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A train of low-frequency afferent stimuli (LFS, 1 Hz, 1000 pulses), given 60 min prior to a tetanus (100 Hz, 100 pulses), suppresses the induction of long-term potentiation (LTP) in which a short-term potentiation decreases gradually back to the pre-tetanic level within 40-50 min (LTP suppression). We investigated the effects of adenosine A1 or A2 receptor antagonists (8-cyclopentyltheophylline (8-CPT)...
The effects of both activation and blockade of dopamine (DA) D1 receptors on long-term depression (LTD) of synaptic transmission were examined in CA1 neurons of rat hippocampal slices. Low frequency stimulation (LFS) consisting of 450 pulses at 1 Hz induced LTD (-14.3%, mean, n = 10) in the slope of the field excitatory postsynaptic potential. SKF-38393 (3-10 μM), an agonist of DA D1 receptors,...
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