维格列汀在大鼠鱼藤酮帕金森病模型中的神经保护作用:晚期糖基化终末产物受体-核因子κB和核因子E2相关因子2-抗氧化信号通路的作用
Neuroprotective effects of vildagliptin in rat rotenone Parkinson's disease model: role of RAGE-NFκB and Nrf2-antioxidant signaling pathways.
作者信息
Abdelsalam Rania M, Safar Marwa M
机构信息
Faculty of Pharmacy, Department of Pharmacology and Toxicology, Cairo University, Cairo, Egypt.
出版信息
J Neurochem. 2015 Jun;133(5):700-7. doi: 10.1111/jnc.13087. Epub 2015 Mar 26.
Gliptins have been recently shown to conquer neuronal degeneration in cell cultures via modulating glucagon-like peptide (GLP)-1. This peptide produced in the gut not only crosses the blood-brain barrier but is also synthesized in the brain and acts on GLP-1R exerting central anti-inflammatory and antiapoptotic effects, thus impeding neuronal damage. This study investigated the antiparkinsonian effect of vildagliptin, a dipeptidyl peptidase (DPP)-4 inhibitor in a rat rotenone model targeting mainly the RAGE-NFκB/Nrf2-signaling pathways, to judge the potential anti-inflammatory/antioxidant effects of the drug. Vildagliptin markedly improved the motor performance in the open field and rotarod tests, effects that were emphasized by the accompanied reduction in striatal dopamine content. It modified the striatal energy level (ADP/ATP) associated with partial antagonism of body weight reduction. This incretin enhancer suppressed nuclear factor (NF)κB and, consequently, the downstream inflammatory mediator tumor necrosis factor-α. Normalization of receptor for advanced glycated end product (RAGE) is a main finding which justifies the anti-inflammatory effects of vildagliptin, together with hampering striatal inducible nitric oxide synthase, intracellular adhesion molecule-1 as well as myeloperoxidase. The antioxidant potential of vildagliptin was depicted as entailing reduction in thiobarbituric acid-reactive substances and the transcriptional factor Nrf-2 level. Vildagliptin guarded against neuronal demise through an antiapoptotic effect as reflected by the reduction in the mitochondrial matrix component cytochrome c and the key downstream executioner caspase-3. In conclusion, vildagliptin is endowed with various neuroprotective effects and thus can be a promising candidate for the management of Parkinson's disease. In the rat rotenone model of Parkinson's disease (PD), striatal RAGE/NFκB signaling was up-regulated associated with elevated levels of inflammatory, oxidative stress, and apoptotic mediators resulting in dopaminergic neurons death and hence motor impairment. Vildagliptin, a dipeptidyl peptidase (DPP)-4 inhibitor, blocked the RAGE/NFκB cascade exerting a potential antiparkinsonian effect. RAGE, receptor for advanced glycation end product; NFκB, nuclear factor κB; TNFα, tumor necrosis factor alpha; ICAM, intracellular adhesion molecule; iNOS, inducible nitric oxide synthase; MPO, myeloperoxidase.
近来研究表明,格列汀类药物可通过调节胰高血糖素样肽(GLP)-1来抑制细胞培养中的神经元变性。这种在肠道产生的肽不仅能穿过血脑屏障,还能在大脑中合成,并作用于GLP-1受体发挥中枢抗炎和抗凋亡作用,从而阻止神经元损伤。本研究在大鼠鱼藤酮模型中,主要针对晚期糖基化终末产物受体(RAGE)-核因子(NF)κB/核因子E2相关因子2(Nrf2)信号通路,研究二肽基肽酶(DPP)-4抑制剂维格列汀的抗帕金森病作用,以判断该药物潜在的抗炎/抗氧化作用。维格列汀显著改善了旷场试验和转棒试验中的运动表现,纹状体多巴胺含量的降低进一步强化了这些作用。它改变了与体重减轻部分拮抗相关的纹状体能量水平(二磷酸腺苷/三磷酸腺苷)。这种肠促胰岛素增强剂抑制了核因子κB,进而抑制了下游炎症介质肿瘤坏死因子-α。晚期糖基化终末产物受体(RAGE)的正常化是一项主要发现,这证明了维格列汀的抗炎作用,同时它还能抑制纹状体诱导型一氧化氮合酶、细胞间黏附分子-1以及髓过氧化物酶。维格列汀的抗氧化潜力表现为硫代巴比妥酸反应性物质和转录因子Nrf-2水平的降低。维格列汀通过抗凋亡作用防止神经元死亡,这表现为线粒体基质成分细胞色素c和关键下游执行因子半胱天冬酶-3的减少。总之,维格列汀具有多种神经保护作用,因此可能是治疗帕金森病的一个有前途的候选药物。在帕金森病(PD)的大鼠鱼藤酮模型中,纹状体RAGE/NFκB信号上调,同时炎症、氧化应激和凋亡介质水平升高,导致多巴胺能神经元死亡,进而引起运动障碍。二肽基肽酶(DPP)-4抑制剂维格列汀阻断了RAGE/NFκB级联反应,发挥了潜在的抗帕金森病作用。RAGE:晚期糖基化终末产物受体;NFκB:核因子κB;TNFα:肿瘤坏死因子α;ICAM:细胞间黏附分子;iNOS:诱导型一氧化氮合酶;MPO:髓过氧化物酶。