Object-in-place associative recognition memory depends on glutamate receptor neurotransmission within two defined hippocampal-cortical circuits: a critical role for AMPA and NMDA receptors in the hippocampus, perirhinal, and prefrontal cortices.

Object-in-place associative recognition memory depends on glutamate receptor neurotransmission within two defined hippocampal-cortical circuits: a critical role for AMPA and NMDA receptors in the hippocampus, perirhinal, and prefrontal cortices.
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DOI:
10.1093/cercor/bht245
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发表时间:
2015-02
期刊:
Cerebral cortex (New York, N.Y. : 1991)
影响因子:
--
通讯作者:
Warburton EC
Warburton EC
中科院分区:
其他
文献类型:
--
作者:
Barker GR;Warburton EC

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原地物体联想识别记忆依赖于海马(HPC)、鼻周(PRH)和内侧前额叶(mPFC)皮质之间的相互作用,但谷氨酸受体神经传递对这些相互作用的贡献尚不清楚。 HPC 中的 NMDA 受体 (NMDAR) 对于对象就地记忆的编码至关重要,但对于单项对象识别则不然。接下来,使用断开程序来检查 HPC-mPFC 和 HPC-PRH 中“并发”谷氨酸神经传递的重要性。在采集或测试之前,将 NBQX(AMPAR 拮抗剂)单侧输注到 HPC-mPFC 或 HPC-PRH 中,会损害原位物体性能。因此,这两个电路对于编码和检索都是必需的。交叉单侧 AP5(NMDAR 拮抗剂)输注到 HPC-mPFC 或 HPC-PRH 中,编码受损,但恢复不受影响。具体而言,交叉 HPC-mPFC 输注会损害短期(5 分钟)和长期(1 小时)记忆,而 HPC-PRH 输注仅损害长期记忆。 AP5 在 HPC-PRH 中对就地物体记忆的这种延迟依赖性影响与其在 PRH 中对单项物体识别记忆的影响一致,从而表明单一 PRH 突触可塑性机制支持不同的识别记忆过程。此外,阻断网络内任何一对结构中的兴奋性神经传递都会损害“两者”的编码和检索,因此对象就地记忆显然需要跨多个结构的网络相互依赖。
Object-in-place associative recognition memory depends on an interaction between the hippocampus (HPC), perirhinal (PRH), and medial prefrontal (mPFC) cortices, yet the contribution of glutamate receptor neurotransmission to these interactions is unknown. NMDA receptors (NMDAR) in the HPC were critical for encoding of object-in-place memory but not for single-item object recognition. Next, a disconnection procedure was used to examine the importance of “concurrent” glutamate neurotransmission in the HPC-mPFC and HPC-PRH. Contralateral unilateral infusions of NBQX (AMPAR antagonist), into the HPC-mPFC, or HPC-PRH, either before acquisition or test, impaired object-in-place performance. Thus, both circuits are necessary for encoding and retrieval. Crossed unilateral AP5 (NMDAR antagonist) infusions into the HPC-mPFC or HPC-PRH impaired encoding, but not retrieval. Specifically crossed HPC-mPFC infusions impaired both short-term (5 min) and longer term (1 h) memory while HPC-PRH infusions impaired longer term memory only. This delay-dependent effect of AP5 in the HPC-PRH on object-in-place memory, accords with its effects in the PRH, on single item object recognition memory, thereby suggesting that a single PRH synaptic plasticity mechanism underpins different recognition memory processes. Further, blocking excitatory neurotransmission in any pair of structures within the networks impaired “both” encoding and retrieval, thus object-in-place memory clearly requires network interdependency across multiple structures.
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