Enhancing hepatic glycolysis reduces obesity: differential effects on lipogenesis depend on site of glycolytic modulation.
Reducing obesity requires an elevation of energy expenditure and/or a suppression of food intake. Here we show that enhancing hepatic glycolysis reduces body weight and adiposity in obese mice. Overexpression of glucokinase or 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase is used to increase hepatic glycolysis. Either of the two treatments produces similar increases in rates of fatty acid oxidation in extrahepatic tissues, i.e., skeletal muscle, leading to an elevation of energy expenditure. However, only 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase overexpression causes a suppression of food intake and a decrease in hypothalamic neuropeptide Y expression, contributing to a more pronounced reduction of body weight with this treatment. Furthermore, the two treatments cause differential lipid profiles due to opposite effects on hepatic lipogenesis, associated with distinct phosphorylation states of carbohydrate response element binding protein and AMP-activated protein kinase. The step at which hepatic glycolysis is enhanced dramatically influences overall whole-body energy balance and lipid profiles.
Wu
Chaodong
C
Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Kang
Johnthomas E
JE
Peng
Li-Jen
LJ
Li
Honggui
H
Khan
Salmaan A
SA
Hillard
Christopher J
CJ
Okar
David A
DA
Lange
Alex J
AJ
D000273:Adipose Tissue / Q000378:metabolism; D000818:Animals; D001835:Body Weight; D002478:Cells, Cultured; D004435:Eating; D004734:Energy Metabolism; D005941:Glucokinase / Q000235:genetics / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006019:Glycolysis; D022781:Hepatocytes / Q000166:cytology / Q000378:metabolism*; D006706:Homeostasis; D007328:Insulin / Q000097:blood; D050356:Lipid Metabolism; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009765:Obesity / Q000378:metabolism*; D025481:Phosphofructokinase-2 / Q000235:genetics / Q000378:metabolism; D051381:Rats
D007328:Insulin; D025481:Phosphofructokinase-2; D005941:Glucokinase; D005947:Glucose