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P16 AND METABOLISM

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The role of p16INK4a in the development of obesity and insulin resistance

Genome-wide association studies have linked the CDKN2A locus to an increased risk of Type 2 Diabetes (T2D), which is mostly accompanied by insulin resistance (IR) and obesity. The CDKN2A locus encodes p16INK4a, a tumor suppressor.... ver más

01/03/2011

IPL

164K€

Presupuesto del proyecto: 164K€

Líder del proyecto

INSTITUT PASTEUR DE LILLE FONDATION No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2011-03-01 No tenemos la información de la convocatoria

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Líder del proyecto

INSTITUT PASTEUR DE LILLE FONDATION No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 164K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto Genome-wide association studies have linked the CDKN2A locus to an increased risk of Type 2 Diabetes (T2D), which is mostly accompanied by insulin resistance (IR) and obesity. The CDKN2A locus encodes p16INK4a, a tumor suppressor. p16INK4a is an inhibitor of cyclin-dependent kinases, which regulate the cell cycle. Recent studies have shown a link between p16INK4a and the control of inflammation. T2D is an inflammatory disease, in which macrophages are important effector cells. Moreover, adipose tissue macrophages (ATMs) have been found necessary and sufficient for IR to develop. Resident ATMs are known to display an anti-inflammatory M2 phenotype. Upon obesity, a switch towards a pro-inflammatory M1 phenotype has been described, inducing adipocyte dysfunction and systemic IR. Additionally, recent findings from the host laboratory indicate that macrophages lacking p16INK4a exhibit a M2 phenotype. Therefore, we hypothesize that p16INK4a may play a role in the development of IR and obesity, possibly by influencing macrophage polarization. To study the role of macrophage p16INK4a in obesity and IR, we will perform a series of bone marrow transplantation experiments, creating mice that lack p16INK4a immune cells (like ATMs) but not in other cells of the body. Several metabolic parameters, like insulin and glucose tolerance, will be analyzed in vivo. Tissues of these animals will be examined thoroughly on mRNA and protein level. The molecular mechanisms of p16INK4a action on macrophage polarization will be further investigated with microarray analysis of isolated ATMs. In addition, the effects of p16INK4a deficient macrophages on adipocytes will be determined in vitro via direct and indirect co-culture experiments. Finally, using this experimental setup of co-culture, the influence of peroxisome proliferator activated receptors on the interplay between ATMs and adipocytes will be determined.

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