Upregulation of the cannabinoid CB2 receptor in environmental and viral inflammation-driven rat models of Parkinson's disease

被引:44
作者
Concannon, Ruth M. [1 ,2 ]
Okine, Bright N. [1 ,2 ]
Finn, David P. [1 ,2 ]
Dowd, Eilis [1 ,2 ]
机构
[1] Natl Univ Ireland, Pharmacol & Therapeut, Galway, Ireland
[2] Natl Univ Ireland, Galway Neurosci Ctr, Galway, Ireland
关键词
Parkinson's disease; Neuroinflammation; Microglia; Endocannabinoid system; CB2; receptors; H5N1; INFLUENZA-VIRUS; ACID AMIDE HYDROLASE; BASAL GANGLIA; SPINAL-CORD; ENDOCANNABINOID SYSTEM; CEREBROSPINAL-FLUID; EXPRESSION; TARGET; NEUROINFLAMMATION; DEGENERATION;
D O I
10.1016/j.expneurol.2016.06.014
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
In recent years, it has become evident that Parkinson's disease is associated with a self-sustaining cycle of neuroinflammation and neurodegeneration, with dying neurons activating microglia, which, once activated, can release several factors that kill further neurons. One emerging pharmacological target that has the potential to break this cycle is the microglial CB2 receptor which, when activated, can suppress microglial activity and reduce their neurotoxicity. However, very little is known about CB2 receptor expression in animal models of Parkinson's disease which is essential for valid preclinical assessment of the anti-Parkinsonian efficacy of drugs targeting the CB2 receptor. Therefore, the aim of this study was to investigate and compare the changes that occur in CB2 receptor expression in environmental and inflammation-driven models of Parkinson's disease. To do so, male Sprague Dawley rats were given unilateral, intra-striatal injections of the Parkinson's disease-associated agricultural pesticide, rotenone, or the viral-like inflammagen, polyinosinic:polycytidylic acid (Poly (I:C)). Animals underwent behavioural testing for motor dysfunction on days 7, 14 and 28 post-surgery, and were sacrificed on days 1, 4,14 and 28. Changes in the endocannabinoid system and neuroinflamamtion were investigated by qRT-PCR, liquid chromatography-mass spectrometry and immunohistochemistry. After injection of rotenone or Poly (I:C) into the rat striatum, we found that expression of the CB2 receptor was significantly elevated in both models, and that this increase correlated significantly with an increase in microglial activation in the rotenone model. Interestingly, the increase in CB2 receptor expression in the inflammation-driven Poly (I:C) model was significantly more pronounced than that in the neurotoxic rotenone model. Thus, this study has shown that CB2 receptor expression is dysregulated in animal models of Parkinson's disease, and has also revealed significant differences in the level of dysregulation between the models themselves. This study indicates that these models may be useful for further investigation of the CB2 receptor as a target for anti-inflammatory disease modification in Parkinson's disease. (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码:204 / 212
页数:9
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