Anti-Hebbian long-term potentiation in the hippocampal feedback inhibitory circuit.

Anti-Hebbian long-term potentiation in the hippocampal feedback inhibitory circuit.
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DOI:
10.1126/science.1137450
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发表时间:
2007-03-02
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Kullmann DM
Kullmann DM
中科院分区:
其他
文献类型:
--
作者:
Lamsa KP;Heeroma JH;Somogyi P;Rusakov DA;Kullmann DM

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长时程增强(LTP)近似于赫布的联想学习假设,通常需要NMDA(N-甲基-d-天冬氨酸)亚型的去极化依赖性谷氨酸受体。然而,在某些神经元中,LTP反而依赖于钙渗透性AMPA型受体。这是自相矛盾的,因为细胞内的多胺在去极化过程中阻断了这些受体。我们报告说,在海马中间神经元介导反馈抑制的突触LTP是“反Hebbian”:它是由突触前活动,但防止突触后去极化。反赫布LTP可能发生在中间神经元中,这些中间神经元在强烈的锥体细胞放电期间(如尖波)是沉默的,并导致它们在θ活动期间改变激活。
Long-term potentiation (LTP), which approximates Hebb’s postulate of associative learning, typically requires depolarization-dependent glutamate receptors of the NMDA (N-methyl-d-aspartate) subtype. However, in some neurons, LTP depends instead on calcium-permeable AMPA-type receptors. This is paradoxical because intracellular polyamines block such receptors during depolarization. We report that LTP at synapses on hippocampal interneurons mediating feedback inhibition is “anti-Hebbian”: It is induced by presynaptic activity but prevented by postsynaptic depolarization. Anti-Hebbian LTP may occur in interneurons that are silent during periods of intense pyramidal cell firing, such as sharp waves, and lead to their altered activation during theta activity.
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