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• W2152541584 startingPage "14002" @default.
• W2152541584 abstract "Repeated psychosocial or restraint stress causes atrophy of apical dendrites in CA3 pyramidal neurons of the hippocampus, accompanied by specific cognitive deficits in spatial learning and memory. Excitatory amino acids mediate this atrophy together with adrenal steroids and the neurotransmitter serotonin. Because the mossy fibers from dentate granule neurons provide a major excitatory input to the CA3 proximal apical dendrites, we measured ultrastructural parameters associated with the mossy fiber–CA3 synapses in control and 21-day restraint-stressed rats in an effort to find additional morphological consequences of stress that could help elucidate the underlying anatomical as well as cellular and molecular mechanisms. Although mossy fiber terminals of control rats were packed with small, clear synaptic vesicles, terminals from stressed animals showed a marked rearrangement of vesicles, with more densely packed clusters localized in the vicinity of active zones. Moreover, compared with controls, restraint stress increased the area of the mossy fiber terminal occupied by mitochondrial profiles and consequently, a larger, localized energy-generating capacity. A single stress session did not produce these changes either immediately after or the next day following the restraint session. These findings provide a morphological marker of the effects of chronic stress on the hippocampus that points to possible underlying neuroanatomical as well as cellular and molecular mechanisms for the ability of repeated stress to cause structural changes within the hippocampus." @default.
• W2152541584 created "2016-06-24" @default.
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• W2152541584 date "1997-12-09" @default.
• W2152541584 modified "2023-10-18" @default.
• W2152541584 title "Chronic stress alters synaptic terminal structure in hippocampus" @default.
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• W2152541584 doi "https://doi.org/10.1073/pnas.94.25.14002" @default.
• W2152541584 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/28422" @default.
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