Role of Nicotinamide N-Methyltransferase in Dorsal Striatum in Cocaine Place Preference

Role of Nicotinamide N-Methyltransferase in Dorsal Striatum in Cocaine Place Preference
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背侧纹状体烟酰胺 N-甲基转移酶在可卡因位置偏好中的作用

DOI:
10.1038/npp.2017.147
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发表时间:
2017-07
影响因子:
7.6
通讯作者:
Cen Xiaobo
Cen Xiaobo
中科院分区:
医学1区
文献类型:
--
作者:
Luo Li;Shang Fei Fei;Long Hailei;Jiang Linhong;Zhu Ruiming;Zhao Qian;Gu Hui;Kong Jueying;Xu Wei;Zhao Yinglan;Cen Xiaobo

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烟酰胺 N-甲基转移酶 (NNMT) 将甲基从 S-腺苷-L-甲硫氨酸 (SAM) 转移到烟酰胺 (NA),产生 S-腺苷-L-高半胱氨酸 (SAH) 和 1-甲基烟酰胺 (MeN)。 NNMT 与多种疾病有关;然而,NNMT 在吸毒成瘾中的作用很大程度上尚不清楚。在这里,我们发现可卡因条件下小鼠的背侧纹状体(DS)中 Nnmt 的表达显着上调。可卡因显着降低 DS 中的 SAM/SAH 比值水平,同时伴随着 Rac1 和 RhoA 活性的降低。慢病毒介导的背内侧纹状体 (DMS) 中 Nnmt 的敲除减弱了可卡因条件位置偏好 (CPP) 奖励,但增加了纹状体 SAM/SAH 比率水平以及 Rac1 和 RhoA 活性。此外,通过 DMS 内输注 MeN 对 NNMT 进行药理学抑制,可减弱可卡因 CPP 以及 Rac1 和 RhoA 的活性,但会增加 SAM/SAH 比率。这些结果表明,NNMT 依赖性转甲基作用参与了 Rac1 和 RhoA 的激活,它们利用 SAM 作为甲基供体辅助因子。使用 RhoGDIα 抗体进行免疫共沉淀测定,间接捕获与 RhoGDIα 结合的 Rac1 或 RhoA。结果表明,可卡因增加了 RhoGDIα 与 Rac1 或 RhoA 的关联,而这种作用被 Nnmt 敲低所抑制。总的来说,我们的研究结果表明,NNMT 通过 SAM 介导的 Rac1 和 RhoA 修饰来调节可卡因 CPP。
Nicotinamide N-methyltransferase (NNMT) transfers the methyl from S-adenosyl-L-methionine (SAM) to nicotinamide (NA) to produce S-adenosyl-L-homocysteine (SAH) and 1-methylnicotinamide (MeN). NNMT has been implicated in a variety of diseases; however, the role of NNMT in drug addiction is largely unknown. Here, we found that the expression of Nnmt was significantly upregulated in the dorsal striatum (DS) of cocaine-conditioned mice. Cocaine significantly decreased SAM/SAH ratio levels in the DS, which was accompanied with the decreased activities of Rac1 and RhoA. Lentivirus-mediated knockdown of Nnmt in the dorsomedial striatum (DMS) attenuated cocaine conditioned place preference (CPP) reward, but increased striatal SAM/SAH ratio levels as well as Rac1 and RhoA activities. In addition, pharmacological inhibition of NNMT through intra-DMS infusion of MeN attenuated cocaine CPP and the activities of Rac1 and RhoA, but increased SAM/SAH ratio. These results suggest that NNMT-dependent transmethylation is involved in the activation of Rac1 and RhoA, which utilize SAM as a methyl donor cofactor. Co-immunoprecipitation assay using a RhoGDIα antibody indirectly captured Rac1 or RhoA that were bound to RhoGDIα. The results showed that cocaine increased the association of RhoGDIα with Rac1 or RhoA, whereas such effect was inhibited by Nnmt knockdown. Collectively, our findings show that NNMT regulates cocaine CPP through SAM-mediated modification of Rac1 and RhoA.
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发表时间: 2015-08
期刊: Nature medicine
影响因子: 82.9
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发表时间: 2015-11-23
期刊: Scientific reports
影响因子: 4.6
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发表时间: 2012-10
期刊: Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology
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