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首页> 外文期刊>The European Journal of Neuroscience >Endocannabinoids modulate stress-induced suppression of hippocampal cell proliferation and activation of defensive behaviours.
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Endocannabinoids modulate stress-induced suppression of hippocampal cell proliferation and activation of defensive behaviours.

机译:内源性大麻素调节应激诱导的海马细胞增殖抑制和防御行为的激活。

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摘要

The endocannabinoid system has been shown to regulate both the hypothalamic-pituitary-adrenal (HPA) axis and emotionality. The present experiment was designed to examine whether pharmacological modulation of the endocannabinoid system would affect the suppression of hippocampal cell proliferation and increase in defensive behaviours seen following exposure to predator odour (trimethylthiazoline; TMT) stress. Rats were administered either an endocannabinoid uptake inhibitor (AM404; 2 mg/kg) or a cannabinoid CB1 receptor antagonist (AM251; 5 mg/kg) 30 min prior to exposure to TMT. Exposure to TMT reduced cell proliferation in the dentate gyrus and increased the expression of defensive burying. Administration of AM404 significantly inhibited defensive burying, and attenuated the reduction in cell proliferation in response to TMT exposure. Administration of AM251 alone significantly increased cell proliferation; however, pretreatment with AM251 prevented neither the stress-induced suppression of cell proliferation nor the stress-induced increase in behavioural responses. These results support previous research demonstrating that augmentation of endocannabinoid signalling can suppress stress-responsive systems. They also suggest that endocannabinoids may play a complex role in the regulation of neurogenesis via cell proliferation in the hippocampus.
机译:内源性大麻素系统已被证明可以调节下丘脑-垂体-肾上腺(HPA)轴和情绪。本实验旨在检查内源性大麻素系统的药理学调节是否会影响海马细胞增殖的抑制作用,并在暴露于捕食者气味(三甲基噻唑啉; TMT)胁迫后所见的防御行为增加。在暴露于TMT之前30分钟,给大鼠服用内源性大麻吸收抑制剂(AM404; 2 mg / kg)或大麻素CB1受体拮抗剂(AM251; 5 mg / kg)。暴露于TMT会减少齿状回中的细胞增殖并增加防御性掩埋的表达。 AM404的给药显着抑制了防御性掩埋,并减弱了响应TMT暴露的细胞增殖的减少。单独施用AM251可以显着增加细胞增殖。但是,用AM251进行预处理既不能预防应激诱导的细胞增殖抑制,也不能预防应激诱导的行为反应增加。这些结果支持了以前的研究,表明内源性大麻素信号传导的增强可以抑制应激反应系统。他们还表明,内源性大麻素可能通过海马细胞的增殖在神经发生的调节中起着复杂的作用。

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