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Natural alkaloid harmine promotes degradation of alpha-synuclein via PKA-mediated ubiquitin-proteasome system activation
Cai,Cui Zan1; Zhou,He Feng1; Yuan,Ning Ning1; Wu,Ming Yue1; Lee,Simon Ming Yuen1; Ren,Jiao Yan2; Su,Huan Xing1; Lu,Jin Jian1; Chen,Xiu Ping1; Li,Min3; Tan,Jie Qiong4; Lu,Jia Hong1
Source PublicationPhytomedicine
AbstractBackground: Parkinson's disease (PD)is an age-dependent progressive movement disorder characterized by a profound and selective loss of nigrostriatal dopaminergic neurons. Accumulation of -synuclein (-syn)positive protein aggregates in the substantia nigra is a pathological hallmark of PD, indicating that protein turnover defect is implicated in PD pathogenesis. Purpose: This study aims to identify neuroprotective compounds which can alleviate the accumulation of -syn in neuronal cells and dissect the underlying mechanisms. Methods: High throughput screening was performed by dot blot assay. The degradation of different forms of -syn by candidate compounds were assessed by western blot. The autophagy lysosome pathway and ubiquitin-proteasome system were examined to dissect the degradation pathway. The UPS activity was assessed by cellular UPS substrates degradation assay and biochemical proteasome activity assay. Q-PCR was performed to test the mRNA level of different proteasome subunits. Furthermore, Neuroprotective effect of candidate compound was tested by LDH assay and PI staining. Results: Through the high throughput screening, harmine was identified as a potent -syn lowering compound. The time-dependent and dose-dependent effects of harmine on the degradation of different forms of -syn were further confirmed. Harmine could dramatically promote the degradation of UPS substrates GFP-CL1, Ub-R-GFP and Ub-G76V-GFP, and activate cellular proteasome activity. Mechanistically, harmine dramatically enhanced PKA phosphorylation to enhance proteasome subunit PSMD1 expression. PKA inhibitor blocked the effects of harmine in activating UPS, up regulating PSMD1 and promoting -syn degradation, indicating that harmine enhances UPS function via PKA activation. Moreover, harmine efficiently rescued cell death induced by over-expression of -syn, via UPS-dependent manner. Conclusion: Harmine, as a new proteasome enhancer, may have potential to be developed into therapeutic agent against neurodegenerative diseases associated with UPS dysfunction and aberrant proteins accumulation.
Keyword-synuclein Harmine Parkinson's disease Protein kinase A Ubiquitin-proteasome system
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Cited Times [WOS]:9   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionInstitute of Chinese Medical Sciences
Affiliation1.State Key Laboratory of Quality Research in Chinese Medicine,Institute of Chinese Medical Sciences,University of Macau,Macao SAR,China
2.School of Food Science and Engineering,South China University of Technology,Guangzhou,Wushan RD., Tianhe District,China
3.Mr. and Mrs. Ko Chi Ming Centre for Parkinson's Disease Research,School of Chinese Medicine,Hong Kong Baptist University,Hong Kong
4.Center for Medical Genetics,School of Life Sciences,Central South University,Changsha,China
First Author AffilicationInstitute of Chinese Medical Sciences
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GB/T 7714
Cai,Cui Zan,Zhou,He Feng,Yuan,Ning Ning,et al. Natural alkaloid harmine promotes degradation of alpha-synuclein via PKA-mediated ubiquitin-proteasome system activation[J]. Phytomedicine,2019,61.
APA Cai,Cui Zan.,Zhou,He Feng.,Yuan,Ning Ning.,Wu,Ming Yue.,Lee,Simon Ming Yuen.,...&Lu,Jia Hong.(2019).Natural alkaloid harmine promotes degradation of alpha-synuclein via PKA-mediated ubiquitin-proteasome system activation.Phytomedicine,61.
MLA Cai,Cui Zan,et al."Natural alkaloid harmine promotes degradation of alpha-synuclein via PKA-mediated ubiquitin-proteasome system activation".Phytomedicine 61(2019).
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