氟对体外培养乳鼠软骨细胞增殖的影响

目的 探讨氟对体外培养乳鼠软骨细胞增殖的影响.方法 采用细胞培养的方法,原代培养昆明乳鼠软骨细胞,传第3代后按染氟剂量不同分为O(对照)、5、10、20、40 ms/L组,10 d后光、电镜观察软骨细胞形态学变化;采用生长曲线、噻唑蓝(MTT)方法,在染氟24、48、72 h测定细胞数量变化及细胞增殖率.结果 染氟10 d后,镜下0、5、10mg/L组软骨细胞表现为增殖,细胞生长旺盛,均可见部分细胞核中核仁数增加:40mg/L组部分软骨细胞中有染色质固缩或凝结成块状,可见到凋亡细胞.在染氟24 h,细胞增殖活力各染氟组组间比较差异无统计学意义(F=2.313,P＞0.05).在染氟48、72 h,0 mg/L组[(23.5±4.6)%、(29.9±1.7)%]、5mg/L组[(34.6±4.7)%、(45.3±5.9)%]、10mg/L组[(39.9±4.8)%、(56.8±5.5)%]、20mg/L组[(31.8±4.1)%、(38.3±6.5)%]、40 mg/L组[(28.3±4.3)%、(33.4±4.8)%]组问比较差异有统计学意义(F值分别为11.401、25.671,P＜0.05);各染氟组细胞增殖活力与对照组比较差异均有统计学意义(P＜0.05),其中5、10ms/L组明显高于40mg/L组(P＜0.05).结论 低剂量氟在较短作用时间内可以促进体外培养小鼠软骨细胞的增殖,剂量升高时表现为抑制.     

对研究生学位论文质量有关问题的探讨

学位论文是指攻读博士学位、硕士学位人员撰写的学术研究性论文，是直接反映作者的实际研究能力和创新能力的重要材料，论文论证是否科学、严谨、规范和有无独创性，是证明研究生学业是否合格以及能否授予学位的主要依据。因此，做好研究生学位论文质量控制，是保证学位与研究生教育质量的重要环节。     

社会支持评定量表的信度效度研究

目的:检验社会支持评定量表的信度和效度,为国内社会支持研究提供有效的测评工具.方珐:采用整群抽样的方法,对268名脑力劳动者进行社会支持评定量表调查,社会支持评定量表包括主观支持、客观支持和支持的利用度3个维度.结果:3个维度可以解释总体方差的55.84%,分量表之间的相关系数为0.462～0.664,低于与总量表之间的相关,表明量表结构效度较高.3个分量表与总量表的相关系数为0.724～0.835,表明量表内容效度较高.总量表及3个分量表的a系数分别为0.896、0.849、0.825、0.833,表明量表信度较高.结论:社会支持评定量表具有良好的信度和效度,适合国内研究使用.     

慢性应激抑郁模型大鼠胶质纤维酸性蛋白和c-fos基因水平变化

目的 探讨孤养和慢性不可预知的温和应激(CUMS)对抑郁模型大鼠海马星形胶质细胞内胶质纤维酸性蛋白(GFAP)和c-fos基因表述的影响.方法 选取无特定病原体(SPF)级雄性Wistar大鼠30只,随机分为对照组和模型组,应用孤养和CUMS建立抑郁模型,刺激时间8周,免疫组化法检测海马GFAP和c-fos基因的表达.结果 模型组大鼠海马区GFAP表达增强,阳性细胞数增加,与对照组比较,差异有统计学意义(P＜0.05);而c-fos随着应激时间的延长,表达减弱.结论 孤养和CUMS可诱发抑郁,通过神经胶质细胞内GFAP和c-fos表达的变化,进而影响机体的行为及学习认知功能.     

职业紧张对脑力劳动者神经递质水平的影响研究

目的探讨脑力劳动者职业紧张对血浆神经递质水平的影响,从而为控制职业紧张、降低其危害提供科学依据。方法采用工作紧张测量问卷(Job Stress Survey,JSS)对200名工作时间超过1年及以上的脑力劳动者进行职业紧张状况的调查,并用酶联免疫法(enzyme linked immunosorbent assay,ELISA)测定其血浆5-羟色胺(5-hydroxy tryptamine,5-HT)、神经肽Y(neuropeptide Y,NPY)和P物质(substance P,SP)的浓度。结果不同个体特征组劳动者血浆5-HT、NPY及SP浓度的比较,只有5-HT浓度在不同年龄组间存在不同,且差异有统计学意义外(P0.05);中、高职业紧张组血浆5-HT浓度高于低职业紧张组,且差异有统计学意义(P0.05),而NPY和SP在不同职业紧张组间的比较,差异无统计学意义(P0.05);控制年龄因素后,偏相关分析结果显示职业紧张及其各维度与5-HT之间存在正相关性(P0.05),而与NPY和SP之间未发现明显相关性(P0.05)。结论职业紧张与脑力劳动者血浆神经递质水平存在相关性,尤其是单胺类神经递质5-HT。提示职业紧张可以影响机体神经递质水平,而这可能与长期过度职业紧张引发劳动者出现身心健康问题有关。     

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.     

新疆红树莓果实提取物降压作用及机制的实验研究

目的观察新疆红树莓果实乙酸乙酯提取物(EER)对自发性高血压大鼠(SHR)的降压作用,并从抗氧化角度探讨其降压作用机制,为红树莓的心血管保护作用提供科学依据。方法将32只16周龄雄性SHR随机分为:高血压对照组(SHR组)、EER低剂量组(EERL组)、EER高剂量组(EERH组)和卡托普利组(Cap组);另选8只WKY大鼠为正常血压对照组(WKY组)。采用无创尾压法测量血压,干预5周后检测大鼠NO、内皮素(ET)、MDA水平及总抗氧化能力(T-AOC)和超氧化物歧化酶(SOD)活性。结果与SHR组比较,Cap组、EERL组、EERH组大鼠于预后血压呈不同程度的下降趋势;EERL组大鼠NO、SOD明显升高(P<0.01);EERH组大鼠SOD、T-AOC明显升高(P<0.01),而ET、MDA明显下降(P<0.05)。结论EER对SHR的降压作用可能与其抗氧化作用有关。     

创伤后应激患者心理弹性水平的研究

目的:通过对创伤人群心理弹性水平的研究,探析不同创伤结局人群心理弹性差异,为降低创伤人群创伤后应激障碍的发病率,促进其精神心理健康转归,建立有效可行的干预模型提供理论依据。方法:采用整群分层抽样法抽取各大综合性医院的住院患者549名,进行问卷调查,探析心理弹性水平。再将创伤后应激障碍筛查结果阳性的患者作为病例组,阴性的患者作为对照组,比较两组心理弹性差异。结果:不同年龄段的个体心理弹性得分有显著差异,随着年龄的增高,心理弹性显著提高,差异有统计学意义(P<0.05,P<0.01);婚姻状况在个人强度分量表上的得分差异有统计学意义(P<0.05,P<0.01);不同职业人群的心理弹性得分在未来组织风格分量表上的差异有统计学意义(P<0.05)。Logistic回归分析表明:心理弹性的各因子得分及总分与PTSD的发病呈显著相关(P<0.01,OR=1.976),心理弹性得分较低的个体PTSD发病率明显高于心理弹性高的个体。结论:①个体心理弹性与创伤后应激障碍的发病有着密切的联系,心理弹性较低的个体比心理弹性高的个体更易患PTSD,可视为PTSD发病的高危人群;②随着年龄的增长,人生阅历的丰富,家庭及事业的稳定,个体的心理弹性也在不断增强。