大鼠肝细胞无血清原代培养体系的建立

目的:建立大鼠肝细胞无血清原代培养体系。方法:以Wistar大鼠做肝细胞供者,采用胶原酶肝脏原位灌流消化法分离肝细胞,分别通过有血清和无血清方法进行原代培养;以台盼蓝染色法测细胞活力,倒置显微镜观察肝细胞形态变化,流式细胞仪测定原代培养大鼠肝细胞增殖指数。结果:在大鼠肝脏有血清原代培养体系和无血清原代培养体系两种方法中,大鼠肝细胞存活率均>90%,生长良好,经24 h和48 h培养后,经检测大鼠肝细胞增殖指数无统计学差异(P>0.05)。结论:成功建立大鼠肝细胞无血清原代培养方法,为今后利用此方法进行细胞信号传导等相关研究提供有力的实验手段。     

氟化钠对人成骨肉瘤Saos-2细胞PI3K/Akt信号表达及凋亡的影响

目的观察氟化钠(NaF)对人成骨肉瘤Saos-2细胞磷脂酰肌醇-3-激酶/蛋白激酶B(PI3K/Akt)信号表达及凋亡的影响。方法采用成组设计,按NaF剂量将Saos-2细胞分为0(对照)、5、10、20、40 mg/L染氟组(n=3)。体外培养24、48 h后收集细胞,采用蛋白免疫印迹(Western blot)法检测PI3K、Akt和线粒体凋亡途径相关分子Forkhead转录因子(FoxO)1的蛋白表达,采用流式细胞仪检测Saos-2细胞的凋亡水平。结果体外培养24、48 h时,各组Saos-2细胞PI3K、Akt蛋白表达比较,差异均无统计学意义(P均>0.05)。24 h时,5、10、20、40 mg/L染氟组磷酸化PI3K(p-PI3K)蛋白表达(0.40±0.06、0.45±0.02、0.37±0.06、0.32±0.06)均高于对照组(0.28±0.04,P均<0.05);48 h时,5、10 mg/L染氟组p-PI3K蛋白表达(0.46±0.06、0.58±0.03)均高于对照组(0.29±0.04,P均<0.05),而40 mg/L染氟组(0.21±0.03)低于对照组(P<0.05)。24 h时,5、10、20 mg/L染氟组磷酸化Akt(p-Akt)蛋白表达(0.27±0.01、0.30±0.03、0.27±0.03)均高于对照组(0.20±0.02,P均<0.05);48 h时,5、10 mg/L染氟组p-Akt蛋白表达(0.42±0.04、0.60±0.02)均高于对照组(0.27±0.01,P均<0.05),而40 mg/L组(0.18±0.02)低于对照组(P<0.05)。24 h时,10、20、40 mg/L染氟组FoxO1蛋白表达(0.38±0.07、0.41±0.06、0.47±0.08)均高于对照组(0.34±0.04,P均<0.05);48 h时,5、10、20、40 mg/L染氟组FoxO1蛋白表达(0.36±0.08、0.37±0.10、0.54±0.04、0.73±0.04)均高于对照组(0.28±0.04,P均<0.05)。24、48 h时,对照组和5、10、20、40 mg/L染氟组细胞凋亡率分别为(2.867±0.583)%、(3.647±0.035)%、(3.773±0.095)%、(5.440±0.325)%、(7.203±0.476)%,(3.707±0.286)%、(4.023±0.241)%、(4.970±0.368)%、(12.473±0.949)%、(19.387±1.892)%。24 h时,40 mg/L染氟组凋亡水平高于对照组(P<0.05);48 h时,20、40 mg/L染氟组凋亡水平均高于对照组(P均<0.05)。结论氟可以直接激活成骨细胞内的PI3K/Akt信号通路,进而产生抗凋亡作用。     

哈萨克族食管癌差异表达基因的研究

 目的 筛选并克隆在哈萨克族食管鳞癌与正常食管组织之间差异表达的基因。方法 (1)应用抑制性消减杂交(SSH)进行基因差异表达分析，构建哈族食管鳞癌组织和正常食管黏膜组织之间差异表达的cDNA消减文库；(2)克隆、鉴定食管癌组织特异表达的基因；(3)登录Genbank．运用Blastn程序进行同源性分析。结果 成功构建了消减效率高的哈族食管鳞癌cDNA消成文库．对其中6个克隆的插入cDNA片断进行测序，经检索Genbank表明：这些差异表达基因与跨膜受体、乳腺癌转录因子、蛋白剪接基因及染色体1、8不同区域有较高的同源性。结论 通过抑制性消减杂交技术构建了哈族食管鳞癌cDNA消减文库，并分析鉴定了部分差异表达基因，为进一步筛选鉴定食菅鳞癌特异性基因及其全长克隆、功能研究等提供了依据。     

番茄红素干预食管癌细胞系(Eca9706)及表皮生长因子表达的研究

目的研究番茄红体外对食管癌细胞素(Eca9706)的作用及可能机制.方法番茄红素10-3、10-4、10-5、10-6、10-7 mol·L-15个浓度组干预食管细胞24 h,观察细胞存活量及蛋白含量,并用免疫组织化学的方法观察干预前后表皮生长因子(EG-FR)的表达情况.结果番茄红素10-3mol·L-1时,促进肿瘤细胞生长,10-4、10-5、10-6mol·L-1有抑制肿瘤细胞生长作用,而且10-4mol·L-1效果最好,10-7mol·L-1对抑制瘤生长效果不明显,仅有轻度抑制作用(P＞0.05).而蛋白含量仅有10-6和10-7mol·L-1有轻度抑制作用但无统计学意义(P＞0.05).免疫组织化学结果显示,干预前有PGFR表达,干预后未见表达.结论番茄红素对食管癌细胞系(ECA9706)有抑制生长作用,呈剂量反应关系,此作用与抑制EGFR蛋白表达有关.     

氟影响成骨细胞转化生长因子超家族成员表达的传导通路

背景：氟中毒骨转换过程中转化生长因子β超家族成员参与了骨转换过程,但是机制不清楚。 目的：观察氟对体外培养成骨细胞中转化生长因子β1,骨形态发生蛋白2和SMAD4信号转导通路的影响。 方法：体外培养人成骨细胞,按染氟(NaF)剂量将成骨细胞分为0(对照),0.625,1.25,2.5,5,10,20,40,80,160 mg/L组进行实验观察。 结果与结论：氟对成骨细胞增殖影响与转化生长因子β1,骨形态发生蛋白2表达有密切的关系。当氟质量浓度为0．625 mg/L时,氟化物产生的效应主要通过转化生长因子β1,骨形态发生蛋白2,SMAD4信号转导通路调节。当低于或超过此剂量时,氟化物产生的效应与信号转导通路关系不大,可能存在转化生长因子β1及骨形态发生蛋白2其他传导通路的调节。     

过量氟暴露对成骨细胞微小染色体维系蛋白3及成骨相关基因表达的影响

Objective To study the effects of fluoride on minichromosone maintenance(MCM)3 mRNA and the bone formation-related gene:bone sialoprotein(BSP),osteocalcin(OC),osteopontin(OP)mRNA expression on human osteoblast cells.The expression of MCM3 was tested for diagnosis and surveillance value on osteoblast treated with excess fluoride.Methods Human osteoblast cell(Saos-2)was cultured in McCoy5A medium and treated with fluoride(sodium fluoride,NaF).There were eight groups including:0(control),0.625,1.250,2.500,5.000,10.000,20.000,40.000 mg/L groups.Expression of MCM3,BSP,OC,OP mRNA were detected by real-time PCR.Dual-standard curve method was used for analysis.ALPase was determined by measuring the absorbance using a micro titer plate reader. Results Expression of MCM3 mRNA was lower in the 0.625,1.250,2.500,5.000,20.000, 40.000 mg/L groups(0.059 ± 0.003,0.027 ± 0.001,0.272 ± 0.004,0.115 ± 0.002,0.137 ± 0.004,0.754 ±0.002, all P > 0.05) and was higher in10.000 mg/L group(21.300 ± 1.200, P < 0.01 ) than control group( 1.000 ±0.020), especially 10.000 mg/L group was higher than groups treated with fluoride(all P < 0.01 ), the differences among groups were significant(F = 305.842, P < 0.01 ). Expression of BSP mRNA was significantly higher in 0.625,1.250,2.500,5.000,10.000 mg/L groups(71.80 ± 3.60,133.00 ± 7.20,85.50 ± 0.60,80.90 ± 1.20,304.00 ± 21.00)than the control group( 1.00 ± 0.04), especially 10.000 mg/L group was higher than others groups treated with fluoride(all P < 0.01 ), the differences among groups were signifieant(F = 159.531, P < 0.01 ). Expressions of OC mRNA were higher in 0.625,1.250,2.500,5.000 mg/L groups(110.00 ± 12.00,143.00 ± 2.10,90.60 ± 4.10,23.70±1.20) than control group(1.00 ± 0.01, all P < 0.01), and the differences among groups were significant (F = 158.734, P < 0.01 ). Expression of OP mRNA were higher in 0.625,1.250,2.500,5.000,10.000,20.000 mg/L groups(167.00 ± 11.20, 111.00 ± 12.10,72.50 ± 3.50,134.00 ± 14.00,42.30 ± 2.40,45.20 ± 3.30) than the control group(1.00 ± 0.04, all P < 0.05 or < 0.01 ), the differences among groups were significant(F = 60.226, P < 0.01 ).Compared with control group(4.2 ± 1.2), the ALPase activity was increased in all groups treated with fluoride (6.0 ± 0.4,5.8 ± 0.1,5.7 ± 0.4,7.7 ± 1.1,19.2 ± 2.4,8.5 ± 3.0,18.1 ± 4.2), but only 10.000 mg/L and 40.000 mg/L groups were higher than control group and other groups treated with fluoride(all P < 0.01 ), the differences among groups were signifieant(F = 7.806, P < 0.01 ). Conclusions Irregular expression of MCM3 mRNA is not suitable as a diagnostic and monitoring biomarker of osteoblasts exposed to excessive fluoride. Fluoride may affect the osteoblast-related gene expression and to promote osteogenic differentiation.     

过量氟暴露对成骨细胞微小染色体维系蛋白3及成骨相关基因表达的影响

Objective To study the effects of fluoride on minichromosone maintenance(MCM)3 mRNA and the bone formation-related gene:bone sialoprotein(BSP),osteocalcin(OC),osteopontin(OP)mRNA expression on human osteoblast cells.The expression of MCM3 was tested for diagnosis and surveillance value on osteoblast treated with excess fluoride.Methods Human osteoblast cell(Saos-2)was cultured in McCoy5A medium and treated with fluoride(sodium fluoride,NaF).There were eight groups including:0(control),0.625,1.250,2.500,5.000,10.000,20.000,40.000 mg/L groups.Expression of MCM3,BSP,OC,OP mRNA were detected by real-time PCR.Dual-standard curve method was used for analysis.ALPase was determined by measuring the absorbance using a micro titer plate reader. Results Expression of MCM3 mRNA was lower in the 0.625,1.250,2.500,5.000,20.000, 40.000 mg/L groups(0.059 ± 0.003,0.027 ± 0.001,0.272 ± 0.004,0.115 ± 0.002,0.137 ± 0.004,0.754 ±0.002, all P > 0.05) and was higher in10.000 mg/L group(21.300 ± 1.200, P < 0.01 ) than control group( 1.000 ±0.020), especially 10.000 mg/L group was higher than groups treated with fluoride(all P < 0.01 ), the differences among groups were significant(F = 305.842, P < 0.01 ). Expression of BSP mRNA was significantly higher in 0.625,1.250,2.500,5.000,10.000 mg/L groups(71.80 ± 3.60,133.00 ± 7.20,85.50 ± 0.60,80.90 ± 1.20,304.00 ± 21.00)than the control group( 1.00 ± 0.04), especially 10.000 mg/L group was higher than others groups treated with fluoride(all P < 0.01 ), the differences among groups were signifieant(F = 159.531, P < 0.01 ). Expressions of OC mRNA were higher in 0.625,1.250,2.500,5.000 mg/L groups(110.00 ± 12.00,143.00 ± 2.10,90.60 ± 4.10,23.70±1.20) than control group(1.00 ± 0.01, all P < 0.01), and the differences among groups were significant (F = 158.734, P < 0.01 ). Expression of OP mRNA were higher in 0.625,1.250,2.500,5.000,10.000,20.000 mg/L groups(167.00 ± 11.20, 111.00 ± 12.10,72.50 ± 3.50,134.00 ± 14.00,42.30 ± 2.40,45.20 ± 3.30) than the control group(1.00 ± 0.04, all P < 0.05 or < 0.01 ), the differences among groups were significant(F = 60.226, P < 0.01 ).Compared with control group(4.2 ± 1.2), the ALPase activity was increased in all groups treated with fluoride (6.0 ± 0.4,5.8 ± 0.1,5.7 ± 0.4,7.7 ± 1.1,19.2 ± 2.4,8.5 ± 3.0,18.1 ± 4.2), but only 10.000 mg/L and 40.000 mg/L groups were higher than control group and other groups treated with fluoride(all P < 0.01 ), the differences among groups were signifieant(F = 7.806, P < 0.01 ). Conclusions Irregular expression of MCM3 mRNA is not suitable as a diagnostic and monitoring biomarker of osteoblasts exposed to excessive fluoride. Fluoride may affect the osteoblast-related gene expression and to promote osteogenic differentiation.     

泡球蚴18基因的克隆、原核表达质粒的构建及其初步表达的研究

目的：克隆、分析泡球蚴18(Em18)抗原基因,构建pET41a-Em18原核表达质粒．并初步诱导表达Em18重组蛋白。方法：DNAman软件设计引物．RT-PCR法克隆Em18 cDNA并构建pMD18-T／Em18质粒，测序确定序列，利用DNAman和BLAST软件．对其进行基因序列分析。构建pET41a-Em18原核表达质粒，测序鉴定插入序列正确性。IPTG初步诱导和表达rEm18-GST重组蛋白。SDS-PAGE电泳检测。结果：测序结果显示Em18抗原基因长度为486bp，编码161个氨基酸。BLAST比对分析表明为一新序列并被GenBank收录(AY513691)。构建的pET41a-Em18原核表达质粒．经IPTG诱导后．SDS-PAGE检测表明rEm18-GST重组蛋白得到成功表达，在相对分子量为50KDa处有表达条带。结论：成功克隆并构建了pET41a-Em18原核表达质粒．初步诱导表达出rEm18-GST重组蛋白，为新一代包虫病诊断试剂盒的研制莫定基础。     

泡球蚴体外培养方法的改进及培养产物的初步鉴定

目的对泡球蚴体外培养模型进行改进,并对培养产物进行初步鉴定。方法培养肝癌细胞（Bel7404）,留取细胞上清液。取泡球蚴组织,用含肝癌细胞培养上清的DMEM完全培养基于37℃5%CO2培养箱中培养27 d。实验期间对囊泡进行计数,观察囊泡生长情况,记录囊泡最大、最小直径,绘制生长曲线。培养结束后,取培养囊泡壁及其囊液分别进行DNA鉴定和蛋白定量。结果泡球蚴在含肝癌细胞上清液的DMEM中能生长,囊泡直径0.5-5.0mm;囊液蛋白含量为1.8 mg/ml,囊壁DNA经PCR扩增出Em特异性200 bp条带。结论1）泡球蚴体外生长因素可不依赖培养细胞本身;2）由于体外与动物体内的培养环境的不同,可能引起囊泡内囊液的蛋白含量有所差异;3）DNA检测证明培养产物为泡球蚴;4）利用肝癌细胞上清液建立泡球蚴体外培养改良模型具有一定的可行性。     

泡球蚴体外培养方法的改进及培养产物的初步鉴定

目的 对泡球蚴体外培养模型进行改进,并对培养产物进行初步鉴定.方法 培养肝癌细胞(Bel7404),留取细胞上清液.取泡球蚴组织,用含肝癌细胞培养上清的DMEM完全培养基于37 ℃ 5% CO2培养箱中培养27 d.实验期间对囊泡进行计数,观察囊泡生长情况,记录囊泡最大、最小直径,绘制生长曲线.培养结束后,取培养囊泡壁及其囊液分别进行DNA鉴定和蛋白定量.结果 泡球蚴在含肝癌细胞上清液的DMEM中能生长,囊泡直径0.5～5.0 mm;囊液蛋白含量为1.8 mg/ml,囊壁DNA经PCR扩增出Em特异性200 bp条带.结论 1)泡球蚴体外生长因素可不依赖培养细胞本身;2)由于体外与动物体内的培养环境的不同,可能引起囊泡内囊液的蛋白含量有所差异;3)DNA检测证明培养产物为泡球蚴;4)利用肝癌细胞上清液建立泡球蚴体外培养改良模型具有一定的可行性.