Changes of interleukin-1 β, tumor necrosis factor α and interleukin-6 in brain and plasma after brain injury in rats

Objective: To study the changes of interleukin-1 β(IL-1β), tumor necrosis factor α (TNFα) and interleukin-6 (IL-6) levels in brain and plasma after brain injury and to assess the relationship between the cytokine levels and injury severity in rats. Methods. A total of 51 male Wistar rats, weighing 280-340g, were anesthetized with chloral hydrate(400 mg/kg body weight) through intraperitoneal injection and fixed on a stereotaxic instrument. Severe brain injury was created in 16 rats (severe injury group) and moderate brain injury in 18 rats (moderate injury group) by a fluid percussion model, and cytokine levels of IL-1β, TNFα and IL-6 were measured with biological assay. And sham operation was made on the other 17 rats (control group). Results: In the control group, the levels of IL-1β,TNFα and IL-6 were hardly detected in the cortex of the rats, but in the ipsilateral cortex of the rats in both injury groups, they increased obviously at 8 hours after injury.The increasing degree of these cytokines had no significant difference between the two injury groups. The levels of IL-6 in the plasma of all the rats increased slightly, whereas the levels of IL-1β and TNFα were undetectable. Conc|usions: The increase of IL-1β, TNFα and IL-6 levels is closely related to brain injury. The increased cytokine levels in the central nervous system are not parallel to those in the peripheral blood. It suggests that inflammatory cytokines play important roles in the secondary neural damage after brain injury.     

大鼠脑创伤后IL—1β,TNFα,IL—6水平的变化

目的研究实验性脑创伤后体内白细胞介素１β（ＩＬ－１β）、肿瘤坏死因子α（ＴＮＦα）、白细胞介素６（ＩＬ－６）三种炎性细胞因子水平的变化。方法利用液压脑创伤装置造成大鼠脑挫伤，利用生物活性法检测脑组织及血浆中细胞因子的含量。结果脑创伤后脑组织中上述三种因子水平有明显增高，外周血中上述因子水平较对照组无明显变化；不同程度脑创伤组间上述三种因子水平无统计学差异。结论ＩＬ－１β、ＴＮＦα、ＩＬ－６三种炎性细胞因子与脑创伤关系密切，其水平变化主要表现在脑组织中     

雷公藤中具有抗癌活性的二萜类化合物

目的研究雷公藤的化学成分及其细胞毒活性。方法用硅胶柱色谱、凝胶柱色谱分离,制备高效液相色谱纯化,得到单体化合物,用各种有机波谱鉴定化合物结构;以MTT法测试各化合物的抗癌活性。结果分离得到5个萜类化合物,鉴定为雷酚萜L(3-epi-triptobenzeneB,Ⅰ)、雷酚萜B(3β,14-dihydroxy-abieta-8,11,13-triene,triptobenzeneB,Ⅱ)、雷酚萜E(wilforolE,Ⅲ)、雷酚萜酸(triptohairicacid,Ⅳ)、雷酚萜酸甲醚[11-hydroxy-14-methoxy-18(4→3)-abeo-abietan-3,8,11,13-tetraen-18-oic-acid,hypoglicacid,Ⅴ]。结论化合物Ⅰ为新化合物,命名为雷酚萜L(triptobenzeneL),化合物Ⅳ为首次分离得到。细胞毒实验表明各化合物均有一定的抗癌活性。     

柴胡愈伤组织生长和不定根诱导的研究

目的探讨柴胡愈伤组织生长和其不定根诱导的适宜培养条件。方法以无菌苗为外植体诱导获得愈伤组织后,对不同种类和不同质量浓度的生长素进行实验,并对光和温度对柴胡愈伤组织生长和其不定根诱导的影响进行了研究。结果柴胡的愈伤组织适宜于在MS NAA4mg/L KT0.2mg/L培养基或MS NAA2mg/L KT0.2mg/L培养基上继代培养。诱导其不定根时宜采用的培养基为MS IBA2mg/L KT0.2mg/L。25℃条件下,黑暗培养既有利于柴胡愈伤组织的生长又有利于其不定根的诱导。结论比较适宜于柴胡愈伤组织生长的生长素为NAA,而有利于不定根诱导的生长素为IBA。温度对愈伤组织的生长影响非常明显,光照是其发根的限制因素。     

蛇莓中具有抗癌活性的三萜类成分

蛇莓作为一种传统中药,是蔷薇科植物蛇莓Duchesnea indica(Andr.)Focke的全草,始载于《别录》,别名蛇泡草、蛇葡萄等[1]。蛇莓味甘、苦,性寒,具有清热解毒、凉血止血、散瘀止痛之功效。民间主要用于治疗热病、惊痫、咽痛、疖肿、烫火伤等[2]。文献报道从蛇莓中分离得到的化合物主要有三萜及其苷类、香豆素类、黄酮类、甾醇类等[3,4],现代药理研究表明蛇莓具有较强的抗癌活性[5,6]。笔者对蛇莓提取物的前期实验表明,其石油醚提取物和醋酸乙酯提取物对宫颈癌HeLa细胞具有较强的细胞毒活性,见表1。在进一步的化学成分研究中,从石油醚和醋酸乙…     

高血压脑出血患者肿瘤坏死因子-α和白细胞介素-6活性水平的观察

高血压脑出血患者肿瘤坏死因子α和白细胞介素６活性水平的观察张淑姚智邢复明芦奕曾宪起张毅勾俊龙华勇本研究系天津市卫生局重点科研基金资助项目，并曾在脑血管疾病研究进展国际交流会上交流作者单位：３００２５０天津天津市第三医院老年医学研究所神经外科（张淑?..     

大鼠脑创伤后白细胞介素-1β和肿瘤坏死因子-αmRNA在脑组织中的表达

目的：研究大鼠实验性脑创伤后脑组织中白细胞介素１β（ＩＬ１β）及肿瘤坏死因子α（ＴＮＦα）ｍＲＮＡ表达水平的变化。方法：由液压型创伤装置致大鼠一侧脑挫伤，利用地高辛标记的寡核苷酸探针原位杂交技术观测ＩＬ１β和ＴＮＦα的基因表达。结果：鼠脑创伤后上述两种细胞因子的基因表达水平迅速增高，在伤后１小时即可达到最高水平，并持续至伤后６小时，伤后２４小时后基本恢复至正常水平。两种细胞因子在脑组织中的表达区域很类似，主要出现于创伤侧及对侧脑皮质、海马、胼胝体、脉络丛等部位。结论：脑创伤后炎性细胞因子主要由中枢神经系统内部产生，ＩＬ１β及ＴＮＦα可能对脑创伤后继发性神经损害有直接的作用     

兔肺动脉内皮细胞DNA损伤检测方法的建立及初步应用

[目的]建立兔肺动脉内皮细胞单细胞电泳方法检测DNA的损伤并初步观察肺心病患者血清对兔肺动脉内皮细胞DNA的损伤作用。[方法]用胶原酶Ⅰ消化分离获得兔肺动脉内皮细胞(RPAECs)，将血管内皮细胞与含不同浓度肺心病患者和正常人血清的培养基共同孵育12h，收集细胞利用溶解液破坏细胞膜，再用高盐溶液将细胞DNA解链，然后对其进行琼脂糖凝胶电泳(AGE)。电泳后经溴乙啶染色并在荧光显微镜下观察彗星样的电泳形状，判断细胞DNA的损伤程度。[结果]高浓度的肺心病患者血清作用后的内皮细胞，可见彗星样电泳形状。[结论]高浓度肺心病患者血清对兔肺动脉内皮细胞的DNA有损伤。     

聚酰胺-氨纳米微粒介导5-氟尿嘧啶联合小RNA-21抑制乳腺癌细胞生长的研究

Objective To study the effect of PAMAM-mediated 5-fluorouracil combined with miR-21 inhibitor gene therapy to suppress MCF-7 human breast cancer cell growth in vitro. Methods 5-Fu/PAMAM complex was prepared by dialysis method and then incubated with miR-21 inhibitor at room temperature. Transmission electronic microscopy (TEM) was performed to observe the morphology of the nanoparticles. The drug loading efficiency and encapsulation efficiency was determined by ultraviolet spectroscopy (UV). The transfection of PAMAM dendrimer was detected by flow cytometry. MTT assay was carried out to determine MCF-7 cell growth survival rate. Cell apoptosis was analyzed by flow-cytometry. Transwell assay was performed to detect invasion ability after MCF-7 cells treated with 5-Fu chemotherapy combined with miR-21 inhibitor gene therapy. Results The morphology of the complex was sphere observed under TEM. Encapsulation efficiency and loading efficiency of drug were (66. 21±4. 11)% and (31.77±0. 73)% , respectively. Flow cytometry revealed that 5-Fu/PAMAM transfection efficiency was (60.54 ±6. 97)%. 5-Fu combined with miR-21 inhibitor treatment significantly suppressed cell growth, and the survival rate was only (55. 85±3. 71)% on the 6th day of the observation period. The apoptosis rate in combined treatment group was (18. 32±2.42)% , dramatically higher than in control group (F=58. 326,P<0. 01). In combined treatment group, the number of invasion cells was only 18. 96 ±3. 14, suggesting the greatly decreased invasion ability of MCF-7 cells (F=16. 409,P < 0. 01). Conclusion PAMAM could effectively deliver miR-21 inhibitor and 5-Fu simultaneously, and combined therapy can suppress growth of MCF-7 cells effectively in vitro.     

肝移植术后巨细胞病毒感染受者外周血单个核细胞细胞因子mRNA表达的变化

巨细胞病毒(CMV)感染是器官移植术后的一种常见并发症,大部分病例发生在术后3个月之内.CMV感染宿主后,有多种细胞因子参与其发病.Th细胞是重要的T淋巴细胞亚群,能分泌多种细胞因子,调节和增强机体的免疫应答,与CMV感染的急性反应、播散、活化及逃避宿主的免疫清除等致病性密切相关.研究肝移植术后CMV感染受者外周血Th细胞因子,探讨其与CMV感染的关系.