Abstract:
BACKGROUND:Chronic stress is a major health concern, often leading to depression, anxiety, or when severe enough, posttraumatic stress disorder. While many studies demonstrate that the amygdala is hyperresponsive in patients with these disorders, the cellular neurophysiological effects of chronic stress on the systems that underlie psychiatric disorders, such as the amygdala, are relatively unknown. METHODS:In this study, we examined the effects of chronic stress on the activity and excitability of amygdala neurons in vivo in rats. We used in vivo intracellular recordings from single neurons of the lateral amygdala (LAT) to measure neuronal properties and determine the cellular mechanism for the effects of chronic stress on LAT neurons. RESULTS:We found a mechanism for the effects of chronic stress on amygdala activity, specifically that chronic stress increased excitability of LAT pyramidal neurons recorded in vivo. This hyperexcitability was caused by a reduction of a regulatory influence during action potential firing, facilitating LAT neuronal activity. The effects of stress on excitability were occluded by agents that block calcium-activated potassium channels and reversed by pharmacological enhancement of calcium-activated potassium channels. CONCLUSIONS:These data demonstrate a specific channelopathy that occurs in the amygdala after chronic stress. This enhanced excitability of amygdala neurons after chronic stress may explain the observed hyperresponsiveness of the amygdala in patients with posttraumatic stress disorder and may facilitate the emergence of depression or anxiety in other patients.
journal_name
Biol Psychiatryjournal_title
Biological psychiatryauthors
Rosenkranz JA,Venheim ER,Padival Mdoi
10.1016/j.biopsych.2010.02.008subject
Has Abstractpub_date
2010-06-15 00:00:00pages
1128-36issue
12eissn
0006-3223issn
1873-2402pii
S0006-3223(10)00128-9journal_volume
67pub_type
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