Abstract
The prefrontal cortex (PFC) is highly sensitive to the effects of stress, a known risk factor of mood disorders including anxiety and depression. Abnormalities in PFC functioning have been well described in humans displaying stress-induced depressive symptoms, and hypoactivity of the PFC is now recognized to be a key feature of the depressed brain. However, little is known about the causes and mechanisms leading to this altered prefrontal functional activity in the context of stress-related mood disorders. We previously showed that unpredictable chronic mild stress (UCMS) in mice increases prefrontal expression of parvalbumin (PV), an activity-dependent calcium-binding albumin protein expressed in a specific subtype of GABAergic neurons, highlighting a potential mechanism through which chronic stress leads to hypofunction of the PFC. In this study, we aimed to investigate the mechanisms by which chronic stress alters the prefrontal GABA system. We hypothesized that chronic stress-induced enhancement of glutamatergic transmission in the PFC is a crucial contributing factor to changes within the prefrontal GABAergic and, specifically, PV system. BALB/c male and female mice were exposed to daily handling (control) or 2 or 4 weeks of UCMS. Female mice displayed a more severe altered phenotype than males, as shown by increased anxiety- and depressive-like behaviors and deficits in PFC-dependent cognitive abilities, particularly after exposure to 2 weeks of UCMS. This behavioral phenotype was paralleled by a large increase in prefrontal PV messenger RNA (mRNA) and number of PV-expressing neurons, supporting our previous findings. We further showed that the expression of pre- and postsynaptic markers of glutamatergic transmission (VGlut1 presynaptic terminals and pERK1/2, respectively) onto PV neurons was increased by 2 weeks of UCMS in a sex-specific manner; this was associated with sex-specific changes in the mRNA expression of the NR2B subunit of the NMDA receptor. These findings provide evidence of increased glutamatergic transmission onto prefrontal PV neurons, particularly in female mice, which could potentially contribute to their increased PV expression and the extent of their behavioral impairment following UCMS. Finally, our analysis of activity of subcortical regions sending glutamatergic afferents to the PFC reveals that glutamatergic neurons from the basolateral amygdala might be specifically involved in UCMS-induced changes in prefrontal glutamatergic transmission.
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Acknowledgements
We would like to thank Elizabeth Stone for her technical assistance in the animal behavioral testing and video scoring. We are also grateful to the laboratory animal technician team for animal husbandry.
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All procedures described here were approved by The Ohio State University Office of Responsible Research Practices and conformed to the US National Institutes of Health Guide for the Care and Use of Laboratory Animals.
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Shepard, R., Coutellier, L. Changes in the Prefrontal Glutamatergic and Parvalbumin Systems of Mice Exposed to Unpredictable Chronic Stress. Mol Neurobiol 55, 2591–2602 (2018). https://doi.org/10.1007/s12035-017-0528-0
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DOI: https://doi.org/10.1007/s12035-017-0528-0