全反式维甲酸在多发性骨髓瘤治疗中的作用

目的　探讨全反式维甲酸治疗多发性骨髓瘤的作用机理及其临床效果。方法　采用MTT法、双抗体夹心ELISA法检测了 17例多发性骨髓瘤患者应用全反式维甲酸治疗前后骨髓上清中IL 6活性及可溶性IL 6受体(sIL 6R)水平。结果　与对照组相比 ,多发性骨髓瘤患者骨髓上清中IL 6活性及sIL 6R水平明显高于对照组 (P<0 .0 1) ,应用全反式维甲酸 5 0d后多发性骨髓瘤患者骨髓上清中IL 6活性及sIL 6R水平明显降低 (P <0 .0 1) ,Ⅲ期多发性骨髓瘤患者的IL 6活性显著高于Ⅰ、Ⅱ期 (P <0 .0 5 ) ,但sIL 6R水平二者无显著性差异 (P >0 .0 5 )。用全反式维甲酸治疗的 17例患者 ,5例完全缓解 (CR)、8例部分缓解 (PR)、4例未缓解 (NR)。结论　全反式维甲酸可能是通过降低IL 6活性及sIL 6R水平而抑制肿瘤细胞生长 ,提高缓解率 ,可作为IL 6活性及sIL 6R水平高的多发性骨髓瘤患者的有效治疗药物     

单纯疱疹病毒1型糖蛋白D核酸疫苗的构建及初步免疫观察

目的　构建用于防治单纯疱疹的核酸疫苗并观察其免疫效果。方法　用PCR反应 ,从HSV 1F株基因组DNA中扩增出 gD蛋白的全部编码序列 ,将其插入 pcDNA 3 1 (+)的PCMV下游 ,构建HSVgD核酸疫苗 ,并用酶切分析和测序鉴定 ;通过中和试验、ELISA方法和攻击试验检测用 pLy D三次肌肉接种小鼠的免疫效果。结果　经鉴定证实了HSV gD核酸疫苗 pLy D的构建 ;实验小鼠产生了对HSV 1特异性的抗体 (抗体滴度 :ELISA法 1∶2 0 3,中和试验法 1∶37) ,并经受了HSV 1病毒的攻击 (存活率 :70 % )。结论　成功构建出了HSV gD核酸疫苗pLy D ,用其接种小鼠可以诱导产生特异性免疫反应 ,并具有良好的保护作用。     

重组人生长激素、雌激素联合应用对去势大鼠剩余牙槽骨吸收的影响

目的观察重组人生长激素(r-HGH)、雌激素(estrone,E2)及两者联合应用对抗酒石酸酸性酶(TRAP)的活性及剩余牙槽骨骨形态计量学指标的影响,以明确两药单用及联合应用延缓骨质疏松(OP)所致的剩余牙槽骨吸收及其机制。方法通过去除SD大鼠双侧卵巢,拔除单侧上颌磨牙,建立去势大鼠剩余牙槽骨动物模型,建模成功后分为模型组和治疗组,治疗组分别给予r-HGH、E2单用及联合治疗。药物治疗4周及8周后,检测各组血清TRAP含量及形态计量学指标的改变。结果①E2治疗组(ERT)、联合治疗组(Er-HGHT)TRAP含量低于模型组(P<0.05),差异有统计学意义;ERT、Er-HGHT两组TRAP含量基本相同,但都与r-HGH治疗组(r-HGHT)有统计学差异(P<0.05)。②去势可使大鼠剩余牙槽骨的骨小梁面积比减少,宽度减小,髓腔扩大,加速剩余牙槽骨的吸收。r-HGH、E2单用及两者联合应用4周及8周后可提高去势大鼠剩余牙槽骨的骨小梁宽度、骨小梁面积视野百分比,降低骨小梁间隙宽度。结论r-HGH、E2单用及两者联合应用在一定程度上延缓骨质疏松大鼠剩余牙槽骨的快速吸收。     

INHIBITION AND RADIATION SENSITIZING EFFECT OF INDOLEACETIC ACID COMBINED WITH HORSERADISH PEROXIDASE ON HELA CELLS

Indoleaceticacid (IAA )isagrowthhormoneforplants.ResearchinrecentyearshasshownthatIAApresentsacytotoxiceffectonhumancancersaf teritisoxidizedbyhorseradishperoxidase (HRP) .Becauseoflowtoxicityandstrongeffectonanaero biccells ,ithasattractedpeople sattentionasapro drugfortargettreatmentofcancers .ItsmechanismmightberelatedwiththefactthatIAAisoxidizedinthecellsofthelivingbodytoproducefreeradi cals.Theanaerobiccellgroupsincancersareoneofthemaincausesforradiationresistance .Therehavebeenfewr…     

硒对胎鼠肝细胞核酸及蛋白质合成的影响

本文报道了微量元素硒对培养纯种Wistar大白鼠胎肝细胞核酸及蛋白质合成的影响。观察了肝细胞培养基中不同硒水平对~3H-TdR(~3H-脱氧胸苷)、~(14)C-UR(~(14)C-尿苷)参入率的影响,同时还测定了培养基中白蛋白及甲胎蛋白(AFP)的含量。结果显示:细胞培养基中硒(Se)浓度在0.4～0.6μg/ml范围内使~3H-TdR、~(14)C-UR的参入率、白蛋白及甲胎蛋白含量均明显高于不补硒组。说明硒在这一浓度范围内能促进肝细胞DNA、RNA更新率及蛋白质合成。     

抗坏血酸体系羟自由基的产生与测定

用苯甲酸羟基化产物的荧光检测了Ｆｅｎｔｏｎ反应产生的羟自由基，结果表明，在适当条件下，抗坏血酸可显著促进羟自由基的生成，抗坏血酸亦是一种有效的羟自由基清除剂。用高效液相色谱首次从Ｆｅｎｔｏｎ类型反应体系中分离出高荧光的２－羟基苯甲酸，定量测定了３种主要羟基化产物，从而能够初步计算反应体系中羟自由基的数量。     

葡萄糖、胰岛素和尿酸对猪近端肾小管上皮细胞株血红素氧合酶-1的影响

目的观察不同浓度葡萄糖、胰岛素和尿酸的培养条件下猪近端肾小管上皮细胞株(LLC-PK1)血红素氧合酶(HO-1)活性的改变,以探讨代谢相关因素在细胞水平对肾小管上皮细胞的影响。方法以LLC-PK1为研究对象,观察葡萄糖浓度为5、10、22、33 mmol/L,胰岛素浓度为0、10-9、10-8、10-7mol/L,尿酸浓度为0、0.1、0.2、0.4 mmol/L培养48 h条件下,LLC-PK1细胞HO-1活性的改变。结果0.1 mmol/L0、.2 mmol/L和0.4 mmol/L尿酸刺激48 h后,LLC-PK1的HO-1活性增加,并呈剂量依赖关系,而上述浓度的葡萄糖和胰岛素刺激48 h对LLC-PK1的HO-1活性无影响。结论一定浓度的尿酸可使LLC-PK1的HO-1活性升高,提示尿酸在细胞水平对肾小管上皮细胞的氧化应激过程产生影响。     

Investigating the Interaction Between Gluconobacter Oxydans and Bacillus M egaterium for 2-keto-L-gulonic Acid Biosynthesis in the Two-Step Vitamin C Fermentation

In the two-step vitamin C fermentation process, its precursor 2-keto-L-gulonic acid was synthesized from L-sorbose by mixed culture of Gluconobacter oxydans and Bacillus megaterium. The interaction between Gluconobacter oxydans and Bacillus megaterium remains unclear and it is a challenge to mathematically model the mixed growth of these two strains. The Monod-type equations were previously proposed to describe the coupled growth of Gluconobacter oxydans and Bacillus megaterium. However, in this study, we modeled the interaction of these two strains in a macroscopic view by introducing the population theory. Taking account of the fact that the density or concentration of Gluconobacter oxydans or Bacillus megaterium was hardly to measure accurately in the mixed culture broth, the data of concentrations of the substrate and product were used to indirectly investigate the relation between these two strains. Three batch experiments were used to validate our model. And according to the values of identified parameters, the type of interaction between Gluconobacter oxydans and Bacillus megaterium was concluded to be predation, where Gluconobacter oxydans was predator, and Bacillus megaterium was prey.     

新装修居室空气中甲醛污染状况的研究

选取 18户新装修居室 ,通过室内连续定期定点采样 ,用变色酸法测定 ,研究了新装修材料影响室内甲醛含量增加的因素 ,根据室内甲醛浓度 -时间动力学曲线 ,提出了合理的搬迁时间。     

Comparative pharmacokinetics of chlorogenic acid after oral administration in rats

The present study was aimed at the comparison of the pharmacokinetics of pure chlorogenic acid and extract of Solanum lyratum Thunb. The animals were allocated to two groups, and were administered chlo...