title: Deletion of Melanin Concentrating Hormone Receptor-1 disrupts overeating in the presence of food cues.
abstract: Exposure to environmental cues associated with food can evoke eating behavior in the absence of hunger. This capacity for reward cues to promote feeding behaviors under sated conditions can be examined in the laboratory using cue-potentiated feeding (CPF). The orexigenic neuropeptide Melanin Concentrating Hormone (MCH) is expressed throughout brain circuitry critical for CPF. We examined whether deletion of the MCH receptor, MCH-1R, would in KO mice disrupt overeating in the presence of a Pavlovian CS+ associated with sucrose delivery. While both wild-type controls and KO mice showed comparable food magazine approach responses during the CPF test, MCH-1R deletion significantly impaired the ability of the CS+ to evoke overeating of sucrose under satiety. Through the use of a refined analysis of meal intake, it was revealed that this disruption to overeating behavior in KO mice reflected a reduction in the capacity for the CS+ to initiate and maintain bursts of licking behavior. These findings suggest that overeating during CPF requires intact MCH-1R signaling and may be due to an influence of the CS+ on the palatability of food and on regulatory mechanisms of peripheral control. Thus, disruptions to MCH-1R signaling may be a useful pharmacological tool to inhibit this form of overeating behavior.
authors.affiliation: Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, United States.
authors.forename: Andrew
authors.initials: A
authors.lastname: Sherwood
authors.affiliation: Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, United States.
authors.forename: Peter C
authors.initials: PC
authors.lastname: Holland
authors.affiliation: Douglas Hospital Research Centre, Department of Psychiatry, McGill University, 6875 LaSalle Boulevard, Montreal, Canada.
authors.forename: Antoine
authors.initials: A
authors.lastname: Adamantidis
authors.affiliation: Department of Psychology and Neuroscience Program, Michigan State University, East Lansing, MI 48824, United States. Electronic address: awj@msu.edu.
authors.forename: Alexander W
authors.initials: AW
authors.lastname: Johnson
mesh_terms: D000818:Animals; D003214:Conditioning, Classical / Q000502:physiology; D003463:Cues; D019422:Dietary Sucrose; D005247:Feeding Behavior / Q000502:physiology* / Q000523:psychology; D005502:Food; D006963:Hyperphagia / Q000503:physiopathology* / Q000523:psychology; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009043:Motor Activity / Q000502:physiology; D009055:Mouth / Q000502:physiology; D017481:Receptors, Somatostatin / Q000172:deficiency* / Q000235:genetics; D012527:Satiation / Q000502:physiology; D017384:Sequence Deletion
chemical_list: D019422:Dietary Sucrose; C491209:Mchr1 protein, mouse; D017481:Receptors, Somatostatin
keywords: Allostasis; Binge eating; Glucose sensing; Lateral hypothalamus; Licking microstructure; Obesity