Age differences in the role of the cannabinoid type 1 receptor on glutamatergic neurons in habituation and spatial memory acquisition.

Age differences in the role of the cannabinoid type 1 receptor on glutamatergic neurons in habituation and spatial memory acquisition.
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大麻素 1 型受体对谷氨酸能神经元在习惯化和空间记忆获取中的作用的年龄差异

DOI:
10.1016/j.lfs.2015.01.034
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发表时间:
2015
期刊:
影响因子:
6.1
通讯作者:
Lutz B
Lutz B
中科院分区:
医学2区
文献类型:
--
作者:
Legler A;Monory K;Lutz B

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目标衰老通常与记忆力下降和神经完整性改变有关。在阿尔茨海默病等病理性衰老中,这些影响会加剧。使用大麻素 CB1 受体缺陷小鼠的研究表明,内源性大麻素系统在记忆处理和神经保护中发挥作用。由于 CB1 受体在不同的神经元群体中表达,在本研究中,我们旨在研究小鼠皮质谷氨酸能神经元 (Glu-CB1-KO) CB1 受体基因失活对空间记忆性能与年龄相关变化的影响。主要方法青少年(5.5-7.5 周)、成人(5.5-7 个月)和老年(11.5-14 个月)在两项空间学习任务中对 Glu-CB1-KO 和 Glu-CB1-WT 小鼠进行了比较,即使用可见平台和隐藏平台的莫里斯水迷宫 (MWM) 以及水十字迷宫 (WCM)。 主要发现在具有可见平台的 MWM 中,成年和老年 Glu-CB1-KO 小鼠表现出任务获取延迟,表明内源性大麻素系统在习惯化中存在年龄依赖性功能。幼年和成年 Glu-CB1-KO 小鼠表现出到 MWM 中隐藏平台的时间和路径长度增加。然而,这些特征都伴随着两个年龄段的趋触性增加,表明焦虑样行为是一个混杂因素。为了排除这种可能的偏差,对这些动物进行了简化的空间学习测定(WCM)测试,结果显示,幼年小鼠的 Glu-CB1-KO 寻找平台的准确性下降,而成年小鼠则没有,因此强烈表明幼年小鼠存在空间记忆障碍。意义我们的结果表明,CB1 受体对皮质谷氨酸能神经元在习惯化和空间学习中的作用具有年龄依赖性。
AimsAging is typically linked with a decline in memory performance and alterations in neural integrity. In pathological aging such as Alzheimer's disease, these effects are aggravated. Studies using cannabinoid CB1 receptor-deficient mice have shown a role of the endocannabinoid system in memory processing and neuroprotection. As the CB1 receptor is expressed in various neuronal populations, in this study, we aimed at investigating the consequences of CB1 receptor gene inactivation in cortical glutamatergic neurons in mice (Glu-CB1-KO) in regard to age-related alterations in spatial memory performance.Main methodsJuvenile (5.5–7.5 weeks), adult (5.5–7 months), and old (11.5–14 months) Glu-CB1-KO and Glu-CB1-WT mice were compared in two spatial learning tasks, the Morris Water Maze (MWM) using both visible and hidden platforms, and the Water Cross Maze (WCM).Key findingsIn the MWM with a visible platform, adult and old Glu-CB1-KO mice showed a delayed acquisition of the task, suggesting an age-dependent function of the endocannabinoid system in habituation. Juvenile and adult Glu-CB1-KO mice exhibited increased time and path length to the hidden platform in the MWM. However, these characteristics were accompanied by increased thigmotaxis in both age groups, suggesting anxiety-like behavior as a confounding factor. To exclude this possible bias, the animals were tested in a simplified spatial learning assay, the WCM, revealing a decreased accuracy of juvenile but not of adult Glu-CB1-KO to find the platform, therefore strongly suggesting spatial memory impairment in juvenile mice.SignificanceOur results suggest an age-dependent role of the CB1 receptor on cortical glutamatergic neurons in both habituation and spatial learning.
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