Yildirim Emre, Connor David A, Gould Thomas J
Department of Psychology, Program in Neuroscience, Temple University, Philadelphia, Pennsylvania, USA.
Behav Pharmacol. 2015 Apr;26(3):241-8. doi: 10.1097/FBP.0000000000000111.
Nicotine withdrawal produces cognitive deficits that can predict relapse. Amelioration of these cognitive deficits emerges as a target in current smoking cessation therapies. In rodents, withdrawal from chronic nicotine disrupts contextual fear conditioning (CFC), whereas acute nicotine enhances this hippocampus-specific learning and memory. These modifications are mediated by β2-subunit-containing (β2*) nicotinic acetylcholine receptors in the hippocampus. We aimed to test ABT-089, a partial agonist of α4β2*, and ABT-107, an α7 nicotinic acetylcholine receptor agonist, for amelioration of cognitive deficits induced by withdrawal from chronic nicotine in mice. Mice underwent chronic nicotine administration (12.6 mg/kg/day or saline for 12 days), followed by 24 h of withdrawal. At the end of withdrawal, mice received 0.3 or 0.6 mg/kg ABT-089 or 0.3 mg/kg ABT-107 (doses were determined through initial dose-response experiments and prior studies) and were trained and tested for CFC. Nicotine withdrawal produced deficits in CFC that were reversed by acute ABT-089, but not ABT-107. Cued conditioning was not affected. Taken together, our results suggest that modulation of hippocampal learning and memory using ABT-089 may be an effective component of novel therapeutic strategies for nicotine addiction.
尼古丁戒断会产生可预测复吸的认知缺陷。改善这些认知缺陷已成为当前戒烟疗法的一个目标。在啮齿动物中,慢性尼古丁戒断会破坏情境恐惧条件反射(CFC),而急性尼古丁则会增强这种海马体特异性的学习和记忆。这些改变是由海马体中含β2亚基(β2*)的烟碱型乙酰胆碱受体介导的。我们旨在测试α4β2*的部分激动剂ABT - 089和α7烟碱型乙酰胆碱受体激动剂ABT - 107对小鼠慢性尼古丁戒断所致认知缺陷的改善作用。小鼠接受慢性尼古丁给药(12.6毫克/千克/天或生理盐水,持续12天),随后戒断24小时。在戒断结束时,小鼠接受0.3或0.6毫克/千克的ABT - 089或0.3毫克/千克的ABT - 107(剂量通过初始剂量反应实验和先前研究确定),并进行CFC训练和测试。尼古丁戒断导致CFC缺陷,急性给予ABT - 089可逆转该缺陷,但ABT - 107无效。线索性条件反射未受影响。综上所述,我们的结果表明使用ABT - 089调节海马体学习和记忆可能是尼古丁成瘾新治疗策略的有效组成部分。