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首页> 外文期刊>The European Journal of Neuroscience >Mice lacking dopamine D1 receptors express normal lithium chloride-induced conditioned taste aversion for salt but not sucrose.
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Mice lacking dopamine D1 receptors express normal lithium chloride-induced conditioned taste aversion for salt but not sucrose.

机译:缺乏多巴胺D1受体的小鼠表达正常的氯化锂诱导的对盐的条件化厌味,但不表达蔗糖。

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Abstract Conditioned taste aversion (CTA), is a form of Pavlovian learning wherein a novel flavour is powerfully associated with subsequent feelings of illness, and is afterwards avoided. In rats, pharmacological blockade of dopamine D1 receptors has been reported to prevent the expression of a CTA to the sweet taste of sucrose or saccharine. We used genetically modified mice to determine whether dopamine D1 receptors are necessary for the expression of a CTA. Food-deprived mice lacking the dopamine D1 receptor (D1r(-/-)) did not express a LiCl-induced (125 or 254 mg/kg) CTA to the sweet taste of 0.5 m sucrose, in agreement with previous pharmacological studies. However, water-deprived D1r(-/-) mice did express normal LiCl-induced (40, 150 and 254 mg/kg) CTA to a salty taste (0.2 m NaCl). Our results suggest that activation of D1 receptors might contribute to the strength of an aversive gustatory association, but might not be required for the formation of a CTA in general.
机译:摘要有条件的厌恶情绪(CTA)是巴甫洛夫式学习的一种形式,其中一种新颖的风味与随后的疾病感有很强的联系,并且在以后被避免。在大鼠中,据报道,多巴胺D1受体的药理学阻断作用可防止CTA表达为蔗糖或糖精的甜味。我们使用转基因小鼠确定多巴胺D1受体对于CTA的表达是否必要。与先前的药理研究一致,缺乏多巴胺D1受体(D1r(-/-))的食物匮乏的小鼠并未表达LiCl诱导的CTA(125或254 mg / kg)对0.5 m蔗糖的甜味。但是,缺水的D1r(-/-)小鼠确实表达了正常的LiCl诱导的(40、150和254 mg / kg)CTA,呈咸味(0.2 m NaCl)。我们的结果表明,D1受体的激活可能有助于增强厌恶性味觉联想的强度,但通常不需要CTA的形成。

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