Journal
PROGRESS IN NEURO-PSYCHOPHARMACOLOGY & BIOLOGICAL PSYCHIATRY
Volume 115, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pnpbp.2022.110512
Keywords
Restraint stress; Parvalbumin; Thy1; Basolateral amygdala; Perineuronal nets
Funding
- Spanish Ministry of Science and Innovation [RTI2018-098269-B-I00]
- Generalitat Valenciana [GRISOLIAP//2017/087, PROMETEU/2020/024]
- International Cooperation Program CAPES (Brazilian Federal Agency for Support and Evaluation of Graduate Education within the Ministry of Education of Brazil) at the University of Valencia
- Spanish Ministry of Science, Innovation and Universities [IJCI-2016-27758]
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This study found that a single intense stressful event can produce long-term alterations in the inhibitory circuits of the BLA, especially on PV+ neurons and their plasticity, with a differential impact depending on the sex and the fear-related circuits involved.
The effects of intense stressors can last a long time and may lead to the development of psychiatric disorders, including posttraumatic stress disorder. The basolateral amygdala (BLA) plays a critical role in these diseases and is extremely sensitive to stress. Here, we explored in male and female mice the long-term (35 days) impact of a 24-h restraint stress on BLA circuitry. We used Thy1-YFP mice to discriminate 2 subpopulations of excitatory neurons, which participate in Fear-On (Thy1-) and Fear-Off (Thy1+) circuits. The stress decreased the density of parvalbumin (PV) + inhibitory neurons in both sexes but did not alter their dendritic complexity. We also analyzed the perisomatic input of basket interneurons on Thy1+ and Thy1- neurons, finding sex dependent effects. In males, we did not find alterations in the density of PV+ puncta or in that of cannabinoid receptor 1 (CB1R) + puncta from cholecystokinin+ basket cells. By contrast, in females we found increased the density of PV+ puncta on Thy1+ neurons and reduced on the Thy1-neurons. This adverse experience also reduced in the long term the density of CB1R+ puncta both on Thy1+ and Thy1- cells in females. The expression of the activity marker FosB was not altered in PV+ interneurons and in Thy1+ neurons of stressed animals. The density of perineuronal nets, a specialized region of the extracellular matrix, which covers particularly PV+ interneurons and regulates their connectivity, was increased by stress in male mice. Our findings indicate that a single stressful event can produce long-term alterations in the inhibitory circuits of the BLA, especially on PV+ neurons and their plasticity, and that there is a differential impact depending on the sex and the fear-related circuits involved.
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