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首页> 外文期刊>Neuron >Theta Burst Firing Recruits BDNF Release and Signaling in Postsynaptic CA1 Neurons in Spike-Timing-Dependent LTP
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Theta Burst Firing Recruits BDNF Release and Signaling in Postsynaptic CA1 Neurons in Spike-Timing-Dependent LTP

机译:Theta爆发射击招募BDNF释放和突触时间依赖性LTP中突触后CA1神经元的信号。

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摘要

Timing-dependent LTP (t-LTP) is a physiologically relevant type of synaptic plasticity that results from repeated sequential firing of action potentials (APs) in pre- and postsynaptic neurons. t-LTP can be observed in vivo and is proposed to be a cellular correlate of memory formation. While brain-derived neurotrophic factor (BDNF) is essential to high-frequency stimulation-induced LTP in many brain areas, the role of BDNF in t-LTP is largely unknown. Here, we demonstrate a striking change in the expression mechanism of t-LTP in CA1 of the hippocampus following two distinct modes of synaptic activation. Single postsynaptic APs paired with presynaptic stimulation activated a BDNF-independent canonical t-LTP. In contrast, a theta burst of postsynaptic APs preceded by presynaptic stimulation elicited BDNF-dependent postsynaptic t-LTP that relied on postsynaptic BDNF secretion. This suggests that BDNF release during burst-like patterns of activity typically observed in vivo may play a crucial role during memory formation.
机译:时序依赖性LTP(t-LTP)是一种与生理相关的突触可塑性,它是由突触前和突触后神经元重复顺序触发动作电位(AP)产生的。 t-LTP可以在体内观察到,并被认为与记忆形成有关。虽然脑源性神经营养因子(BDNF)对于许多脑区域中高频刺激诱导的LTP是必不可少的,但BDNF在t-LTP中的作用尚不清楚。在这里,我们证明了突触激活的两种不同模式后,海马CA1区t-LTP的表达机制发生了显着变化。单个突触后AP与突触前刺激配对可激活BDNF独立的典型t-LTP。相比之下,突触后AP的theta爆发,再由突触前刺激引起依赖于突触后BDNF分泌的BDNF依赖性突触后t-LTP。这表明在通常在体内观察到的活动的爆发状活动期间,BDNF释放可能在记忆形成过程中起关键作用。

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