Deletion of the gene encoding G0/G 1 switch protein 2 (G0s2) alleviates high-fat-diet-induced weight gain and insulin resistance, and promotes browning of white adipose tissue in mice
Department of Molecular, Cell and Cancer Biology
Cancer Biology | Cell Biology | Lipids | Molecular Biology | Molecular Genetics
AIMS/HYPOTHESIS: Obesity is a global epidemic resulting from increased energy intake, which alters energy homeostasis and results in an imbalance in fat storage and breakdown. G0/G1 switch gene 2 (G0s2) has been recently characterised in vitro as an inhibitor of adipose triglyceride lipase (ATGL), the rate-limiting step in fat catabolism. In the current study we aim to functionally characterise G0s2 within the physiological context of a mouse model.
METHODS: We generated a mouse model in which G0s2 was deleted. The homozygous G0s2 knockout (G0s2 (-/-)) mice were studied over a period of 22 weeks. Metabolic variables were measured including body weight and body composition, food intake, glucose and insulin tolerance tests, energy metabolism and thermogenesis.
RESULTS: We report that G0s2 inhibits ATGL and regulates lipolysis and energy metabolism in vivo. G0s2 (-/-) mice are lean, resistant to weight gain induced by a high-fat diet and are glucose tolerant and insulin sensitive. The white adipose tissue of G0s2 (-/-) mice has enhanced lipase activity and adipocytes showed enhanced stimulated lipolysis. Energy metabolism in the G0s2 (-/-) mice is shifted towards enhanced lipid metabolism and increased thermogenesis. G0s2 (-/-) mice showed enhanced cold tolerance and increased expression of thermoregulatory and oxidation genes within white adipose tissue, suggesting enhanced 'browning' of the white adipose tissue.
CONCLUSIONS/INTERPRETATION: Our data show that G0s2 is a physiological regulator of adiposity and energy metabolism and is a potential target in the treatment of obesity and insulin resistance.
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Citation: Diabetologia. 2015 Jan;58(1):149-57. doi: 10.1007/s00125-014-3429-z. Epub 2014 Nov 9. Link to article on publisher's site
El-Assaad, Wissal; El-Kouhen, Karim; Mohammad, Amro H.; Yang, Jieyi; Morita, Masahiro; Gamache, Isabelle; Mamer, Orval; Avizonis, Daina; Hermance, Nicole M.; Kersten, Sander; Tremblay, Michel L.; Kelliher, Michelle A.; and Teodoro, Jose G., "Deletion of the gene encoding G0/G 1 switch protein 2 (G0s2) alleviates high-fat-diet-induced weight gain and insulin resistance, and promotes browning of white adipose tissue in mice" (2015). Molecular, Cell and Cancer Biology Publications. 20.