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首页> 外文期刊>The European Journal of Neuroscience >Selective antagonism of medial prefrontal cortex D4 receptors decreases fear-related behaviour in rats.
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Selective antagonism of medial prefrontal cortex D4 receptors decreases fear-related behaviour in rats.

机译:内侧前额叶皮层D4受体的选择性拮抗作用可降低大鼠的恐惧相关行为。

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摘要

It is well known that the mesolimbocortical dopamine pathway is highly active during periods of stress and fear. However, very little research has directly examined how dopamine receptors in this pathway influence fear-related behaviour. The present study examined the effects of selective antagonism of D(4), D(1) and D(2) dopamine receptors of the medial prefrontal cortex (MPFC) on rats' fear behaviour in the elevated plus-maze and the shock-probe burying tests. The results demonstrated that bilateral intra-MPFC infusions of the highly selective D(4) antagonist, L-745 870 (0.2, 1 or 10 nmol/0.5 microL), increased the percentage of open-arm entries and open-arm time in the elevated plus-maze test (1 nmol/0.5 microL), and decreased the duration of burying in the shock-probe test (0.2 or 1 nmol/0.5 microL). Furthermore, none of the doses of the D(4) antagonist affected measures of general activity or pain sensitivity. Intra-MPFC infusions of the D(1) antagonist, SCH-23390 (0.2 or 1 nmol/0.5 microL), or the D(2) antagonist, remoxipride (0.2, 1 or 10 nmol/0.5 microL), had no significant behavioural effects in either test. Taken together, these findings suggest that MPFC D(4) receptors may play an important role in the mediation of fear-related behaviour.
机译:众所周知,在压力和恐惧期间,中腰皮层多巴胺途径非常活跃。但是,很少有研究直接检查该途径中的多巴胺受体如何影响与恐惧有关的行为。本研究研究了内侧前额叶皮层(MPFC)的D(4),D(1)和D(2)多巴胺受体的选择性拮抗对高迷宫和电击探针中大鼠恐惧行为的影响掩埋测试。结果表明,高选择性D(4)拮抗剂L-745 870(0.2、1或10 nmol / 0.5 microL)的双侧MPFC内输注增加了开臂进入的百分比和开臂时间增强的迷宫测试(1 nmol / 0.5 microL),并减少了电击测试掩埋的持续时间(0.2或1 nmol / 0.5 microL)。此外,D(4)拮抗剂的剂量均未影响一般活动或疼痛敏感性的量度。 D(1)拮抗剂SCH-23390(0.2或1 nmol / 0.5 microL)或D(2)拮抗剂remoxipride(0.2、1或10 nmol / 0.5 microL)的MPFC内输注没有明显的行为两种测试中的效果。综上所述,这些发现表明MPFC D(4)受体可能在与恐惧有关的行为的调节中起重要作用。

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