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P2Y(1)受体介导器官型脑片共培养中神经元纤维的生长。

P2Y(1) receptor mediated neuronal fibre outgrowth in organotypic brain slice co-cultures.

作者信息

Heine Claudia, Sygnecka Katja, Scherf Nico, Grohmann Marcus, Bräsigk Annett, Franke Heike

机构信息

Translational Centre for Regenerative Medicine (TRM), University of Leipzig, Philipp-Rosenthal-Straße 55, 04103 Leipzig, Germany; Rudolf Boehm Institute of Pharmacology and Toxicology, University of Leipzig, Härtelstr. 16-18, 04107 Leipzig, Germany.

Institute for Medical Informatics and Biometry (IMB), Dresden University of Technology, Fetscherstraße 74, 01307 Dresden, Germany.

出版信息

Neuropharmacology. 2015 Jun;93:252-66. doi: 10.1016/j.neuropharm.2015.02.001. Epub 2015 Feb 13.

Abstract

Extracellular purines have multiple functional roles in development, plastic remodelling, and regeneration of the CNS by stimulating certain P2X/Y receptor (R) subtypes. In the present study we elucidated the involvement of P2YRs in neuronal fibre outgrowth in the developing nervous system. We particularly focused on the P2Y1R subtype and the dopaminergic system, respectively. For this purpose, we used organotypic slice co-cultures consisting of the ventral tegmental area/substantia nigra (VTA/SN) and the prefrontal cortex (PFC). After detecting the presence of the P2Y1R in VTA/SN, PFC, and on outgrowing fibres in the border region (e.g. on glial processes) connecting both brain slices, we could show that pharmacological modulation of the receptor influenced neuronal fibre outgrowth. Biocytin-tracing and tyrosine hydroxylase-immunolabelling together with quantitative image analysis revealed a significant increase in fibre growth in the border region of the co-cultures after treatment with ADPβS (P2Y1,12,13R agonist). The observed stimulatory potential of ADPβS was inhibited by pre-treatment with the P2X/YR antagonist PPADS. In P2Y1R knockout (P2Y1R(-/-)) mice, the ADPβS-induced stimulatory effect was absent, while growth was significantly enhanced in the co-cultures of the respective wild-type. This observation was confirmed in entorhino-hippocampal co-cultures, an example of a different projection system, expressing the P2Y1R. Using wortmannin and PD98059 we further showed that PI3K/Akt and MAPK/ERK cascades are involved in the mechanism underlying ADPβS-induced fibre growth. In conclusion, the data of this study clearly indicate that activation of the P2Y1R stimulates fibre growth and thereby emphasises the general role of this particular receptor subtype during development and regeneration.

摘要

细胞外嘌呤通过刺激某些P2X/Y受体(R)亚型,在中枢神经系统的发育、可塑性重塑和再生中发挥多种功能作用。在本研究中,我们阐明了P2Y受体在发育中的神经系统中神经元纤维生长中的作用。我们分别特别关注P2Y1R亚型和多巴胺能系统。为此,我们使用了由腹侧被盖区/黑质(VTA/SN)和前额叶皮质(PFC)组成的器官型切片共培养物。在检测到VTA/SN、PFC以及连接两个脑切片的边界区域(如胶质细胞突起)中生长纤维上存在P2Y1R后,我们可以表明该受体的药理学调节影响神经元纤维生长。生物素追踪和酪氨酸羟化酶免疫标记以及定量图像分析显示,用ADPβS(P2Y1、12、13R激动剂)处理后,共培养物边界区域的纤维生长显著增加。ADPβS观察到的刺激潜力被P2X/YR拮抗剂PPADS预处理所抑制。在P2Y1R基因敲除(P2Y1R(-/-))小鼠中,不存在ADPβS诱导的刺激作用,而在相应野生型的共培养物中生长显著增强。在表达P2Y1R的不同投射系统示例——内嗅-海马共培养物中证实了这一观察结果。使用渥曼青霉素和PD98059,我们进一步表明PI3K/Akt和MAPK/ERK级联参与了ADPβS诱导的纤维生长的潜在机制。总之,本研究数据清楚地表明,P2Y1R的激活刺激纤维生长,从而强调了这种特定受体亚型在发育和再生过程中的一般作用。

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