Behavioral Effects of Acute Systemic Low-Dose Clozapine in Wild-Type Rats: Implications for the Use of DREADDs in Behavioral Neuroscience.

Behavioral Effects of Acute Systemic Low-Dose Clozapine in Wild-Type Rats: Implications for the Use of DREADDs in Behavioral Neuroscience.
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DOI:
10.3389/fnbeh.2018.00173
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发表时间:
2018
影响因子:
3
通讯作者:
Bähner F
Bähner F
中科院分区:
医学3区
文献类型:
--
作者:
Ilg AK;Enkel T;Bartsch D;Bähner F

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专门由设计药物激活的设计受体(DREADD)是用于操纵特定神经元组活动的流行工具。最近的研究表明,大脑中的 DREADD 效应很可能不是由拟议的配体氯氮平-N-氧化物(CNO)介导的,而是由其代谢物氯氮平(CLOZ)介导的。然而,尚不清楚激活 DREADD 所需的低剂量 CLOZ 是否已经对行为产生与 DREADD 无关的影响,如先前临床前研究中使用的较高 CLOZ 剂量所描述的那样。为了缩小这一差距,我们在雄性野生型大鼠的广泛行为测试中比较了急性全身(腹腔注射)CLOZ 治疗与载体(VEH)的效果。我们发现低至 0.05-0.1 mg/kg 的 CLOZ 剂量显着影响运动、焦虑和认知灵活性,但对工作记忆或社交互动没有影响。这些结果强调了未来化学遗传学实验中仔细控制的必要性,并表明以前缺乏 CNO/CLOZ 控制的研究结果可能需要重新评估。
Designer receptors exclusively activated by designer drugs (DREADDs) are popular tools used to manipulate the activity of defined groups of neurons. Recent work has shown that DREADD effects in the brain are most likely not mediated by the proposed ligand clozapine-N-oxide (CNO) but its metabolite clozapine (CLOZ). However, it is not known whether low doses of CLOZ required to activate DREADDs already have DREADD-independent effects on behavior as described for higher CLOZ doses used in previous preclinical studies. To close this gap, we compared effects of acute systemic (i.p.) CLOZ treatment vs. vehicle (VEH) in a wide range of behavioral tests in male wild-type rats. We found that CLOZ doses as low as 0.05–0.1 mg/kg significantly affected locomotion, anxiety and cognitive flexibility but had no effect on working memory or social interaction. These results highlight the need for careful controls in future chemogenetic experiments and show that previous results in studies lacking CNO/CLOZ controls may require critical re-evaluation.
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