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<dc:title xml:lang="fr">Rôle de la prokinéticine-2 dans le tissu adipeux</dc:title>
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<dc:subject xml:lang="fr">Prokinéticine-2</dc:subject>
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<dc:subject xml:lang="fr">Insuline</dc:subject>
<dc:subject xml:lang="fr">Diabète</dc:subject>
<dc:subject xml:lang="fr">Prolifération adipocytaire</dc:subject>
<dc:subject xml:lang="fr">Différenciation adipocytaire</dc:subject>
<dc:subject xml:lang="en">Prokineticin-2</dc:subject>
<dc:subject xml:lang="en">Adipose tissue</dc:subject>
<dc:subject xml:lang="en">Obesity</dc:subject>
<dc:subject xml:lang="en">Insulin</dc:subject>
<dc:subject xml:lang="en">Diabete</dc:subject>
<dc:subject xml:lang="en">Adipocyte proliferation</dc:subject>
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<tef:elementdEntree autoriteExterne="028090942" autoriteSource="Sudoc">Troubles du métabolisme des glucides</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="033521549" autoriteSource="Sudoc">Troubles du métabolisme des lipides</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’obésité est un facteur de risque pour de nombreuses maladies telles que le diabète de type 2 et les maladies cardiovasculaires. La prokinéticine-2 a été caractérisée comme une hormone anorexigène qui joue un rôle dans la régulation de l’appétit et le métabolisme énergétique via une action sur le récepteur PKR2 au niveau centrale.Cette étude consiste à étudier l’implication de la PK2 et de PKR1 dans le tissu adipeux et dans la physiopathologie de l’obésité. Les souris PKR1-/- dans lesquelles le gène codant pour PKR1 est totalement inactivé, présentent une obésité par hyperplasie, du fait de la prolifération des préadipocytes. Les souris PKR1-/- présentent un état diabétique, avec une insensibilité à l’insuline accrue et une forte intolérance au glucose. Les souris aP2-PKR1-/- dans lesquelles PKR1 est spécifiquement inactivé dans le tissu adipeux, présentent, elle aussi, une obésité hyperplasique, due de la prolifération des préadipocytes. In vitro, nos résultats montrent que la PK2 est capable d’inhiber la différenciation des préadipocytes en inhibant la prolifération des préadipocytes lors de la phase d’expansion clonale mitotique. Nos résultats permettent d’envisager un rôle de la PK2 et de son récepteur PKR1 dans le traitement de l’obésité.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Obesity is a risk factor for various disorders such as type 2 diabetes and cardiovascular diseases. The prokineticins, prokineticin-1 and prokineticin-2 bind two similar G protein-coupled receptors, PKR1 and PKR2. Prokineticin-2 is an anorexigenic hormone that plays a role in appetite regulation and energy metabolism, via a direct hypothalamic mechanism. Since adipocytes express mainly PKR1, we investigated the role of PKR1 in adipocyte functions. PKR1-null mutant mice exhibit increased body weight that is due to an increased visceral fat mass. Mutant adipose tissue is characterized by adipocyte hyperplasia due to an increase in number of proliferating preadipocyte. Mutant adipocytes exhibit downregulation of insulin signaling that is associated with glucose and insulin tolerance. Adipocyte-specific aP2-PKR1 knockout mice present also an increased visceral adipose tissue that lead to a slight increased body weight. Fat mass is also characterized by an hyperplasia and an increased preadipocyte proliferation. This mice present slight metabolic changes. Utilizing 3T3-L1 murine preadipocytes, our study reveals that prokineticin-2 exerts an antiadipogenic function in murine cells. Inhibition of adipogenesis mediated by prokineticin-2 involved PKR1. Prokineticin-2 also inhibits proliferation of preadipocytes. These results suggest that prokineticin-2 via PKR1 signaling plays a crucial role in adipogenesis and adipose tissue hyperplasia.</dcterms:abstract>
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