目的迟发性阿尔茨海默病(LOAD)是老年痴呆中最常见的一种,它是一种病因复杂、由遗传因素和环境等其他因素共同作用引起的老年期疾病。服用非甾类抗炎类药物能延缓或防止其发病,说明炎症反应可能参与病理,肿瘤坏死因子(TNF)是炎症反应中主要的细胞因子。方法采用病例对照研究设计,通过聚合酶链反应(PCR)和限制性片段长度多态性(RFLP)的方法,分析中国南方人群81例病例和158例正常对照组中TNFa-308和载脂蛋白E(ApoE)等位基因和基因型频率的差异。结果TNFa-308等位基因和基因型在病例对照中的分布无统计学差异;在LOAD病例组和正常对照组中,ApoEe4等位基因出现的频率分别为16.3%,7.9%,等位基因频率有显著差异(P=0.019);与非84携带者相比,ApoEe4等位基因携带者发生AD的风险增大[OR(95%CI)=2.304(1.182~4.489),P=0.015]。结论TNFa-308(rs1800629)可能与中国南方人阿尔茨海默病患病风险无关,ApoE甜等位基因可能是LOAD的遗传危险因子。
Objective Late-onset Alzheimer's disease(LOAD)is the most common cause of dementia in the elderly. It is a complex and genetically heterogeneous disorder. Epidemiological studies demonstrated that nonsteroidal anti-inflammatory drugs could prevent or delay the onset of LOAD suggesting inflammation may be involved in AD. Tumor necrosis factor(TNF) is a potent immunomodulator. Methods We evaluated the association of TNFa-308 G 〉 A and apolipoprotein E (APOE) polymorphism with 81 Late-onset Alzheimer's disease patients and 158 controls from southern Chinese population who were genotyped by Polymerase Chain Reaction(PCR) and Restriction fragment length polymorphism(RFLP) techniques in a case-control study. Results Allele and genotype of the TNF alpha 308 have no statistical difference in case-control; Among the LOAD group and the controls group, the frequency of ApoEe,4 allele is 16. 3% , 7.9% , respectively. There is an obvious difference between them (X2 = 15.75 ; P-value = 0. 001, OR = 3. 396,95% CI = 1. 808 -6. 379) ;Compared with the ApoEe4 allele non-carriers, ApoEε4 allele carriers increased risk for AD (OR = 2. 304 (95% CI) ( 1.182 4. 489 ), P = 0. 015 ). Conclusion This study shows that TNF alpha 308 (rs1800629)may be not related to with AD in China southern population, ApoEε4 allele may be a genetic risk factor of the LOAD.