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Synaptic Stress, Changes in Glutamate Transmission and Circuitry, and Psychopathology

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Abstract

Dysfunction of the glutamate system is increasingly considered a core feature of stress-dependent neuropsychiatric disorders. Clinical neuroimaging studies have shown consistent volumetric changes in limbic and cortical areas, while preclinical studies with stress protocols in rodents found dendritic remodeling and reduction of synapses in the same areas, suggesting that destabilization of glutamate release/transmission, in turn induced by stress and glucocorticoids, is crucial for cognitive function and neural architecture. We found that acute stress rapidly enhances depolarization-evoked glutamate release/transmission in prefrontal and frontal cortex (PFC/FC), an effect mediated by stimulation of synaptic corticosterone receptors. Corticosterone rapidly increases the readily releasable pool of glutamate vesicles, through activation of synaptic receptor-mediated nongenomic mechanisms in PFC/FC. Moreover, we have shown that chronic antidepressants are able to prevent the enhancement of glutamate release induced by acute stressors in these areas.

While the predominant effect of acute stress is an enhancement of synaptic transmission, repeated exposure to stress brings about atrophy and remodeling of dendrites, loss of synapses, and reduction of synaptic transmission (except perhaps in amygdala). Understanding the mechanisms and effectors involved in this biphasic action of stress is essential to the development of new diagnostic and therapeutic means for stress-related disorders. Select brain-derived neurotrophic factor (BDNF) transcripts and their translation at synapses could be among these key effectors.

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Musazzi, L., Treccani, G., Perego, C., Nava, N., Nyengaard, J., Popoli, M. (2014). Synaptic Stress, Changes in Glutamate Transmission and Circuitry, and Psychopathology. In: Popoli, M., Diamond, D., Sanacora, G. (eds) Synaptic Stress and Pathogenesis of Neuropsychiatric Disorders. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1056-4_3

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