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PI3Kγ within a nonhematopoietic cell type negatively regulates diet-induced thermogenesis and promotes obesity and insulin resistance

Becattini, Barbara ; Marone, Romina ; Zani, Fabio ; Arsenijevic, Denis ; Seydoux, Josiane ; Montani, Jean-Pierre ; Dulloo, Abdul G. ; Thorens, Bernard ; Preitner, Frédéric ; Wymann, Matthias P. ; Solinas, Giovanni

In: Proceedings of the National Academy of Sciences of the United States of America, 2011, vol. 108, no. 42, p. E854-E863

Obesity is associated with a chronic low-grade inflammation, and specific antiinflammatory interventions may be beneficial for the treatment of type 2 diabetes and other obesity-related diseases. The lipid kinase PI3Kγ is a central proinflammatory signal transducer that plays a major role in leukocyte chemotaxis, mast cell degranulation, and endothelial cell activation. It was also reported that...

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The direct effect of leptin on skeletal muscle thermogenesis is mediated by substrate cycling between de novo lipogenesis and lipid oxidation

Solinas, Giovanni ; Summermatter, Serge ; Mainieri, Davide ; Gubler, Marcel ; Pirola, Luciano ; Wymann, Matthias P. ; Rusconi, Sandro ; Montani, Jean-Pierre ; Seydoux, Josiane

In: FEBS Letters, 2004, vol. 577, no. 3, p. 539-544

We report here studies that integrate data of respiration rate from mouse skeletal muscle in response to leptin and pharmacological interference with intermediary metabolism, together with assays for phosphatidylinositol 3-kinase (PI3K) and AMP- activated protein kinase (AMPK). Our results suggest that the direct effect of leptin in stimulating thermogenesis in skeletal muscle is mediated by...

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