title: The mesencephalic trigeminal sensory nucleus is involved in the control of feeding and exploratory behavior in mice.
abstract: The mesencephalic trigeminal nucleus (Me5), which receives input from oral proprioceptors and projects to higher brain regions, is involved in mastication-induced modulation of satiation. To investigate how the Me5 is involved in the control of feeding and exploratory behavior, we examined the effect of bilateral electrolytic lesions of the Me5 on feeding and exploratory behavior in mice. Mouse feeding and exploratory behaviors were analyzed using a food-search-compulsion-apparatus (FSCA), which was designed to distinguish between the two behaviors under standard living conditions. To assess anxiety in mice in an unfamiliar environment, exploratory activity was analyzed in an automated hole-board apparatus. Mice with bilateral Me5 lesions had unique feeding and exploratory behavior profiles in the FSCA compared with sham-operated mice. Me5-lesioned mice spent more time in the food chamber during each trial in the FSCA, but the number of entries into the food chamber was decreased by 40% compared to sham-operated mice. Moreover, Me5 lesions markedly inhibited exploratory behavior, manifested as low-frequency exploration. In spite of the low-frequency exploration in the FSCA, Me5 lesions had no effect on various exploratory activities analyzed in the hole-board apparatus, i.e., total locomotor activity, frequency and duration of rearing and head-dipping, and latency to the first head-dipping. These results suggest that the Me5 is involved in the control of feeding and exploratory behavior through its ascending neuronal pathways in mice without modulating the emotional state.
authors.affiliation: Department of Pathobiological Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan. ishii@obihiro.ac.jp
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Ishii
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Furuoka
authors.forename: Takuya
authors.initials: T
authors.lastname: Itou
authors.forename: Nobuo
authors.initials: N
authors.lastname: Kitamura
authors.forename: Masakazu
authors.initials: M
authors.lastname: Nishimura
mesh_terms: D000367:Age Factors; D000818:Animals; D001522:Behavior, Animal; D001835:Body Weight / Q000502:physiology; D005106:Exploratory Behavior / Q000502:physiology*; D005247:Feeding Behavior / Q000502:physiology*; D007839:Functional Laterality; D008297:Male; D051379:Mice; D014278:Trigeminal Nuclei / Q000502:physiology*