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Master's Dissertation
DOI
10.11606/D.42.2012.tde-23052012-085551
Document
Author
Full name
Gabriela Virginia Moreira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Carvalho, Carla Roberta de Oliveira (President)
Akamine, Eliana Hiromi
Carvalho Filho, Marco Antonio de
Title in Portuguese
Dieta hiperlipídica e envelhecimento modificam a sensibilidade à insulina e a expressão das proteinas relacionadas à via intracelular da insulina em hipotálamo de camundongos fêmeas.
Keywords in Portuguese
Envelhecimento
Hipotálamo
Insulina
Músculo esquelético
Obesidade
Receptores de insulina
Abstract in Portuguese
Em machos, tanto o envelhecimento quanto a obesidade induzida por dieta hiperlipídica (DHL) apresentam defeitos na ação insulínica, no entanto há carência de informações sobre fêmeas. Avaliamos a sensibilidade à insulina, tolerância à glicose, o padrão estral e a expressão de proteínas da via insulínica em hipotálamo e músculo de fêmeas C57BL6. Camundongos com 10 meses de vida e com 4 meses alimentados com DHL apresentaram aumento de coxins gordurosos, resistência à insulina e intolerância à glicose em relação a seus controles. A DHL induziu redução no número de corpos lúteos, precedido de alteração do padrão estral; aumento da expressão do IR e PI3K no hipotálamo e de PI3K/AKT1 e IL-6 em músculo gastrocnêmio. No hipotálamo dos animais com 10 meses foi detectada redução na expressão do IR e TNF alpha. Confirmamos a associação entre obesidade, resistência à insulina e intolerância a glicose induzidas por dieta hiperlipídica e envelhecimento em fêmeas. Além disso, nestes modelos foi detectada modificação na expressão do IR hipotalâmico de modo distinto.
Title in English
High-fat diet and aging impair insulin sensibility and intracellular insulin signaling proteins in hypothalamus of female mice.
Keywords in English
Aging
Hypothalamus
Insulin
Insulin receptors
Obesity
Skeletal muscle
Abstract in English
In males, aging and obesity induced by high-fat diet (HFD) show defects in insulin action, but there is a lack of information about females. We evaluated the insulin sensitivity, glucose tolerance, estrous cycle and proteins expression of the intracellular insulin pathway in the hypothalamus and skeletal muscle of female C57BL6. Ten month-old mice and 4 mo HFD fed mice had increased fat pads, insulin resistance and glucose intolerance. The HFD fed group showed impaired estrous cycle pattern followed by reduced number of corpora lutea. There were also, increased IR and PI3K protein levels in the hypothalamus and increased PI3K/AKT1 and IL-6 proteins in skeletal muscle. In hypothalamus of 10 month-old mice there was a decreased IR and TNF alpha proteins level. Thus, our data confirm the association between obesity, insulin resistance and glucose intolerance induced by HFD and aging in female mice. Moreover, there were distinct change proteins in expression of the hypothalamic IR in both animal models.
 
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Publishing Date
2012-06-01
 
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