阿尔茨海默病与NQO1和载脂蛋白E基因多态性关联分析

目的　探讨NQO1基因C6 0 9T位点突变及其与载脂蛋白 (Apo)E基因相互作用在散发性阿尔茨海默病 (SAD)发病机制中的作用。方法　应用聚合酶链反应 限制性片段长度多态性 (PCR RFLP)方法检测了 92例SAD患者和 10 8例正常老年人NQO1基因和ApoE基因多态性分布特征。结果　NQO1T等位基因和T/C +T/T基因型频率SAD组分别为 5 6 %和 89% ,对照组分别为 4 5 %和 71%。SAD组ApoE2等位基因频率显著低于对照组 (χ2 =3.75 3,P <0 .0 5 ) ,而ApoE4等位基因频率高于对照组 ,但差异无显著意义 (χ2 =1.86 3,P =0 .172 )。同时 ,NQO1T/T和T/C基因型与SAD发病相关不受ApoE基因型影响。结论　NQO1基因多态性与中国汉族人SAD发病有明显关联。NQO1基因可能是中国汉族人SAD发病独立的易感基因。     

Lupeol: An antioxidant triterpene in Ficus pseudopalma Blanco (Moraceae)

Objective

To assess the antioxidant activity of Ficus pseudopalma Blanco (Moraceae) (F. pseudopalma) and characterize the active components present in it.

Methods

Column chromatography of crude ethanol leaf extract of F. pseudopalma was performed and seven fractions were obtained, labeled as F1, F2, F3, F4, F5, F6, F7. DPPH, FRAP, Griess, Fenton and superoxide radical scavenging assays were performed to assess the antioxidant ability of the fractions. Thin layer chromatography (TLC), high performance liquid chromatography and Fourier transfer infrared spectroscopy (FTIR) were performed to identify and characterize the bioactive component present in each fractions of F. pseudopalma.

Results

DPPH and FRAP assay showed that F5, F6 and F7 exhibited the good proton accepting ability and reducing power as compared to the other fractions. All fractions exhibited a good nitric oxide radical scavenging activity wherein F1, F2 and F3 showed the highest inhibition. However, all of the fractions exhibited a stimulatory activity on hydroxyl and superoxide radicals. Lupeol matched one of the spots on the thin layer chromatography chromatogram of the fractions. Linear gradient high performance liquid chromatography and spiking of lupeol with the fraction revealed the presence of 5.84 mg/L lupeol in F6. Infrared spectra of the fractions revealed the presence of C-C, OH, aromatic C=C and C=O groups.

Conclusions

The identified lupeol in F. pseudopalma may be responsible for the exhibited antioxidant property of the plant. Furthermore, knowing the antioxidant capability of the plant, F. pseudopalma can be developed into products which can help prevent the occurrence of oxidative stress related diseases.     

呼吸窘迫综合征β受体含量与病理变化的实验研究

作者用呼吸窘迫综合征(RDS)动物模型测定肺组织β受体含量,同时观察其病理变化,并选用几种药物进行阻断治疗研究。结果:RDS组β受体明显减少,病理损害严重,激素组其病理改变减轻,β受体含量接近正常组。本实验提示:RDS发病过程中存在病理损害程度与受体数目减少呈正相关的变化。肾上腺皮质激素有预防RDS和保护β受体的作用。     

兔实验性脑积水模型的建立

目的 建立兔实验性脏积水模型。方法取成年家兔28只，随机抽取分为实验组18只，对照Ⅰ组6只，对照Ⅱ组4只。全麻后，三组均测ICP。实验组取实验动物自体颈部肌肉5g加生理盐水2mL研浆，注入枕大池；对照组Ⅰ注入等量生理盐水，对照Ⅱ组仅行枕大池穿刺。19d后全麻，测ICP后断头处死，取全脑固定，切片，测量脑室大小。结果 实验组18只均出现枕大池及第4脑室流出道粘连、梗阻，形成梗阻性脑积水；手术前三组动物之间mICP差异无显著性（P〉0.05）；手术后实验组mICP明显高于对照Ⅰ组和对照Ⅱ组（P〈0．05），而对照Ⅰ组和对照Ⅱ组之间差异无显著性（P〉0.05）；实验组侧脑室、第4脑室明显大于对照Ⅰ、Ⅱ两组（P〈0.01），而对照Ⅰ、Ⅱ组之间差异无显著性（P〉0.05）。结论 用此方法建立的脑积水动物模型简便易行，重复性和稳定性好。采用自体肌浆作阻塞、粘连材祷术后反应轻，其病理过程更接近临床，适用于脑积水的实验研究。     

肺纤方对肺间质纤维化大鼠VEGF及VEGFR1、VEGFR2基因表达的影响

目的 探讨肺纤方提取物对肺间质纤维化大鼠血管新生的影响.方法 将大鼠分为假手术组、模型组、泼尼松组、氯沙坦组、肺纤方大剂量组、肺纤方中剂量组、肺纤方小剂量组7组,除假手术组外,其余6组采用气管插管灌注博莱霉素3 mg/kg进行大鼠肺间质纤维化造模;造模第2天各组予以相应药物灌胃干预.于第14天及第28天分2批进行取材,HE染色观察肺泡炎程度、MAS-SON染色观察肺纤维化程度,RT-PCR检测血管内皮生长因子(VEGF)、血管内皮生长因子受体(VEGFR)l、VEGFR2mRNA表达.结果 肺纤方大中剂量均能抑制肺泡炎和纤维化程度、下调VEGF及VEGFR1、VEGFR2mRNA表达水平(P＜0.05).肺纤方中剂量作用更显著.结论 肺纤方通过下调VEGF及VEGFR1、VEGFR2基因表达水平,抑制血管新生,发挥抗肺纤维化作用.