Harpagoside attenuates MPTP/MPP⁺ induced dopaminergic neurodegeneration and movement disorder via elevating glial cell line-derived neurotrophic factor
| Autor: | Xiaoyu, Sun, Zhongkui, Xiong, Yongfang, Zhang, Ya, Meng, Gang, Xu, Zhiming, Xia, Jiamei, Li, Rui, Zhang, Zunji, Ke, Zongqin, Xia, Yaer, Hu |
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| Rok vydání: | 2011 |
| Předmět: |
Male
Tyrosine 3-Monooxygenase Enzyme-Linked Immunosorbent Assay Motor Activity Antibodies Rats Sprague-Dawley Mice Mesencephalon Pregnancy Animals Glial Cell Line-Derived Neurotrophic Factor Glycosides RNA Messenger Cells Cultured Pyrans Dopamine Plasma Membrane Transport Proteins Dopaminergic Neurons MPTP Poisoning Axons Corpus Striatum Rats Mice Inbred C57BL Disease Models Animal Neuroprotective Agents Gene Expression Regulation 1-Methyl-4-phenyl-1 2 3 6-tetrahydropyridine Rotarod Performance Test Nerve Degeneration Female |
| Zdroj: | Journal of neurochemistry. 120(6) |
| ISSN: | 1471-4159 |
| Popis: | Parkinson's disease is a chronic neurodegenerative movement disorder characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta. New therapeutic approaches aiming at delaying or reversing the neurodegenerative process are under active investigations. In this work, we found that harpagoside, an iridoid purified from the Chinese medicinal herb Scrophularia ningpoensis, could not only prevent but also rescue the dopaminergic neurodegeneration in MPTP/MPP(+) intoxication with promising efficacy. Firstly, in cultured mesencephalic neurons, harpagoside significantly attenuated the loss of TH-positive neuron numbers and the shortening of axonal length. Secondly, in a chronic MPTP mouse model, harpagoside dose-dependently improved the loco-motor ability (rotarod test), increased the TH-positive neuron numbers in the substantia nigra pars compacta (unbiased stereological counting) and increased the striatal DAT density ((125) I-FP-CIT autoradiography). Thirdly, harpagoside markedly elevated the GDNF mRNA and GDNF protein levels in MPTP/MPP(+) lesioned models. However, the protecting effect of harpagoside on the dopaminergic degeneration disappeared when the intrinsic GDNF action was blocked by either the Ret inhibitor PP1 or the neutralizing anti-GDNF antibody. Taken together, we conclude that harpagoside attenuates the dopaminergic neurodegeneration and movement disorder mainly through elevating glial cell line-derived neurotrophic factor. |
| Databáze: | OpenAIRE |
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