Adenosine acts as a neuromodulator in the hippocampus essentially through activation of inhibitory A1 receptors. Using single-cell PCR analysis, we found that CA1 pyramidal cells coexpress A1 receptor mRNA together with that of another adenosine receptor, the A3 receptor. As occurs for the A1 receptor, Western blot analysis indicated that the A3 receptor is also located in hippocampal nerve terminals. However, ...
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