白细胞介素-10基因多态性与乙型肝炎病毒感染的关系

目的:探讨中国人白细胞介素-10基因启动子单核苷酸多态性与乙型肝炎病毒感染之后临床发展之间的关系.方法:分别采用聚合酶链反应-限制性片段长度多态性分析法(PCR-RFLP)和聚合酶链反应-序列特异性引物扩增法(PCR-SSP)检测478例慢性乙型肝炎患者,223例乙肝病毒携带者及267例自限性感染者基因组DNAIL-10基因启动子区域3个多态位点-592、-819、-1082的基因多态性,并进行相关性分析.结果:IL-10-1082A等位基因及AA基因型在慢性乙型肝炎患者组的频率明显高于自限性感染者组和乙肝病毒携带者组(A:χ2=37.72,P=0.000;χ2=45.23,P=0.000;AA:χ2=20.53,P=0.000;χ2=19.14,P=0.000).IL-10-819T等位基因及TT基因型在慢性乙型肝炎患者组的频率也高于自限性感染者组和乙肝病毒携带者组(T:χ2=10.5,P<0.001;χ2=17.38,P<0.001;TT:χ2=8.76,P=0.003;χ2=5.656,P=0.017).IL-10-592C/A等位基因频率和AA/CC/AC基因型在三组的分布没有统计学意义(P>0.05).结论:IL-10基因启动子多态性与乙肝病毒感染后临床发展过程可能相关.     

肝病患者血清肝纤维化指标临床意义的探讨

目的:探讨肝纤维化指标透明质酸(HA)、Ⅲ型前胶原肽(PⅢNP)、层粘蛋白(LN)和Ⅳ型胶原(CⅣ)对肝病的诊断价值。方法:用ELISA方法对247例肝病患者和34例健康对照者血清中HA、PⅢNP、LN和CⅣ进行检测,并将两组进行比较。结果:HA、LN和CⅣ含量在酒精性肝病、慢性乙肝、慢性丙肝和肝硬化患者与对照组比较均有显著性差异(P<0.05)。结论:HA、LN和CⅣ联合测定可较好反映肝纤维化程度。     

Influence of interferon-α therapy on CD8 T memory subsets in patients with chronic hepatitis B

Objective To investigate the influence of interferon-a therapy on CD8 T memory subsets in patients with chronic hepatitis B(CHB) and correlation between the effect of IFN-α and CD8 T memory subsets. Methods Blood samples from 57 patients with CHB were collected before treatment (0 week), at 12 weeks and 24 weeks of treatment with pegylated IFN-α. Assays were performed on freshly isolated peripheral blood mononuclear cells ( PBMCs). For phenotype analysis, All data were acquired on a flow cytometer instrument and prepared for analysis. Results A significantly higher frequency of CD8+ TEM and lower frequency of CD8+ TCM in inactive HBsAg carriers than that in CHB patients prior to treatment was observed (P <0.05). The proportion of CD8 + TCM was higher in group nonresponders than in group respond-ers, and the proportion of CD8 + TEM was lower in group nonresponders than in group responders (P < 0.05 ). The average dosage of IFN-α applied to patients with response was significantly higher than nonresponders. Conclusion The dominance of circulating effector memory T cells may be associated with elimination of viral infection, and possibly benefit for response to therapy with IFN-α.     

饥饿诱导DRAM介导的自噬与HepG2和Hep3B细胞凋亡的关系

目的探讨饥饿诱导损伤调节自噬调控基因(DRAM)介导的自噬在HepG2细胞和Hep3B细胞凋亡中的作用。方法 HepG2细胞和Hep3B细胞经饥饿处理后,观察DRAM的表达和自噬的发生;利用DRAM小干扰RNA(siRNA)阻断DRAM,观察饥饿诱导的自噬水平;采用Calcein AM/PI染色,观察DRAM siRNA对饥饿引起的细胞凋亡的影响。结果经饥饿处理后12、24、36h,HepG2细胞和Hep3B细胞内DRAMmRNA均显著高于处理前(P﹤0.001),细胞凋亡明显增加(P﹤0.01),但两种细胞系间细胞凋亡计数的差异无统计学意义。DRAM siRNA阻断DRAM的功能后,HepG2和Hep3B细胞自噬减少,但对饥饿引起的细胞凋亡没有明显影响。结论 DRAM参与了饥饿诱导的自噬,可能不是饥饿引起肝癌细胞凋亡的机制。     

Influence of interferon-α therapy on CD8 T memory subsets in patients with chronic hepatitis B

Objective To investigate the influence of interferon-a therapy on CD8 T memory subsets in patients with chronic hepatitis B(CHB) and correlation between the effect of IFN-α and CD8 T memory subsets. Methods Blood samples from 57 patients with CHB were collected before treatment (0 week), at 12 weeks and 24 weeks of treatment with pegylated IFN-α. Assays were performed on freshly isolated peripheral blood mononuclear cells ( PBMCs). For phenotype analysis, All data were acquired on a flow cytometer instrument and prepared for analysis. Results A significantly higher frequency of CD8+ TEM and lower frequency of CD8+ TCM in inactive HBsAg carriers than that in CHB patients prior to treatment was observed (P <0.05). The proportion of CD8 + TCM was higher in group nonresponders than in group respond-ers, and the proportion of CD8 + TEM was lower in group nonresponders than in group responders (P < 0.05 ). The average dosage of IFN-α applied to patients with response was significantly higher than nonresponders. Conclusion The dominance of circulating effector memory T cells may be associated with elimination of viral infection, and possibly benefit for response to therapy with IFN-α.     

巢式PCR检测北京地区乙型肝炎病毒基因型的分布

目的了解北京地区乙型肝炎病毒(HBV)感染者HBV基因型分布情况。方法从前S1基因到S基因中的保守序列设计出10条内外引物,将其中8条内引物分成A、B组,分别扩增A、B、C、D、E、F型HBV,根据PCR产物片断判定HBV基因型。结果用此种方法检测HBV感染的不同转归类型患者血清728份,对HBV DNA阳性标本进行基因型分析。HBV DNA阳性者276例,其中自限性感染者阳性率为5.8%(14/243),慢性无症状HBV携带者血清HBV阳性率为42.6%(113/265),慢性肝炎患者HBV阳性率为67.7%(149/220)。慢性肝炎组HBV DNA检出率与其他2组比较差异有统计学意义(P<0.05)。在276例HBV DNA阳性标本中,各基因型在不同组分布不同,但差异无统计学意义。HBV基因型总检出率以C型为主,占76.8%,B型占21·7%,同时检出B型和C型为1.5%,未检出A、D、E、F基因型。结论北京地区感染HBV基因型为B型和C型,以C型为主,感染结局不同组间基因型分布比较差异无统计学意义。     

棕榈酸对肝癌HepG2细胞自噬和凋亡的影响

目的探讨棕榈酸对肝癌HepG2细胞自噬和凋亡的影响。方法采用含浓度为800txmol／L棕榈酸的DMEM高糖培养基培养肝癌HepG2细胞24h,向HepG2细胞转染绿色荧光蛋白（GFP）-LC3质粒,通过观察LC3II绿色荧光斑点确定自噬发生情况。利用BafAl抑制自噬后,采用M30免疫荧光检测细胞凋亡情况。结果棕榈酸刺激24h明显增加自噬及凋亡细胞数量。阻断自噬,棕榈酸刺激引起的HepG2细胞凋亡水平明显增加。结论棕榈酸可刺激自噬发生,该自噬对肝癌HepG2细胞有一定的保护作用。     

HIV感染儿童抗病毒治疗后外周血单个核细胞的TK2表达水平及意义

目的探讨艾滋病病毒(HIV)感染儿童抗病毒治疗后外周血单个核细胞(PBMC)中潜在线粒体毒性标志物表达水平及其相关机制。方法选择60例抗病毒治疗的HIV感染儿童和20例健康儿童,检测PBMC中胸苷激酶2(TK2)基因的mRNA和蛋白质表达水平变化,与治疗方案及治疗时间的相关性分析。结果 HIV感染患儿抗病毒治疗的PBMC中TK2基因mRNA和蛋白质表达水平显著高于对照组儿童(mRNA:2.45/1,蛋白质:3.2/1)差异均有统计学意义(P<0.05)。随着治疗时程的增加,司他夫定治疗组较齐多夫定治疗组的TK2蛋白质水平增加更显著(P<0.05)。将患儿分别按基线CD4+T淋巴细胞计数、基线病毒载量、性别、年龄以及HIV传播途径进行分组比较,各组患儿间TK2水平差异无统计学意义(P>0.05)。结论外周血PBMC的TK2水平可反映儿童抗病毒治疗后的线粒体毒性,有望成为线粒体毒性检测指标。     

饥饿诱导DRAM介导的自噬与肝细胞凋亡的关系

目的探讨在饥饿情况下,自噬与正常肝脏细胞凋亡的关系,及凋亡与损伤调节自噬调控基因(dam-age-regulated autophagy modulator,DRAM)介导的自噬之间的关系。方法采用无血清培养基培养正常肝脏细胞系7702细胞36h,采用M30免疫荧光染色观察凋亡,采用免疫印记检测自噬和DRAM基因的表达水平;并用DRAM特异的小干扰RNA(siRNA)阻断DRAM作用后,观察凋亡和自噬的水平。结果和0h相比,在12、24和36h3个时间点,饥饿可明显诱导7702细胞凋亡(P<0.001)。免疫印记结果显示,饥饿后第12、24和36小时的DRAM水平和自噬水平均逐渐增高,两两比较,差异有统计学意义(P<0.05)。用DRAMsiRNA阻断DRAM功能后,在12、24和36h未检测到DRAM的表达,同时凋亡细胞数明显下降(P<0.05)。DRAMsiRNA阻断DRAM功能后,在12、24和36h的自噬水平无明显差异。结论 DRAM介导的自噬可导致正常肝脏细胞凋亡,其对凋亡的影响可能成为肝癌研究的新思路。     

芪参益气滴丸抗大鼠肝纤维化的实验研究

目的研究芪参益气滴丸抗肝纤维化的作用机制。方法60只大鼠随机分为正常组、模型组、干预组、对照组及芪参益气滴丸组（简称治疗组）。采用二甲基亚硝胺腹腔内注射建立肝纤维化大鼠模型。按6期分类法评价各组肝纤维化程度。应用RT—PCR检测各组肝组织中Ⅰ、Ⅲ型胶原和1型组织性基质金属蛋白酶抑制物（TIMP-1）mRNA水平;应用免疫组织化学技术检测各组动物肝组织Ⅰ、Ⅲ型胶原和TIMP-1的表达。结果干预组与治疗组大鼠肝纤维化程度、肝组织中Ⅰ型与Ⅲ型胶原和TIMP—1mRNA水平及肝组织中Ⅰ型与Ⅲ型胶原和TIMP-1的阳性表达均分别较模型组与对照组显著减轻与下降。结论芪参益气滴丸能明显减轻肝组织病理改变和肝纤维化程度,抑制Ⅰ、Ⅲ胶原和TIMP-1的表达是其抗肝纤维化的部分机制。