Bruce S. McEwen, John H. Morrison  Neuron 

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The Brain on Stress: Vulnerability and Plasticity of the Prefrontal Cortex over the Life Course  Bruce S. McEwen, John H. Morrison  Neuron  Volume 79, Issue 1, Pages 16-29 (July 2013) DOI: 10.1016/j.neuron.2013.06.028 Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 1 Neurons and Circuits Mediating Spatial Working Memory in PFC The neuronal response properties and neural circuitry underlying spatial working memory task as envisioned by Goldman-Rakic and colleagues (Arnsten et al., 2010; Goldman-Rakic, 1995). (A) The oculomotor delayed response (ODR) task, which is a test of spatial working memory as mediated by Brodmann area 46 in the dlPFC of the monkey. (B) Area 46, delineated in red surrounding the principal sulcus. The electrophysiological response properties depicted in (C) are generated from recordings of pyramidal neurons within this region. PS, principal sulcus; AS, arcuate sulcus. (C) Recordings from a representative neuron in area 46 with spatially tuned firing during the delay period of the ODR task. For details, see Wang et al. (2011). (D) The PFC microcircuits subserving spatially tuned firing during the delay period in a spatial working memory task. Brown neurons designated by B and C represent GABAergic neurons innervating pyramidal neurons mediating working memory. The red circuit on the left represents the noradrenergic inputs modulating α2A receptors on the pyramidal neurons, and the blue circuit on the right depicts the dopaminergic inputs acting through D1 receptors. From Arnsten et al. (2010) with permission. Neuron 2013 79, 16-29DOI: (10.1016/j.neuron.2013.06.028) Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 2 Schematic Diagrams Depicting Dendritic Shrinkage and Expansion in Response to Chronic Stress and Recovery Top: chronic stress leads to dendritic shrinkage in layer 3 pyramidal neurons in the prelimbic and anterior cingulate cortex, whereas it causes dendritic expansion in the corresponding neurons within orbitofrontal cortex. Both effects are seen primarily in the distal apical dendritic tree. Bottom: while shrinkage and recovery both affect distal dendrites in neurons depicted in the top panel, layer 5 neurons in infralimbic cortex lose distal dendritic branches in response to stress, yet recovery occurs primarily in proximal dendrites, shifting the dendritic architecture (see text for details). Neuron 2013 79, 16-29DOI: (10.1016/j.neuron.2013.06.028) Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 3 Schematic Diagrams Depicting the Interactive Effects between Stress and Aging on Layer 3 Pyramidal Neurons in the Prelimbic Area of mPFC The effects on dendritic arbor (A) and the effects on spines (B). In both cases, the top panel represents young male rats, the middle panel represents middle-aged rats, and the bottom panel represents aged rats. (A) In young animals, chronic stress leads to shrinkage of distal apical dendrites. After cessation of chronic stress, dendritic trees regrow. Such recovery after stress cessation is blunted by middle age and is gone in the aged animals. (B) Spines are also lost in young animals exposed to chronic stress, and it is primarily the thin spines that are affected. No further spine loss is induced by stress in middle-aged or aged rats, and this is likely due to the fact that age on its own leads to a loss of the thin spine class (see text for details). Neuron 2013 79, 16-29DOI: (10.1016/j.neuron.2013.06.028) Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 4 Interactive Effects of Stress and Estrogen on Neurons within Layer 3 of Infralimbic Cortex Schematic depicting a three-way interaction between stress, estrogen, and circuit specificity in female rats. (A) Chronic stress increased dendritic arbor in layer 3 neurons in IL neurons that project to amygdala, whereas this is not the case with the general population of layer 3 pyramidal neurons (data not shown). Furthermore, in OVX females, this effect is only seen if the rat receives estrogen treatment. (B) Schematic representation of the different effects of estrogen on stress-induced spine formation in the female rat PFC in cortically projecting and amygdala-projecting neurons. On left, for cortically projecting neurons, chronic stress induces spine formation in OVX females but fails to do so in OVX females treated with estrogen; on right, for amygdala-projecting neurons, chronic stress induces spine formation in OVX females and estrogen treatment increases spine density in nonstressed animals and promotes further spinogenesis in chronically stressed estrogen-treated OVX females. These dendritic and spine effects differ from those seen in males. Neuron 2013 79, 16-29DOI: (10.1016/j.neuron.2013.06.028) Copyright © 2013 Elsevier Inc. Terms and Conditions