Hypothalamic hormone deficiency enables physiological anorexia in ground squirrels during hibernation.

Autor: Mohr SM; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA., Dai Pra R; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA., Platt MP; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA., Feketa VV; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA., Shanabrough M; Department of Comparative Medicine, Yale University School of Medicine, 310 Cedar Street, New Haven, CT, 06510, USA., Varela L; Department of Comparative Medicine, Yale University School of Medicine, 310 Cedar Street, New Haven, CT, 06510, USA.; Laboratory of Glia-Neuron Interactions in the Control of Hunger. Achucarro_Basque Center for Neuroscience, 48940, Leioa, Vizcaya, Spain.; IKERBASQUE, Basque Foundation for Science, 48009, Bilbao, Vizcaya, Spain., Kristant A; Department of Comparative Medicine, Yale University School of Medicine, 310 Cedar Street, New Haven, CT, 06510, USA., Cao H; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA.; Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA., Merriman DK; Department of Biology, University of Wisconsin-Oshkosh, 800 Algoma Boulevard, Oshkosh, WI, 54901, USA., Horvath TL; Department of Comparative Medicine, Yale University School of Medicine, 310 Cedar Street, New Haven, CT, 06510, USA.; Laboratory of Glia-Neuron Interactions in the Control of Hunger. Achucarro_Basque Center for Neuroscience, 48940, Leioa, Vizcaya, Spain.; IKERBASQUE, Basque Foundation for Science, 48009, Bilbao, Vizcaya, Spain., Bagriantsev SN; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA. slav.bagriantsev@yale.edu., Gracheva EO; Department of Cellular and Molecular Physiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA. elena.gracheva@yale.edu.; Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA. elena.gracheva@yale.edu.; Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06510, USA. elena.gracheva@yale.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Jul 10; Vol. 15 (1), pp. 5803. Date of Electronic Publication: 2024 Jul 10.
DOI: 10.1038/s41467-024-49996-2
Abstrakt: Mammalian hibernators survive prolonged periods of cold and resource scarcity by temporarily modulating normal physiological functions, but the mechanisms underlying these adaptations are poorly understood. The hibernation cycle of thirteen-lined ground squirrels (Ictidomys tridecemlineatus) lasts for 5-7 months and comprises weeks of hypometabolic, hypothermic torpor interspersed with 24-48-h periods of an active-like interbout arousal (IBA) state. We show that ground squirrels, who endure the entire hibernation season without food, have negligible hunger during IBAs. These squirrels exhibit reversible inhibition of the hypothalamic feeding center, such that hypothalamic arcuate nucleus neurons exhibit reduced sensitivity to the orexigenic and anorexigenic effects of ghrelin and leptin, respectively. However, hypothalamic infusion of thyroid hormone during an IBA is sufficient to rescue hibernation anorexia. Our results reveal that thyroid hormone deficiency underlies hibernation anorexia and demonstrate the functional flexibility of the hypothalamic feeding center.
(© 2024. The Author(s).)
Databáze: MEDLINE