Biochemistry Department, Faculty of Science, Ain-Shams University, Cairo, Egypt.
Therapeutical Chemistry Department, National Research Center, Dokki, Cairo, Egypt.
Biomed Pharmacother. 2017 Sep;93:837-851. doi: 10.1016/j.biopha.2017.07.038. Epub 2017 Jul 14.
Alzheimer's disease (AD) is a grave and prevailing neurodegenerative disease, characterized by slow and progressive neurodegeneration in different brain regions. Aluminum (Al) is a potent and widely distributed neurotoxic metal, implicated in the neuropathogenesis of AD. This study aimed to evaluate the possible neurorestorative potential of Vitis vinifera Leaves Polyphenolic (VLP) extract in alleviating aluminum chloride (AlCl)-induced neurotoxicity in male rats. AlCl neurotoxicity induced a significant decrease in brain/serum acetylcholine (ACh) contents and serum dopamine (DA) levels, along with a significant increment of brain/serum acetylcholinesterase (AChE) activities. In addition, Al treatment resulted in significantly decreased serum levels of both total antioxidant capacity (TAC) and brain-derived neurotrophic factor (BDNF), and significantly increased serum levels of both interleukin-6 (IL-6) and total homocysteine (tHcy), as compared to control. Behavioral alterations, assessed by the T-maze test, showed impaired cognitive function. Furthermore, AD-brains revealed an increase in DNA fragmentation as evidenced by comet assay. AlCl induction also caused histopathological alterations in AD-brain. Treatment of AD-rats with VLP extract (100mg/kg body weight/day) improved neurobehavioral changes, as evidenced by the improvement in brain function, as well as, modulation of most biochemical markers, and confirmed by T-maze test, the histopathological study of the brain and comet assay. The current work indicates that the VLP extract has neuroprotective, antioxidative, anti-inflammatory, and anti-amnesic activities against AlCl-induced cerebral damages and neurocognitive dysfunction.
阿尔茨海默病(AD)是一种严重且普遍的神经退行性疾病,其特征是不同大脑区域的神经退行性变缓慢且进行性。铝(Al)是一种强效且广泛分布的神经毒性金属,与 AD 的神经发病机制有关。本研究旨在评估葡萄叶多酚(VLP)提取物在缓解氯化铝(AlCl)诱导的雄性大鼠神经毒性方面的潜在神经修复作用。AlCl 神经毒性导致大脑/血清乙酰胆碱(ACh)含量和血清多巴胺(DA)水平显著降低,同时大脑/血清乙酰胆碱酯酶(AChE)活性显著增加。此外,与对照组相比,Al 处理导致血清总抗氧化能力(TAC)和脑源性神经营养因子(BDNF)水平显著降低,血清白细胞介素 6(IL-6)和总同型半胱氨酸(tHcy)水平显著升高。通过 T 迷宫测试评估的行为改变显示认知功能受损。此外,彗星试验表明 AD 大脑中的 DNA 片段化增加。AlCl 诱导也导致 AD 大脑中的组织病理学改变。用 VLP 提取物(100mg/kg 体重/天)治疗 AD 大鼠可改善神经行为变化,如改善大脑功能以及调节大多数生化标志物所证明的,并且通过 T 迷宫测试和大脑组织病理学研究以及彗星试验证实了这一点。目前的工作表明,VLP 提取物具有神经保护、抗氧化、抗炎和抗健忘活性,可对抗 AlCl 诱导的大脑损伤和神经认知功能障碍。