocytes produced after blood feeding. These results demonstrate the central role that catalase and ROS play in the longevity and fecundity of phlebotomine sand flies.
Palabras clave en portugues
Lutzomyia LongipalpisFêmeas
Espécies reativas de oxigênio
Catalase
Fecundidade
Mortalidade
Palabras clave en ingles
Lutzomyia LongipalpisReactive Oxygen Species
Catalase
Female
Mortality
Fecundity
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