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Chronic cold stress increases excitatory effects of norepinephrine on spontaneous and evoked activity of basolateral amygdala neurons.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Buffalari, Deanne Marie Grace, Anthony A. |
| Copyright Year | 2009 |
| Abstract | Neurons of the amygdala respond to a variety of stressors. The basolateral amygdala (BLA) receives dense norepinephrine (NE) innervation from the locus coeruleus, and stressful and conditioned stimuli cause increases in NE levels within the BLA. Furthermore, chronic stress exposure leads to sensitization of the stress response. The actions of NE in different structures involved in the stress circuit have been shown to play a role in this sensitization response. Here, we examine how chronic cold stress alters NE modulation of spontaneous and evoked activity in the BLA. In controls, NE inhibited spontaneous firing in the majority of BLA neurons, with some neurons showing excitation at lower doses and inhibition at higher doses of NE. NE also decreased the responsiveness of these neurons to electrical stimulation of the entorhinal and sensory association cortices. After chronic cold exposure, NE caused increases in spontaneous activity in a larger proportion of BLA neurons than in controls, and now produced a facilitation of responses evoked by stimulation of entorhinal and sensory association cortical inputs. These studies show that chronic cold exposure leads to an increase in the excitatory effects of NE on BLA neuronal activity, and suggest a mechanism by which organisms may display an enhancement of hormonal, autonomic, and behavioural responses to acute stressful stimuli after chronic stress exposure. |
| Starting Page | 95 |
| Ending Page | 107 |
| Page Count | 13 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://pdfs.semanticscholar.org/65a5/6591ae14b044851b130aaa2f972744577ac3.pdf |
| Alternate Webpage(s) | http://ijnp.oxfordjournals.org/content/ijnp/12/1/95.full.pdf |
| Alternate Webpage(s) | https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/ijnp/12/1/10.1017/S1461145708009140/2/12-1-95.pdf?Expires=1497854278&Key-Pair-Id=APKAIUCZBIA4LVPAVW3Q&Signature=JvPwPjURIV4aKS-E78JV4tYlYfQPz3HbZ3CJDVNN1PjI5l6ZmnQk9aXNfZzliuSFrl0~e3O6HaaS1IZWs6qDYfjRjULfBxvca5jwckNDEnjjoZl5TysXOR37i4EoW3WI6WhPTkCtXuWQ0ah8GhHJpZMekg7ZoQPKCoWNoNUMblz9sTVYFOMW-sgwIi1Bg0-aVL90x17BPD6BwsWQ8K1c5VFcfADzN-V3ZPqJXhMS3y8Uetx~Mms3w5eW05etZ-eo8xyPgJkd8w6Wcygi87tRo1jecpxzNh~gb7O5pzy8EFOH7l5zN8cZMu13zba6h4Cje6TbHb6CtZyvtyEpt6jN5w__ |
| PubMed reference number | 18647435v1 |
| Alternate Webpage(s) | https://doi.org/10.1017/S1461145708009140 |
| DOI | 10.1017/s1461145708009140 |
| Journal | The international journal of neuropsychopharmacology |
| Volume Number | 12 |
| Issue Number | 1 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Amygdaloid structure Biologics License Application Electric stimulation technique Excitation Large Norepinephrine Sensitization (observable entity) Set of basolateral nuclei of amygdala Structure of locus ceruleus biological adaptation to stress central amygdalar nucleus facilitation nerve supply |
| Content Type | Text |
| Resource Type | Article |
