首页> 外文期刊>Pharmacology, Biochemistry and Behavior >Individual differences in pavlovian autoshaping of lever pressing in rats predict stress-induced corticosterone release and mesolimbic levels of monoamines.
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Individual differences in pavlovian autoshaping of lever pressing in rats predict stress-induced corticosterone release and mesolimbic levels of monoamines.

机译:帕夫洛夫模型中大鼠按动杆的自动成型的个体差异预测应激诱导的皮质酮释放和单胺的中脑边缘水平。

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摘要

Pavlovian autoshaping CRs are directed and reflexive consummatory responses targeted at objects repeatedly paired with rewarding substances. To evaluate the hypothesis that autoshaping may provide an animal learning model of vulnerability to drug abuse, this study relates individual differences in lever-press autoshaping CR performance in rats to stress-induced corticosterone release and tissue monoamine levels in the mesolimbic dopamine tract. Long-Evans rats (n = 14) were given 20 sessions of Pavlovian autoshaping training wherein the insertion of a retractable lever CS was followed by the response-independent presentation of food US. Large between-subjects differences in lever-press autoshaping CR performance were observed, with group high CR frequency (n = 5) performing many more lever press CRs than group low CR frequency (n = 9). Tail-blood samples were obtained before and after the 20th autoshaping session, then 24 h later the rats were sacrificed and dissection yielded tissue samples of nucleus accumbens (NAC), prefrontal cortex (PFC), caudate putamen (CP), and ventral tegmental area (VTA). Serum levels of postsession corticosterone were elevated in group high CR frequency. HPLC revealed that group high CR frequency had higher tissue levels of dopamine and DOPAC in NAC, lower levels of DOPAC/DA turnover in CP, and lower levels of 5-HIAA and lower 5-HIAA/5-HT turnover in VTA. The neurochemical profile of rats that perform more autoshaping CRs share some features of vulnerability to drug abuse.
机译:巴甫洛夫自动整形CR是针对和反复与奖励性物质配对的对象进行的反省性消费反应。为了评估自动成形可能提供药物滥用易感性的动物学习模型的假设,本研究将大鼠按压力自动成形CR性能的个体差异与应激诱导的皮质酮释放和中脑边缘多巴胺束中的组织单胺水平相关联。对Long-Evans大鼠(n = 14)进行了20次Pavlovian自动塑形训练,其中在插入可伸缩杠杆CS之后,进行了与反应无关的食品US呈现。观察到杆间按压自整形CR性能在受试者之间存在较大差异,高组CR频率(n = 5)执行的杆按压CR比组低CR频率(n = 9)多得多。在第20次自动整形之前和之后获取尾血样品,然后在24 h后处死大鼠并解剖产生伏隔核(NAC),前额叶皮层(PFC),尾状壳核(CP)和腹侧被盖区域的组织样品。 (VTA)。高CR频率组中,治疗后皮质酮的血清水平升高。 HPLC显示,高CR频率组在NAC中具有较高的多巴胺和DOPAC组织水平,在CP中具有较低的DOPAC / DA转换水平,而在VTA中具有较低的5-HIAA水平和较低的5-HIAA / 5-HT转换。执行更多自动整形CR的大鼠的神经化学特征具有易受药物滥用的某些特征。

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