Navigation auf zora.uzh.ch

Search ZORA

ZORA (Zurich Open Repository and Archive)

Blunted fasting-induced hypothalamic activation and refeeding hyperphagia in late-onset obesity

Becskei, C; Lutz, Thomas A; Riediger, Thomas (2009). Blunted fasting-induced hypothalamic activation and refeeding hyperphagia in late-onset obesity. Neuroendocrinology, 90(4):371-382.

Abstract

Hormonal and metabolic factors signal the status of energy balance to hypothalamic nuclei. Obesity is characterized by neuronal, metabolic and hormonal alterations. We therefore hypothesized that hypothalamic responses to challenges of energy balance may differ between lean and obese animals. To test this, we compared c-Fos expression in the hypothalamic arcuate (ARC) and paraventricular nuclei (PVN) and the lateral hypothalamic area (LHA) of mice (1-year-old) with late-onset obesity (LOO) and of lean controls under different feeding conditions. Fourteen hours of fasting induced high c-Fos expression in neuropeptide-Y-positive ARC neurons, in the PVN and in the rostral LHA in lean but not in LOO mice. c-Fos expression in melanin-concentrating hormone (MCH) and orexin-containing neurons in the caudal LHA was not affected by fasting. LOO mice showed fasting hyperinsulinemia, hyperleptinemia, elevated fasting blood glucose and an attenuated hyperphagic response during refeeding. Moreover, the anorectic response to leptin and hypoglycemic response to insulin were reduced in LOO mice. We conclude that adiposity blunts the neuronal responses to metabolic challenges in hypothalamic centers which control feeding behavior and energy balance. Elevated blood glucose may be one factor that suppresses hypothalamic responsiveness in obese mice. A similar impact of hyperinsulinemia and hyperleptinemia in LOO mice is also likely although under the current experimental conditions responsiveness to some effects of these hormones appeared to be reduced.

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinärwissenschaftliches Institut > Institute of Veterinary Physiology
04 Faculty of Medicine > Zurich Center for Integrative Human Physiology (ZIHP)
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Scopus Subject Areas:Health Sciences > Endocrinology, Diabetes and Metabolism
Life Sciences > Endocrinology
Life Sciences > Endocrine and Autonomic Systems
Life Sciences > Cellular and Molecular Neuroscience
Uncontrolled Keywords:* Arcuate nucleus, hypothalamic, , * Paraventricular nucleus, hypothalamic, , * Hypothalamic area, lateral, , * c-Fos, , * Obesity, late-onset
Language:English
Date:21 October 2009
Deposited On:22 Oct 2009 10:18
Last Modified:03 Nov 2024 02:37
Publisher:Karger
ISSN:0028-3835
OA Status:Green
Publisher DOI:https://doi.org/10.1159/000251723
PubMed ID:19844081
Download PDF  'Blunted fasting-induced hypothalamic activation and refeeding hyperphagia in late-onset obesity'.
Preview
  • Content: Published Version

Metadata Export

Statistics

Citations

Dimensions.ai Metrics
18 citations in Web of Science®
18 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

236 downloads since deposited on 22 Oct 2009
38 downloads since 12 months
Detailed statistics

Authors, Affiliations, Collaborations

Similar Publications