尼古丁在新生儿喹吡罗啮齿动物精神病模型中的作用:神经可塑性机制与烟碱受体变化
The effects of nicotine in the neonatal quinpirole rodent model of psychosis: Neural plasticity mechanisms and nicotinic receptor changes.
作者信息
Peterson Daniel J, Gill W Drew, Dose John M, Hoover Donald B, Pauly James R, Cummins Elizabeth D, Burgess Katherine C, Brown Russell W
机构信息
Department of Psychology, East Tennessee State University, Johnson City, TN 37614, United States.
Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, United States.
出版信息
Behav Brain Res. 2017 May 15;325(Pt A):17-24. doi: 10.1016/j.bbr.2017.02.029. Epub 2017 Feb 21.
Neonatal quinpirole (NQ) treatment to rats increases dopamine D2 receptor sensitivity persistent throughout the animal's lifetime. In Experiment 1, we analyzed the role of α7 and α4β2 nicotinic receptors (nAChRs) in nicotine behavioral sensitization and on the brain-derived neurotrophic factor (BDNF) response to nicotine in NQ- and neonatally saline (NS)-treated rats. In Experiment 2, we analyzed changes in α7 and α4β2 nAChR density in the nucleus accumbens (NAcc) and dorsal striatum in NQ and NS animals sensitized to nicotine. Male and female Sprague-Dawley rats were neonatally treated with quinpirole (1mg/kg) or saline from postnatal days (P)1-21. Animals were given ip injections of either saline or nicotine (0.5mg/kg free base) every second day from P33 to P49 and tested on behavioral sensitization. Before each injection, animals were ip administered the α7 nAChR antagonist methyllycaconitine (MLA; 2 or 4mg/kg) or the α4β2 nAChR antagonist dihydro beta erythroidine (DhβE; 1 or 3mg/kg). Results revealed NQ enhanced nicotine sensitization that was blocked by DhβE. MLA blocked the enhanced nicotine sensitization in NQ animals, but did not block nicotine sensitization. NQ enhanced the NAcc BDNF response to nicotine which was blocked by both antagonists. In Experiment 2, NQ enhanced nicotine sensitization and enhanced α4β2, but not α7, nAChR upregulation in the NAcc. These results suggest a relationship between accumbal BDNF and α4β2 nAChRs and their role in the behavioral response to nicotine in the NQ model which has relevance to schizophrenia, a behavioral disorder with high rates of tobacco smoking.
对大鼠进行新生儿期喹吡罗(NQ)治疗会增加多巴胺D2受体敏感性,且这种敏感性在动物的整个生命周期中持续存在。在实验1中,我们分析了α7和α4β2烟碱型受体(nAChRs)在尼古丁行为敏化以及NQ处理和新生儿期生理盐水(NS)处理的大鼠对尼古丁的脑源性神经营养因子(BDNF)反应中的作用。在实验2中,我们分析了对尼古丁敏感的NQ和NS动物伏隔核(NAcc)和背侧纹状体中α7和α4β2 nAChR密度的变化。雄性和雌性Sprague-Dawley大鼠在出生后第(P)1至21天接受喹吡罗(1mg/kg)或生理盐水的新生儿期治疗。从P33至P49,每隔一天给动物腹腔注射生理盐水或尼古丁(0.5mg/kg游离碱),并测试行为敏化情况。在每次注射前,给动物腹腔注射α7 nAChR拮抗剂甲基lycaconitine(MLA;2或4mg/kg)或α4β2 nAChR拮抗剂二氢β刺桐啶(DhβE;1或3mg/kg)。结果显示,NQ增强了尼古丁敏化,而DhβE可阻断这种增强作用。MLA阻断了NQ动物中增强的尼古丁敏化,但未阻断尼古丁敏化。NQ增强了NAcc对尼古丁的BDNF反应,两种拮抗剂均可阻断这种增强作用。在实验2中,NQ增强了尼古丁敏化,并增强了NAcc中α4β2而非α7 nAChR的上调。这些结果表明,伏隔核BDNF与α4β2 nAChRs之间存在关联,以及它们在NQ模型中对尼古丁行为反应的作用,这与精神分裂症(一种吸烟率很高的行为障碍)相关。