Dysregulation of dopaminergic regulatory mechanisms in the mesolimbic pathway induced by morphine and morphine withdrawal

被引:20
作者
Garcia-Perez, Daniel [1 ,2 ]
Lopez-Bellido, Roger [3 ]
Rodriguez, Raquel E. [3 ]
Laorden, M. Luisa [1 ,2 ]
Nunez, Cristina [1 ,2 ]
Milanes, M. Victoria [1 ,2 ]
机构
[1] Univ Murcia, Grp Mol & Cellular Pharmacol, Med Fac Murcia, E-30100 Murcia, Spain
[2] IMIB, Murcia, Spain
[3] Univ Salamanca, Inst Neurociencias Castilla & Leon, E-37008 Salamanca, Spain
关键词
Morphine dependence and withdrawal; Ventral tegmental area; Nucleus accumbens; Nurr1; Pitx3; Dopamine; Tyrosine hydroxylase; VENTRAL TEGMENTAL AREA; MU-OPIOID-RECEPTOR; MESSENGER-RNA EXPRESSION; NUCLEUS-ACCUMBENS; NEURONS; MIDBRAIN; REWARD; ADDICTION; GENE; NURR1;
D O I
10.1007/s00429-014-0761-5
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 ;
摘要
Dopamine (DA) is thought to represent a teaching signal and has been implicated in the induction of addictive behaviours. Previously, it has been proposed that the transcription factors Nurr1 and Pitx3, which are critical for transcription of a set of genes involved in DA metabolism in the mesolimbic pathway, are associated with addiction pathology. The aim of our study was to investigate abnormalities in the mesolimbic pathway associated with morphine dependence and withdrawal. Using quantitative real-time PCR, immunofluorescence, HPLC and Western blotting, here we studied the effects of single morphine administration, morphine dependence and morphine withdrawal on Nurr1 and Pitx3 expression as well as on the DA marker tyrosine hydroxylase (TH) and the turnover of DA in the ventral tegmental area (VTA) and/or nucleus accumbens. We showed that the three experimental conditions caused induction of Nurr1 and Pitx3 in the VTA, which correlated with changes in TH expression during chronic morphine administration. Present data also confirmed the colocalization of Nurr1 and Pitx3 with TH-positive neurons in the posterior VTA. Furthermore, during morphine dependence, Nurr1 was detected in the nucleus compartment of VTA TH-positive neurons, whereas Pitx3 was strongly detected in the nucleus of TH-positive neurons after single morphine administration and during morphine withdrawal. The number of TH neurons, number of Nurr1 or Pitx3-positive cells, and the number of TH neurons expressing Nurr1 or Pitx3 were not modified in the subpopulations of DA neurons. Present data provide novel insight into the potential correlation between Nurr1 and Pitx3 and DA neurons plasticity during opiate addiction in the mesolimbic pathway.
引用
收藏
页码:1901 / 1919
页数:19
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