Involvement of Thalamic Paraventricular Nucleus in the Anticipatory Reaction under Food Restriction in the Rat

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  • NAKAHARA Keiko
    Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki
  • FUKUI Kento
    Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki
  • MURAKAMI Noboru
    Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki

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  • ラットの制限給餌下での予知反応における視床室傍核の関与

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To investigate which brain regions are involved in the anticipatory activity in rats restricted feeding for 2 hr, we examined c-Fos expression before and after feeding. Only the thalamic paraventricular nucleus (tPVN) showed c-Fos expression before feeding than after feeding. After the anticipatory locomotor activity rhythm was established, lesioning the tPVN attenuated this rhythm, but not the light-dark entrained rhythm. The anticipatory increase of blood corticosterone levels was not established in long-term tPVN-lesioned rats. These results suggest that the tPVN is involved in the expression of anticipatory reactions under a food-restricted regimen.<br>

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