Restoring Spinal Noradrenergic Inhibitory Tone Attenuates Pain Hypersensitivity in a Rat Model of Parkinson's Disease

In the present study, we investigated whether restoring descending noradrenergic inhibitory tone can attenuate pain in a PD rat model, which was established by stereotaxic infusion of 6-hydroxydopamine (6-OHDA) into the bilateral striatum (CPu). PD rats developed thermal and mechanical hypersensitiv...

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Veröffentlicht in:Neural plasticity. - 1998. - 2016(2016) vom: 01., Seite 6383240
1. Verfasser: Cao, Lei-Fang (VerfasserIn)
Weitere Verfasser: Peng, Xiao-Yan, Huang, Ya, Wang, Bing, Zhou, Feng-Ming, Cheng, Ruo-Xiao, Chen, Li-Hua, Luo, Wei-Feng, Liu, Tong
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2016
Zugriff auf das übergeordnete Werk:Neural plasticity
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Benzylamines Levodopa 46627O600J Oxidopamine 8HW4YBZ748 DSP 4 PQ1P7JP5C1 Norepinephrine X4W3ENH1CV
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520 |a In the present study, we investigated whether restoring descending noradrenergic inhibitory tone can attenuate pain in a PD rat model, which was established by stereotaxic infusion of 6-hydroxydopamine (6-OHDA) into the bilateral striatum (CPu). PD rats developed thermal and mechanical hypersensitivity at the 4th week after surgery. HPLC analysis showed that NE content, but not dopamine or 5-HT, significantly decreased in lumbar spinal cord in PD rats. Additional noradrenergic depletion by injection of N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine (DSP-4) aggravated pain hypersensitivity in PD rats. At the 5th week after injection of 6-OHDA, systemic treatment with pharmacological norepinephrine (NE) precursor droxidopa (L-DOPS) or α2 adrenoceptor agonist clonidine significantly attenuated thermal and mechanical pain hypersensitivity in PD rats. Furthermore, application of norepinephrine (NE) and 5-hydroxytryptamine (5-HT) reuptake inhibitors duloxetine, but not 5-HT selective reuptake inhibitors sertraline, significantly inhibited thermal and mechanical pain hypersensitivity in PD rats. Systemic administration of Madopar (L-DOPA) or the D2/D3 agonist pramipexole slightly inhibited the thermal, but not mechanical, hypersensitivity in PD rats. Thus, our study revealed that impairment of descending noradrenergic system may play a key role in PD-associated pain and restoring spinal noradrenergic inhibitory tone may serve as a novel strategy to manage PD-associated pain 
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700 1 |a Peng, Xiao-Yan  |e verfasserin  |4 aut 
700 1 |a Huang, Ya  |e verfasserin  |4 aut 
700 1 |a Wang, Bing  |e verfasserin  |4 aut 
700 1 |a Zhou, Feng-Ming  |e verfasserin  |4 aut 
700 1 |a Cheng, Ruo-Xiao  |e verfasserin  |4 aut 
700 1 |a Chen, Li-Hua  |e verfasserin  |4 aut 
700 1 |a Luo, Wei-Feng  |e verfasserin  |4 aut 
700 1 |a Liu, Tong  |e verfasserin  |4 aut 
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