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• W1963921189 abstract "Abstract Memory impairments, which occur regularly across species as a result of ageing, disease (such as diabetes mellitus) and psychological insults, constitute a useful area for investigating the neurobiological basis of learning and memory. Previous studies in rats found that induction of diabetes (with streptozotocin, STZ) impairs long‐term potentiation (LTP) but enhances long‐term depression (LTD) induced by high‐ (HFS) and low‐frequency stimulations (LFS), respectively. Using a pairing protocol under whole‐cell recording conditions to induce synaptic plasticity at Schaffer collateral synapses in hippocampal CA1 slices, we show that LTD and LTP have similar magnitudes in diabetic and age‐matched control rats. But, in diabetic animals, LTD is induced at more polarized and LTP more depolarized membrane potentials ( V ms ) compared with controls: diabetes produces a 10 mV leftward shift in the threshold for LTD induction and 10 mV rightward shift in the LTD–LTP crossover point of the voltage–response curve for synaptic plasticity. Prior repeated short‐term potentiations or LTP are known to similarly, though reversibly, lower the threshold for LTD induction and raise that for LTP induction. Thus, diabetes‐ and activity‐dependent modulation of synaptic plasticity (referred to as metaplasticity) display similar phenomenologies. In addition, compared with naïve synapses, prior induction of LTP produces a 10 mV leftward shift in V ms for inducing subsequent LTD in control but not in diabetic rats. This could indicate that diabetes acts on synaptic plasticity through mechanisms involved in metaplasticity. Persistent facilitation of LTD and inhibition of LTP may contribute to learning and memory impairments associated with diabetes mellitus." @default.
• W1963921189 created "2016-06-24" @default.
• W1963921189 creator A5014777243 @default.
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• W1963921189 creator A5048070562 @default.
• W1963921189 creator A5088342221 @default.
• W1963921189 date "2005-07-01" @default.
• W1963921189 modified "2023-10-10" @default.
• W1963921189 title "Diabetes mellitus concomitantly facilitates the induction of long-term depression and inhibits that of long-term potentiation in hippocampus" @default.
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• W1963921189 doi "https://doi.org/10.1111/j.1460-9568.2005.04205.x" @default.
• W1963921189 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16029206" @default.
• W1963921189 hasPublicationYear "2005" @default.
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