Chronic social defeat stress induces sustained synaptic structural changes in the prefrontal cortex and amygdala.

Chronic social defeat stress induces sustained synaptic structural changes in the prefrontal cortex and amygdala.
Behav Brain Res. 2019 Jul 10;:112079
Authors: Colyn L, Venzala E, Marco S, Perez-Otaño I, Tordera RM
Abstract
Previous studies show that chronic stress induces synaptic structural alterations in brain regions involved in emotional processing such as the prefrontal cortex (PFC) and the basolateral amygdala (BLA). Yet, these studies are based mainly in animal exposure to unpredictable stressors or to restraint stress. On the other hand, studies using the chronic social defeat stress (CSDS), a relevant model of depression based on social conflict, are lacking. Here we aim to study the acute (24 h after CSDS) and long-term (one month after CSDS) effects of CSDS on dendritic and synaptic structures in the PFC and BLA of C57BL/6 mice. Specifically, BLA and PFC dendritic spine densities as well as BLA arborisation were analysed. Subsequently, we investigate in these regions the synaptic response to a friendly (interaction with a same strain mouse) or a fearful (interaction with a dominant strain mouse) social stimulus. Spine densities of the apical dendrites from the PFC pyramidal neurons were decreased by CSDS in the long-term (one month after CSDS). In addition, CSDS increased BLA stellate neurons spine density in the short-term (24 h after CSDS) and dendritic arborisation in the long-term. Moreover, long-term CSDS mice e...

Source: Behavioural Brain Research - July 9, 2019 Category: Neurology Authors: Colyn L, Venzala E, Marco S, Perez-Otaño I, Tordera RM Tags: Behav Brain Res Source Type: research