Interleukin-1 receptor null mutant mice show decreased anxiety-like behavior and enhanced fear memory.

Interleukin-1 receptor null mutant mice show decreased anxiety-like behavior and enhanced fear memory.
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DOI:
10.1016/j.neulet.2009.03.068
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发表时间:
2009-05-29
影响因子:
2.5
通讯作者:
Duman RS
Duman RS
中科院分区:
医学4区
文献类型:
--
作者:
Koo JW;Duman RS

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IL-1β是一种促炎性细胞因子,有助于心理应激反应,并与各种精神疾病有关,最明显的是抑郁症。临床前研究还表明,IL-1β调节焦虑和恐惧相关的行为,尽管这些发现难以评估,因为IL-1β输注影响运动活动和伤害感受。在这里,我们证明,IL-1 RI空小鼠表现出与焦虑相关行为减少一致的行为表型。这包括与野生型小鼠相比,在高架十字迷宫、明暗和新奇诱导的摄食量减少试验中的显著作用,在运动活动方面没有差异。在恐惧条件反射方面,IL-1 RI基因敲除小鼠在听觉和情境恐惧条件反射测试中表现出更多的冻结,并且对疼痛敏感性没有影响。综上所述,结果表明IL-1β/IL-1 RI信号通路诱导焦虑相关行为并损害恐惧记忆。
IL-1β is a proinflammatory cytokine that contributes to psychological stress responses and has been implicated in various psychiatric disorders most notably depression. Preclinical studies also demonstrate that IL-1β modulates anxiety- and fear-related behaviors, although these findings are difficult to assess because IL-1β infusions influence locomotor activity and nociception. Here we demonstrate that IL-1RI null mice exhibit a behavioral phenotype consistent with a decrease in anxiety-related behaviors. This includes significant effects in the elevated plus maze, light–dark, and novelty-induced hypophagia tests compared to wild-type mice, with no differences in locomotor activity. With regard to fear conditioning, IL-1RI null mice showed more freezing in auditory and contextual fear conditioning tests, and there was no effect on pain sensitivity. Taken together, the results indicate that the IL-1β/IL-1RI signaling pathway induces anxiety-related behaviors and impairs fear memory.
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