Requirements for LTP induction by pairing in hippocampal CA1 pyramidal cells

被引:45
|
作者
Chen, HX [1 ]
Otmakhov, N [1 ]
Lisman, J [1 ]
机构
[1] Brandeis Univ, Dept Biol, Volen Ctr Complex Syst, Waltham, MA 02454 USA
关键词
D O I
10.1152/jn.1999.82.2.526
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The induction of long-term potentiation (LTP) in the hippocampal CA1 region requires both presynaptic activity and large postsynaptic depolarization. A standard protocol for inducing LTP using whole-cell recording is to pair low-frequency synaptic stimulation (100-200 pulses, 1-2 Hz) with a depolarizing voltage-clamp pulse (1-3 min duration). In this standard protocol, a Cs+-based internal solution is used to improve the fidelity of the depolarization produced by voltage-clamp. In an attempt to induce LTP more rapidly, we tried to induce LTP by pairing high-frequency stimulation (200 pulses, 20-100 Hz) with a short depolarization (similar to 15 s). Surprisingly, we found that this protocol failed to induce LTP, even though large LTP (similar to 300% of baseline) could be induced by a subsequent standard protocol in the same cell. Pairing brief high-frequency stimulation at the beginning of a long depolarization (3 min) also did not induce LTP. However, the same high-frequency stimulation at the end of the long depolarization did induce LTP. When similar experiments were done with a K+-based internal solution, pairing high-frequency stimulation with a short depolarization did induce LTP. This indicates that the requirement for long depolarization is related to the use of Cs+. We speculate that, when recording is made with Cs+, a tetanus given at the beginning of depolarization initiates a process that inhibits N-methyl-D-aspartate (NMDA)-dependent LTP. This inhibitory process itself decays away during prolonged depolarization.
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收藏
页码:526 / 532
页数:7
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