Inhibiting ventral hippocampal NMDA receptors and Arc increases energy intake in male rats
| Autor: | Reilly C. Hannapel, Janavi Ramesh, Marise B. Parent, Sherri B. Briggs |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Meal Arc (protein) Cognitive Neuroscience digestive oral and skin physiology Hippocampal formation Biology 03 medical and health sciences Cellular and Molecular Neuroscience Glutamatergic 0302 clinical medicine Neuropsychology and Physiological Psychology Postprandial Endocrinology Internal medicine Synaptic plasticity medicine NMDA receptor Ingestion 030217 neurology & neurosurgery |
| Zdroj: | Learning & Memory. 28:187-194 |
| ISSN: | 1549-5485 |
| DOI: | 10.1101/lm.053215.120 |
| Popis: | Research into the neural mechanisms that underlie higher-order cognitive control of eating behavior suggests that ventral hippocampal (vHC) neurons, which are critical for emotional memory, also inhibit energy intake. We showed previously that optogenetically inhibiting vHC glutamatergic neurons during the early postprandial period, when the memory of the meal would be undergoing consolidation, caused rats to eat their next meal sooner and to eat more during that next meal when the neurons were no longer inhibited. The present research determined whether manipulations known to interfere with synaptic plasticity and memory when given pretraining would increase energy intake when given prior to ingestion. Specifically, we tested the effects of blocking vHC glutamatergic N-methyl-D-aspartate receptors (NMDARs) and activity-regulated cytoskeleton-associated protein (Arc) on sucrose ingestion. The results showed that male rats consumed a larger sucrose meal on days when they were given vHC infusions of the NMDAR antagonist APV or Arc antisense oligodeoxynucleotides than on days when they were given control infusions. The rats did not accommodate for that increase by delaying the onset of their next sucrose meal (i.e., decreased satiety ratio) or by eating less during the next meal. These data suggest that vHC NMDARs and Arc limit meal size and inhibit meal initiation. |
| Databáze: | OpenAIRE |
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