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Embelin averts MPTP-induced dysfunction in mitochondrial bioenergetics and biogenesis via activation of SIRT1.
Biochimica et Biophysica Acta (BBA) - Bioenergetics ( IF 4.3 ) Pub Date : 2020-01-24 , DOI: 10.1016/j.bbabio.2020.148157
Swetha Pavani Rao 1 , Neelam Sharma 1 , Shasi V Kalivendi 1
Affiliation  

Parkinson's disease (PD) is a chronic neurodegenerative disease characterized by the death of dopamine neurons of Substantia nigra pars compacta (SNpc) leading to motor deficits. Amongst the mechanisms proposed, mitochondrial dysfunction, reduced complex-I and PGC1α levels were found to correlate with the pathology of PD. As embelin is a natural product with structural resemblance to ubiquinone, exhibits mitochondrial uncoupling and antioxidant effects, in the present study, we sought to examine its role in the mechanisms mediating PD. Results indicate that embelin protects from MPP+-induced oxidative stress and apoptosis in a time and dose-dependent manner in N27 dopaminergic cells. Cells treated with embelin exhibited increased levels of pAMPK, SIRT1 and PGC1α leading to enhanced mitochondrial biogenesis. Though treatment of cells with MPP+ also increased pAMPK levels, but, SIRT1 and PGC1α levels decreased substantially, possibly due to the block in the mitochondrial electron transport chain and reduced NAD/NADH levels. The mitochondrial uncoupling effects of embelin leading to increased NAD/NADH levels followed by enhanced SIRT1, PGC1α and mitochondrial biogenesis were found to confer embelin mediated protection as treatment of cells with SIRT1 inhibitor or siRNA nullified this effect. Embelin (10 mg/kg) also conferred protection in vivo in MPTP mouse model of PD, wherein, MPTP-induced loss of TH staining, reduced striatal dopamine and markers of mitochondrial biogenesis pathway were averted by embelin.

中文翻译:

Embelin通过激活SIRT1避免了线粒体生物能学和生物发生中MPTP诱导的功能障碍。

帕金森氏病(PD)是一种慢性神经退行性疾病,其特征是黑质致密部(SNpc)的多巴胺神经元死亡,导致运动缺陷。在提出的机制中,发现线粒体功能障碍,复合物I和PGC1α水平降低与PD的病理相关。由于Embelin是与泛醌结构相似的天然产物,具有线粒体解偶联和抗氧化作用,因此在本研究中,我们试图研究其在介导PD的机制中的作用。结果表明,在N27多巴胺能细胞中,栓塞以时间和剂量依赖性方式保护MPP +诱导的氧化应激和细胞凋亡。用栓子处理的细胞表现出增加的pAMPK,SIRT1和PGC1α水平,从而导致线粒体生物发生增强。尽管用MPP +处理细胞也可提高pAMPK水平,但SIRT1和PGC1α的水平却大大降低,这可能是由于线粒体电子传输链受阻以及NAD / NADH的水平降低所致。发现栓塞的线粒体解偶联作用导致NAD / NADH水平升高,继之以增强的SIRT1,PGC1α和线粒体生物发生,赋予栓塞介导的保护作用,因为用SIRT1抑制剂或siRNA处理细胞可消除这种作用。Embelin(10 mg / kg)还在PD的MPTP小鼠模型中提供了体内保护,其中,通过embelin避免了MPTP诱导的TH染色的丧失,纹状体多巴胺减少和线粒体生物发生途径的标志物。可能是由于线粒体电子传输链受阻以及NAD / NADH含量降低。发现栓塞的线粒体解偶联作用导致NAD / NADH水平升高,继之以增强的SIRT1,PGC1α和线粒体生物发生,赋予栓塞介导的保护作用,因为用SIRT1抑制剂或siRNA处理细胞可消除这种作用。Embelin(10 mg / kg)还在PD的MPTP小鼠模型中提供了体内保护,其中,通过embelin避免了MPTP诱导的TH染色的丧失,纹状体多巴胺减少和线粒体生物发生途径的标志物。可能是由于线粒体电子传输链受阻以及NAD / NADH含量降低。发现栓塞的线粒体解偶联作用导致NAD / NADH水平升高,继之以增强的SIRT1,PGC1α和线粒体生物发生,赋予栓塞介导的保护作用,因为用SIRT1抑制剂或siRNA处理细胞可消除这种作用。Embelin(10 mg / kg)还可以在PD的MPTP小鼠模型中提供体内​​保护,其中Embelin避免了MPTP诱导的TH染色丢失,纹状体多巴胺减少以及线粒体生物发生途径的标志物。发现PGC1α和线粒体的生物发生赋予了栓子介导的保护作用,因为用SIRT1抑制剂或siRNA处理细胞使这种作用无效。Embelin(10 mg / kg)还可以在PD的MPTP小鼠模型中提供体内​​保护,其中Embelin避免了MPTP诱导的TH染色丢失,纹状体多巴胺减少以及线粒体生物发生途径的标志物。发现PGC1α和线粒体的生物发生赋予了栓子介导的保护作用,因为用SIRT1抑制剂或siRNA处理细胞使这种作用无效。Embelin(10 mg / kg)还在PD的MPTP小鼠模型中提供了体内保护,其中,通过embelin避免了MPTP诱导的TH染色的丧失,纹状体多巴胺减少和线粒体生物发生途径的标志物。
更新日期:2020-01-24
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