首页> 外文期刊>Pharmacology, Biochemistry and Behavior >Low-level lead exposure modulates effects of quinpirole and eticlopride on response rates in a fixed-interval schedule.
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Low-level lead exposure modulates effects of quinpirole and eticlopride on response rates in a fixed-interval schedule.

机译:低水平的铅暴露以固定的时间间隔来调节喹吡洛尔和艾替普利特对响应率的影响。

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Exposure to low levels of lead (Pb) results in a wide range of behavioral changes. These behavioral deficits of lead are modified by duration of exposure, level of exposure, and stage of exposure. The mesoaccumbens dopamine (DA) system appears to be critically involved in these alterations; however, the precise mechanisms are not completely understood. This study investigated the effects of systemic administrations of the dopamine D(2)-like receptor agonist, quinpirole, and antagonist, eticlopride, on response rates of postweaning lead-exposed rats in a fixed-interval 1-minute (FI-1) schedule. Postweaning exposure to 50 ppm lead (lead acetate) resulted in increased response rates. The dopamine D(2)-like agonist, quinpirole (0.05, 1.0, 3.0 mg/kg), reversed the effects of lead by reducing the response rates. However the antagonist, eticlopride (0.01 and 0.05), did not produce any marked modulation of the response rates of the lead group. Rather, systemic injections of eticlopride attenuated the response rates of control rats. The effects suggest that lead-induced alterations in FI responding are modulated by dopamine D(2)-like mechanisms. Thus, postweaning, subchronic exposure to lead resulted in enhanced sensitivity to quinpirole administration and reduced sensitivity to eticlopride. These observations are consistent with attenuated dopaminergic activity.
机译:暴露于低水平的铅(Pb)会导致广泛的行为变化。铅的这些行为缺陷会因接触时间,接触水平和接触阶段而改变。中度累积多巴胺(DA)系统似乎与这些改变至关重要。但是,确切的机制尚不完全清楚。这项研究调查了固定间隔1分钟(FI-1)计划中多巴胺D(2)样受体激动剂喹吡罗和拮抗剂依替普利的全身给药对断奶后铅暴露大鼠反应率的影响。 。断奶后暴露于50 ppm铅(乙酸铅)导致响应率提高。多巴胺D(2)样激动剂喹吡罗(0.05,1.0,3.0 mg / kg)通过降低响应率逆转了铅的作用。但是,拮抗剂艾替洛必利(0.01和0.05)并未对铅组的应答率产生任何明显的调节作用。相反,全身注射艾替洛必利可减弱对照组大鼠的反应率。效果表明,铅诱导的FI反应中的改变是由多巴胺D(2)样机制调节的。因此,断奶后,亚慢性暴露于铅导致对喹吡罗尔给药的敏感性增强而对艾替普利特的敏感性降低。这些观察结果与减弱的多巴胺能活性一致。

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