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• W2018328383 abstract "Abstract Thepresynaptic neuromodulation of stimulation‐evoked release of [ 3 H]‐acetylcholine by endogenous adenosine, via A 1 ‐adenosine receptors, was studied in superfused hippocampal slices taken from 4‐, 12‐ and 24‐month‐old rats. 8‐Cyclopentyl‐1,3‐dimethylxanthine (0.25 μ M), a selective A 1 ‐receptor antagonist, increased significantly the electrical field stimulation‐induced release of [3H]‐acetylcholine in slices prepared from 4‐ and 12‐month‐old rats, showing a tonic inhibitory action of endogenous adenosine via stimulation of presynaptic A 1 ‐adenosine receptors. In contrast, 8‐cyclopentyl‐1,3‐dimethylxanthine had no effect in 24‐month‐old rats. 2‐Chloroadenosine (10 μ M), an adenosine receptor agonist decreased the release of [ 3 H]‐acetylcholine in slices taken from 4‐ and 12‐month‐old rats, and no significant change was observed in slices taken from 24‐month‐old rats. In order to show whether the number/or affinity of the A 1 ‐receptors was affected in aged rats, [ 3 H]‐8‐cyclopentyl‐1,3‐dimethylxanthine binding was studied in hippocampal membranes prepared from rats of different ages. Whereas the B max value was significantly lower in 2‐year‐old rats than in younger counterparts, the dissociation constant (K d ) was not affected by aging, indicating that the density rather than the affinity of adenosine receptors was altered. Endogenous adenosine levels present in the extracellular space were also measured in the superfusate by high performance liquid chromatography (HPLC) coupled with ultraviolet detection, and an age‐related increase in the adenosine level was found. Insummary, our results indicate that during aging the level of adenosine in the extracellular fluid is increased in the hippocampus. There is a downregulation and reduced responsiveness of presynaptic adenosine A 1 ‐receptors, and it seems likely that these changes are due to the enhanced adenosine level in the extracellular space." @default.
• W2018328383 created "2016-06-24" @default.
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• W2018328383 date "1997-10-01" @default.
• W2018328383 modified "2023-10-11" @default.
• W2018328383 title "Age‐dependent changes of presynaptic neuromodulation via A1‐adenosine receptors in rat hippocampal slices" @default.
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• W2018328383 doi "https://doi.org/10.1016/s0736-5748(97)00028-2" @default.
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