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Corpo gorduroso de Lutzomyia longipalpis (D?ptera: Psichodidae: Phlebotominae) / Fat body of Lutzomyia longipalpis sandflies (Diptera: Psychodidae: Phlebotominae)

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Previous issue date: 2016-08-29 / CAPES / The fat body of insects is involved in very important functions. Thus, the fat body, besides acting as a reserve site and synthesis of proteins, carbohydrates and lipids participates in the production of substances with action on the immune system, detoxification, production of eggs, sperm and pheromone. However, the main function of the fat body is the reserve of lipids. The fat body of insects is usually divided into two regions, the visceral fat body, located near the digestive tract, and the parietal fat body, located near the cuticle. The cell types found in the fat body of insects vary, being found only one type in some and more than ten kinds in others. The main cell types found in the fat body of insects are trophocytes, urocytes and oenocytes. The morphology and biochemistry of fat body Lutzomyia longipalpis, the main vector of visceral leishmaniasis in the Americas, was examined by light microscopy, electron microscopy and high-performance thin layer chromatography. Thus, cuts through the abdomen of adult males and females showed that the fatty body is divided into two main components, in accordance with the spatial distribution in the insect's body: one parietal part which is located just under the cuticle and other visceral which is distributed suspended lobes and often associated with tracheas in hemocele. The fat body of L. longipalpis contains only one cell type, trophocyte, which has a large amount of lipid droplets, protein and glycogen granules in their cytoplasm rosettes. The lipid composition varies according to the physiological and insect species. The neutral lipid stored in fat body found more insects is the triacylglycerol. In addition, small amounts of diacylglycerol, steroids, free fatty acids, carotenoids and monoglycerides are carried by lipoforina (major lipoprotein of the insects). The diacylglycerol is derived from triglycerides stored in fat body and is the main form of fatty acid which are recruited to sites of utilization such as flight muscles, for example. Biochemical analysis of the abdominal tergites L. longipalpis males, by high-performance thin layer chromatography, showed the presence of different classes of neutral lipid (mono-, di- and triacylglycerols, fatty acids, cholesterol and esterified cholesterol) and phospholipids (phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, lysophosphatidylcholine) in the fat body. Furthermore, the lipid composition of the abdominal tergites varied, with the highest amount of lipids extracted from the fourth tergite, which has pheromone producing gland. Finally, the main neutral lipid extracted from the fat body of L. longipalpis was the triacylglycerol and the main phospholipid was phosphatidylethanolamine. / O corpo gorduroso dos insetos est? envolvido em fun??es de grande import?ncia. Assim, o corpo gorduroso, al?m de atuar como s?tio de reserva e s?ntese de prote?nas, carboidratos e lip?dios participa da produ??o de subst?ncias com a??o no sistema imune, detoxifica??o, produ??o dos ?vulos, espermatozoides e de ferom?nios. Contudo, a principal fun??o do corpo gorduroso ? a reserva de lip?dios. O corpo gorduroso dos insetos normalmente ? dividido em duas regi?es, o corpo gorduroso visceral, localizado pr?ximo do tubo digestivo, e o corpo gorduroso parietal, localizado pr?ximo da cut?cula. Os tipos celulares encontrados no corpo gorduroso dos insetos variam, sendo encontrado apenas um tipo em alguns e mais de dez tipos em outros. Os principais tipos celulares encontrados no corpo gorduroso dos insetos s?o os trof?citos, ur?citos e os oen?citos. A morfologia e a bioqu?mica do corpo gorduroso de Lutzomyia longipalpis, o principal vetor da leishmaniose visceral nas Am?ricas, foi analisado por microscopia de luz, microscopia eletr?nica e cromatografia em camada fina de alta performance. Assim, cortes atrav?s do abd?men de machos e f?meas adultas mostraram que o corpo gorduroso ? dividido em dois componentes principais, de acordo com a distribui??o espacial no corpo do inseto: uma parte parietal que est? localizada logo abaixo da cut?cula, e outra visceral que est? distribu?da em l?bulos suspensos e frequentemente associado a traqueias na hemocele. O corpo gorduroso de L. longipalpis cont?m somente um tipo celular, o trof?cito, o qual possui grande quantidade de got?culas de lip?dios, gr?nulos de prote?na e rosetas de glicog?nio em seu citoplasma. A composi??o lip?dica varia de acordo com a condi??o fisiol?gica e esp?cie do inseto. O lip?dio neutro estocado mais encontrado no corpo gorduroso de insetos ? o triacilglicerol. Al?m disso, pequenas quantidades de diacilglicerol, esteroides, ?cidos graxos livres, carotenoides e monoacilglicerois s?o transportadas por lipoforina (maior lipoprote?na dos insetos). O diacilglicerol ? derivado de triacilglicerois estocados no corpo gorduroso e constitui a principal forma de acido graxo que s?o mobilizadas para os s?tios de utiliza??o tal como os m?sculos de voo, por exemplo. A an?lise bioqu?mica dos tergitos abdominais de machos de L. longipalpis, atrav?s de Cromatografia em camada fina de alta performance, mostrou a presen?a de diferentes classes de lip?dios neutros (mono-, di- e triacilglicerois, ?cidos graxos, colesterol e colesterol esterificado) e fosfolip?dios (fosfatidilcolina, fosfatidiletanolamina, fosfatidilinositol, lisofosfatidilcolina) no corpo gorduroso. Al?m disso, a composi??o lip?dica entre os tergitos abdominais variou, sendo a maior quantidade de lip?dios extra?dos do quarto tergito, o qual possui gl?ndulas produtoras de ferom?nio. Finalmente, o principal lip?dio neutro extra?do do corpo gorduroso de L. longipalpis foi o triacilglicerol e o principal fosfolip?dio foi a fosfatidiletanolamina.

Identiferoai:union.ndltd.org:IBICT/oai:localhost:jspui/2069
Date29 August 2016
CreatorsBRETAS, Jorge Ant?nio Casagrande
ContributorsMallet, Jacenir Reis dos Santos, Mallet, Jacenir Reis dos Santos, Feder, Maria Denise, Freitas, Simone Carneiro de, Gomes, Suzete Ara?jo Oliveira, Silva Junior, Renato da
PublisherUniversidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Biologia Animal, UFRRJ, Brasil, Instituto de Ci?ncias Biol?gicas
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ
Rightsinfo:eu-repo/semantics/openAccess
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