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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2012.tde-20122012-100126
Document
Author
Full name
Francisco Leonardo Tôrres Leal
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Lima, Fabio Bessa (President)
Alaniz, Miriam Helena Fonseca
Anhê, Gabriel Forato
Donato Júnior, José
Silva, Silvana Auxiliadora Bordin da
Title in Portuguese
Leucina intensifica o ganho de adiposidade e as respostas metabólicas do tecido adiposo em ratos previamente obesos por dieta hiperlipídica e a gordura subcutânea é uma das mais afetadas.
Keywords in Portuguese
Ácidos graxos
Gorduras
Insulina
Leucina
Obesidade
Ratos
Abstract in Portuguese
Investigar os efeitos do consumo de leucina sobre a adiposidade e a funcionalidade do tecido adiposo branco em ratos alimentados com dietas controle ou hiperlipídicas (HL). Ratos obesos foram submetidos a 6 semanas de suplementação com leucina. Ao final, podemos observar que a leucina exerceu efeitos distintos, dependente da condição metabólica em vários parâmetros relacionacidos como a adiposidade. Estas respostas foram pronunciadas no grupo de animais alimentados com dieta HL e suplementados com leucina, principalmente pela maior massa adiposa em diferentes coxins adiposos, maior hipertrofia de adipócitos da região subcutânea (SC), incremento na síntese de novo de ácidos graxos em adipócitos SC, bem como, aumento na incorporação de ácidos graxos em adipócitos SC. Além disso, observamos efeitos da leucina sobre a expressão gênica de PPARg, GPAT, FABP e PEPCK no tecido adiposo SC. Assim, foi demonstrado que a leucina quando utilzada em modelo de obesidade e resistência à insulina acaba favorecendo maior incremento da massa de gordura SC via PPARg.
Title in English
Leucine intensifies adiposity and metabolic responses in adipose tissue of previously hyperlipidic diet obese rats, and subcutaneous fat is one of the most affected.
Keywords in English
Fats
Fatty acids
Insulin
Leucine
Obesity
Rats
Abstract in English
Investigate the effects of leucine consumption on adiposity and functionality of white adipose tissue in rats fed with control or hyperlipidic (HL) diets. After obesity characterization, animals were submitted to 6 weeks of leucine supplementation. At the end, we could observe that leucine exerted distinct effects, depending on the metabolic condition in several parameters related to adiposity. These responses were more pronounced in animalsfed with HL diet and supplemented with leucine, mainly due to higher adipose mass in different fat pads, larger adipocytes in subcutaneous fat (SC), increase of de novo fatty acids synthesis, as well as, an increase in fatty acids incorporation in SC adipocytes. Furthermore, we observed effects of leucine supplementation on PPARg, GPAT, FABP and PEPCK gene expression in SC fat. Thus, it was demonstrated that leucine supplementation, when used in an obesity and insulin resistance model, favors the increase of adipose mass in SC fat via PPARg.
 
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Publishing Date
2013-02-07
 
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