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首页> 外文期刊>The European Journal of Neuroscience >5-HT(2C) receptor activation inhibits appetitive and consummatory components of feeding and increases brain c-fos immunoreactivity in mice.
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5-HT(2C) receptor activation inhibits appetitive and consummatory components of feeding and increases brain c-fos immunoreactivity in mice.

机译:5-HT(2C)受体激活抑制饲料的食性和消费性成分,并增加小鼠的脑c-fos免疫反应性。

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摘要

5-Hydroxytryptamine (5-HT)(2C) and 5-HT(1B) receptors are implicated in the inhibitory modulation of feeding behaviour. However, their respective, and possibly different, roles have not been clearly identified because of a lack of selective 5-HT(2C) receptor agonists. Here, using the putative, selective 5-HT(2C) receptor agonist VER23779, we show that its effects on feeding are fully reversed by pretreatment with a selective 5-HT(2C) receptor antagonist, but unaffected by pretreatment with either a 5-HT(1B) or a 5-HT(2A) receptor antagonist. In mice eating a palatable mash, feeding ends earlier, inactivity is increased but the behavioural satiety sequence is preserved. In a second-order schedule of reinforcement with an initial, non-food-reinforced appetitive phase, VER23779 produces a much greater relative reduction in appetitive responding than the 5-HT(1B) receptor agonist CP-94,253. Increased c-fos immunoreactivity patterns following VER23779 also differ from those described for CP-94,253, in particular showing strong activation of the basolateral amygdala. The different behavioural consequences of 5-HT(2C) and 5-HT(1B) receptor activation may relate to the patterns of c-fos immunoreactivity. In particular, the basolateral amygdala may have a role in maintaining response in the appetitive phase of the second-order schedule and also be susceptible to serotonergic modulation through activation of 5-HT(2C) receptors.
机译:5-羟色胺(5-HT)(2C)和5-HT(1B)受体与进食行为的抑制性调节有关。但是,由于缺乏选择性5-HT(2C)受体激动剂,尚未明确确定它们各自的作用,也可能是不同的作用。在这里,使用推定的选择性5-HT(2C)受体激动剂VER23779,我们显示了其对补料的作用已通过选择性5-HT(2C)受体拮抗剂进行了完全逆转,但不受5- HT(1B)或5-HT(2A)受体拮抗剂。在吃可口的的小鼠中,进食更早结束,不活动增加,但行为饱腹感得以保留。在具有非食品增强的初始食欲阶段的第二阶段强化计划中,VER23779的食欲响应相对降低幅度比5-HT(1B)受体激动剂CP-94,253大得多。 VER23779之后增加的c-fos免疫反应性模式也与针对CP-94,253所述的模式不同,特别是显示了基底外侧杏仁核的强烈激活。 5-HT(2C)和5-HT(1B)受体激活的不同行为后果可能与c-fos免疫反应性的模式有关。特别是,基底外侧杏仁核可能在维持第二阶段食欲阶段的反应中具有作用,并且还容易通过激活5-HT(2C)受体而受到血清素调节作用。

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