Abstract：
:The isomorphism of dorsal periaqueductal gray-evoked defensive behaviors and panic attacks was appraised in the present study. Thresholds of electrically induced immobility, trotting, galloping, jumping, exophthalmus, micturition and defecation were recorded before and after acute injections of anxiolytic, anxiogenic and antidepressant drugs. Antidepressant effects were further assessed 24h after injections of 7-14- and 21-day treatments. Chronic administration of clomipramine (CLM, 5-10mg/kg) a clinically effective antipanic drug increased the thresholds of immobility (24%), trotting (138%) galloping (75%), jumping (45%) and micturition (85%). The 21-day treatment with fluoxetine (FLX, 1mg/kg) virtually abolished galloping without changing the remaining responses. Galloping thresholds were also increased by 5mg/kg acute injections of CLM (19%) and FLX (25%). In contrast, chronically administered maprotiline (10mg/kg), a noradrenaline (NE) selective reuptake inhibitor, selectively increased the thresholds of immobility (118%). Diazepam (1.8mg/kg) and midazolam (MDZ, 2.5mg/kg) failed in attenuating the somatic defensive responses. Yet, the sedative dose of MDZ (5mg/kg) attenuated immobility. The panicogenic drug, pentylenetetrazole (50mg/kg), markedly decreased the thresholds of galloping (-51%) and micturition (-66%). These results suggest that whereas immobility is a NE-mediated attentional response, galloping is the panic-like behavior best candidate.
journal_name
Neurosci Biobehav Revjournal_title
Neuroscience and biobehavioral reviewsauthors
Schenberg LC,Bittencourt AS,Sudré EC,Vargas LCdoi
10.1016/s0149-7634(01)00060-4subject
Has Abstractpub_date
2001-12-01 00:00:00pages
647-59issue
7-8eissn
0149-7634issn
1873-7528pii
S0149763401000604journal_volume
25pub_type
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