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Glucose reverses fasting-induced activation in the arcuate nucleus of mice
Csilla Becskei1, Thomas A Lutz, Thomas Riediger
1Institute of Veterinary Physiology and Zurich Centre of Integrative Human Physiology, University of Zurich, Zurich, Switzerland. csillab@vetphys.uzh.ch
Abstract:
The hypothalamic arcuate nucleus is an important target for metabolic and hormonal signals controlling food intake. As demonstrated by c-Fos studies, arcuate neurons are activated in food-deprived mice, whereas refeeding reverses the fasting-induced activation. To evaluate whether an increase in blood glucose has an inhibitory effect on these neurons, we analyzed the c-Fos response to an intraperitoneal glucose injection in fasted mice. This treatment increased blood glucose levels twofold and reduced 2-h food intake. Similar to refeeding, it also reversed the fasting-induced activation in the arcuate nucleus. Therefore, an increase in blood glucose might be an important feeding-related signal acting via the arcuate nucleus to oppose orexigenic stimuli.
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