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The Journal of Neuroscience, November 15, 1999, 19(22):9728-9738
A Role for Extracellular Adenosine in Time-Dependent Reversal of Long-Term Potentiation by Low-Frequency Stimulation at Hippocampal CA1 Synapses
Chiung-Chun Huang, Ying-Ching Liang, and Kuei-Sen Hsu Department of Pharmacology, College of Medicine, National Cheng-Kung University, Tainan City, Taiwan 70101
The involvement of adenosine on the development of time-dependent reversal of long-term potentiation (LTP) by low-frequency stimulation (LFS) was investigated at Schaffer collateral-CA1 synapses of rat hippocampal slices. A train of LFS (2 Hz, 10 min, 1200 pulses) had no long-term effects on synaptic transmission but produced lasting depression of previously potentiated responses. This reversal of LTP (depotentiation) was observed when the stimulus was delivered
3 min after induction of LTP. However, application at 10 min after induction had no detectable effect on potentiation. This time-dependent reversal of LTP by LFS appeared to be mediated by extracellular adenosine, because it was mimicked by bath-applied adenosine and was specifically inhibited by the selective A1 adenosine receptor antagonist 8-cyclopentyl-1,3-dipropylxanthine (100 nM). The effect of adenosine could be mimicked by 5-HT1A receptor agonist buspirone, but the LFS-induced depotentiation could not be antagonized by 5-HT1A receptor antagonist NAN-190. The source of extracellular adenosine in response to LFS appeared to be attributable to the efflux of cAMP. In addition, this LFS-induced depotentiation was blocked by bath application of adenylyl cyclase activator forskolin or injection of a cAMP analog Sp-adenosine cAMP (10 mM) into postsynaptic neurons. Moreover, the selective protein phosphatase 1 and 2A inhibitors okadaic acid and calyculin A prevented the LFS-induced depotentiation. These results thus suggest that increasing extracellular adenosine appears to underlie the LFS-induced depotentiation via acting on the A1 receptor subtype to interrupt the cAMP-dependent biochemical processes leading to the LTP expression.
Key words: adenosine; long-term potentiation (LTP); depotentiation; protein phosphatase; adenylyl cyclase; hippocampus
Copyright © 1999 Society for Neuroscience 0270-6474/99/19229728-11$05.00/0
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