Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-18684
Becskei, C; Lutz, T A; Riediger, T (2009). Diet-derived nutrients mediate the inhibition of hypothalamic NPY neurons in the arcuate nucleus of mice during refeeding. American Journal of Physiology. Regulatory, Integrative and Comparative Physiology, 297(1):100-110.
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Fasting activates orexigenic neuropeptide Y neurons in the hypothalamic arcuate nucleus (ARC) of mice, which is reversed by 2h refeeding with standard chow. Here we investigated the contribution of diet-derived macronutrients and anorectic hormones to the reversal of the fasting-induced ARC activation during 2h refeeding. Refeeding of 12h-fasted mice with a cellulose-based, non-caloric mash induced only a small reduction in c-Fos expression. Refeeding with diets, containing carbohydrates, protein or fat alone reversed it similar to chow, however this effect depended on the amount of intake. The fasting-induced ARC activation was unchanged by subcutaneously injected amylin, CCK (both 20 microg/kg), insulin (0.2U/kg and 0.05U/kg) or leptin (2.6mg/kg). Insulin and leptin had no effect on c-Fos expression in neuropeptide Y or proopiomelanocortin containing ARC neurons. Interestingly, CCK but not amylin reduced the ghrelin-induced c-Fos expression in the ARC in ad libitum fed mice suggesting that endogenous CCK may inhibit orexigenic ARC neurons when acting together with other feeding-related signals. We conclude that all three macronutrients and also non-nutritive, ingestion-dependent signals contribute to an inhibition of orexigenic ARC neurons after refeeding. Similar to the previously demonstrated inhibitory in vivo action of peptide YY, CCK may be a postprandial mediator of ARC inhibition. Key words: c-Fos, insulin, leptin, amylin.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||05 Vetsuisse Faculty > Institute of Veterinary Physiology|
04 Faculty of Medicine > Center for Integrative Human Physiology
|DDC:||570 Life sciences; biology|
610 Medicine & health
|Date:||29 July 2009|
|Deposited On:||02 Jun 2009 11:49|
|Last Modified:||23 Nov 2012 16:26|
|Publisher:||American Physiological Society|
|WoS Citation Count:||7|
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