流行病学统计显示,吸烟者患帕金森氏综合症(PD)和老年痴呆症(AD)的概率远低于不吸烟者,但是其机理还不清楚。我们研究发现:(1)烟碱可以有效清除活性氧自由基,能够抑制多巴胺自氧化,是一个抗氧化剂。(2)烟碱能够有效抑制6-OHDA和MPP^+诱导的线粒体肿胀和细胞色素C(Cyt.C)释放。(3)烟碱可以保护海马神经元抵抗邯淀粉样蛋白诱导细胞的凋亡。(4)烟碱可以防止淀粉样蛋白在转基因AD鼠脑沉淀。(5)烟碱可以络合金属铜防止和减少其在脑中积聚。这对于解释烟碱防治神经退行性疾病AD和PD机理具有重要意义。
Epidemic results show that cigarette smoker has decreased risk of developing Parkinson' s disease (PD) and Alzheimer's disease (AD) although the mechanism has not been identified. Current study found that: (1) Nicotine scavenged hydroxyl and superoxide free radical and inhibit oxidation of 6-OHDA. (2) Nicotine inhibited the oxidation of 6-OHDA and Nmethyl-g-phenylpyridine (MPP^+ ) induced mitochondria high-amplitude swelling and cytochrome C released from intact mitochondria. (3) Nicotine protected cultured hippocampal neurons against A(βinduced apoptosis. (4) Nicotine prevented Aβ and copper deposition in the brain of transgenic APP^V7171 mouse. These results are of great importance in explaining the preventive effects of nicotine against cell apoptosis in neurodegenerative diseases.