Age-dependent modulation of short-term neuronal dynamics in the dorsal and ventral rat hippocampus
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Published:2022
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Volume:
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ISSN:0214-6282
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Container-title:The International Journal of Developmental Biology
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language:en
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Short-container-title:Int. J. Dev. Biol.
Author:
Trompoukis George,Tsotsokou Giota,Koutsoumpa Andriana,Tsolaki Maria,Vryoni Georgia,Papatheodoropoulos Costas
Abstract
Brain aging is associated with alterations in the behavioral effectiveness to process information, due to mechanisms that are still largely unclear. Short-term neuronal activity dynamics are basic properties of local brain networks profoundly involved in neural information processing. In this study, we investigated the properties of short-term changes of excitatory synaptic transmission and neuronal excitation in the CA1 field of dorsal and ventral hippocampal slices from young adult and aged rats. We found that short-term synaptic plasticity (i.e. short-term dynamics of input to CA1 circuit) does not significantly differ between young and aged dorsal or ventral hippocampus. However, short-term dynamics of hippocampal output markedly differ between young and aged rats. Notably, age-dependent alterations in short-term neuronal dynamics were detected mainly in the dorsal hippocampus. Thus, the dorsal hippocampus of young rats can detect and facilitate transmission of 1-30 Hz input and depress transmission of higher-frequency input. In contrast, the aged dorsal hippocampus appears unable to transmit information in a frequency-dependent discriminatory manner. Furthermore, the amplification of steady-state output at frequencies < 40 Hz is considerably lower in the aged than young dorsal hippocampus. The aged ventral hippocampus did not show major alterations in short-term processing of neural information, though under conditions of intense afferent activation, neuronal output of the ventral hippocampus is depressed at steady-state more in aged than in young rats. These results suggest that aging is accompanied by alterations in neural information processing mainly in the dorsal hippocampus, which displays a narrower dynamic range of frequency-dependent transient changes in neuronal activity in aged compared with young adult rats. These alterations in short-term dynamics may relate to deficits in processing ongoing activity seen in aged individuals.
Subject
Developmental Biology,Embryology
Cited by
1 articles.
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