Abstract:
:Past work has demonstrated robust brain changes in cholecystokinin (CCK-8) following social defeat. Here the authors analyzed brain regional, CCK-8, substance P, corticotropin releasing factor (CRF), and neuropeptide Y levels in adult male Long-Evans rats defeated in a resident-intruder social aggression paradigm, as indexed by elevated bites received, freezing, and emission of 20-kHz calls. Brains harvested 6 hr after social defeat were dissected into 12 regions (olfactory bulbs, 3 cortical regions [frontal cortex, cortex above the basal ganglia, cortex above the diencephalon], caudate-putamen, basal forebrain, hypothalamus, hippocampus, thalamus, tectum, tegmentum, and lower brain stem). Neuropeptide radioimmunoassays demonstrated the following statistically significant regional changes in defeated rats as compared with nondefeated rats: CCK-8 was reduced in frontal cortex and cortex overlying diencephalon, the olfactory bulbs, caudate-putamen, hippocampus, tectum, and lower brainstem. Neuropeptide Y was elevated in the caudate-putamen. Substance P was elevated in the cortex over the basal ganglia and decreased in basal forebrain. CRF was diminished in the hippocampus. The results highlight more robust CCK modulation by social defeat as compared with 3 other neuropeptide systems involved in brain emotional regulation.
journal_name
Behav Neuroscijournal_title
Behavioral neuroscienceauthors
Panksepp J,Burgdorf J,Beinfeld MC,Kroes RA,Moskal JRdoi
10.1037/0735-7044.121.6.1364subject
Has Abstractpub_date
2007-12-01 00:00:00pages
1364-71issue
6eissn
0735-7044issn
1939-0084pii
2007-18058-022journal_volume
121pub_type
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