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Brief exposure to conditions that generate free radicals inhibits synaptic transmission in hippocampal slices, most likely via a presynaptic mechanism. Because other physiologically stressful conditions that generate free radicals, such as hypoxia or ischemia, stimulate the release of adenosine from brain slices, we determined whether increases in extracellular adenosine mediate the presynaptic inhibition...
We describe how endogenous adenosine can prevent the induction of homosynaptic long-term depression (LTD) in the CA1 region of slices of adult rat hippocampus. Neither of two consecutive periods of prolonged low frequency stimulation (LFS; 1 Hz, 900 stimuli) of the Schaffer collateral-commissural fibres resulted in the induction of LTD in the CA1 region of hippocampal slices from adult (8–30 week)...
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