INDUCTION OF APOPTOSIS OF HUMAN LEUKEMIA CELLS BY α-ANORDRIN

AnordrinisacontraceptiveagentwhichwasfirstdevelopedinChina.Previousstudyshowedthataisomerofanordrin(ANO)exhibitedantitumoreffectbothinvilroandinvivo.l'2Itwasalsofoundthatatsmalldoses,ANQcouldinducedifferentiationofhumanpromyelocyticleukemia.HL-60cells.3However,themechanismofitsaniitumoractivitywasstillnuclear.Inthiswork,wefurtherinvestigatedthetumor-inhibitoryeffectofANOtoexplorethepossiblemechanismsofitsaction.MATERIALSANDMETHODSDrugANOwasproducedbyShanghaiNo.19PharmaceuticalF…     

高效液相色谱法测定地黄中腺苷含量

目的:建立地黄中腺苷含量的测定方法,测定不同品种地黄中腺苷的含量。方法:采用高效液相色谱法测定地黄中腺苷含量。以KYWG-C₁₈为固定相,6%乙腈为流动相,检测波长为260nm。结果:腺苷在0.002mg/ml～0.01mg/ml线性良好。回归方程为Y=1.7742×10-4+8.9021×10-7X,r=0.9995。平均回收率为94.1%。RSD=1.86%(n=5)。结论:本法简便、快速、结果可靠。     

X-radiation induces 8-hydroxy-2'-deoxyguanosine formation in vivo in rat mammary gland DNA

Ionizing radiation is a carcinogen that induces oxidative DNA damage. 8- Hydroxy-2'-deoxyguanosine (8-OHdG) is a relatively abundant, mutagenic lesion that is widely regarded as a reliable index of oxidative DNA damage. The purpose of this study was to examine the effects of X- radiation on levels of 8-OHdG in the context of an experimental model for breast cancer in which chronic radiation exposure has been shown to be carcinogenic in Sprague-Dawley rats. A secondary objective of this study was to determine if the use of phenol during DNA isolation affected the concentration of 8-OHdG subsequently measured. Our results indicate that a profoundly carcinogenic dose of radiation induced a small but significant increase in 8-OHdG concentration in mammary gland DNA, and that the use of a phenol-based versus a salt-based method of DNA isolation had no significant impact on the levels of 8-OHdG detected in either control or irradiated tissue.      

Effects of dietary fat and a vegetable-fruit mixture on the development of intestinal neoplasia in the ApcMin mouse

The variation in colorectal cancer (CRC) incidence worldwide strongly suggests a role for dietary influences. Based on epidemiological data, protective effects of vegetables and fruit intake on CRC are widely claimed, while other data indicate a possible increased CRC risk from (higher) dietary fat intake. Therefore, we have investigated single and interactive effects of dietary fat and a vegetable-fruit mixture (VFM) in the ApcMin mouse, a mouse model for multiple intestinal neoplasia. In this study, four different diets (A-D) were compared, which were either low in fat (20% energy diets A/B) or high in fat (40% energy diets C/D). In addition, 19.5% (wt/wt) of the carbohydrates in diets B and D were replaced by a freeze-dried VFM. The diets were balanced so that they only differed among each other in fat/carbohydrate content and the presence of specific plant-constituents. Because the initiation of intestinal tumors in ApcMin mice occurs relatively early in life, exposure to the diets was started in utero. Without the addition of VFM, mice maintained at a high-fat diet did not develop significantly higher numbers of small or large intestinal adenomas than mice maintained at a low-fat diet. VFM added to a low-fat diet significantly lowered multiplicity of small intestinal polyps (from 16.2 to 10.2/mouse, 15 animals/group), but not of colon tumors in male ApcMin mice only. Strikingly, addition of VFM to female mice maintained on a low-fat diet and to both sexes maintained on a high-fat diet significantly enhanced intestinal polyp multiplicity (from 16.5 to 26.7 polyps/mouse). In conclusion, our results indicate that neither a lower fat intake nor consumption of VFM included in a high-fat diet decreases the development of polyps in mice genetically predisposed to intestinal tumor development.      

维甲类化合物Ro13-7410对HL-60细胞的作用

目的：探讨合成的第三代维甲类化合物（Ｅ）４［２５，６，７，８ｔｅｔｒａｈｙｄｒｏ５，５，８，８ｔｅｔｒａｍｅｔｈｙｌ２ｎａｐｈｔｈａｌｅｎｙｌ１ｐｒｏｐｅｎｙｌ］ｂｅｎｚｏｉｃａｃｉｄ（Ｒｏｌ３７４１０）对白血病细胞ＨＬ６０的影响。方法：采用ＮＢＴ还原能力测定检测细胞分化，电镜和程序性细胞死亡检测试剂盒（ＰＣＤａｓａｙｋｉｔ）鉴别凋亡细胞，Ｆｕｒａ２／ＡＭ荧光法测定胞浆内Ｃａ２＋浓度，ＰＣＲＥＬＩＳＡ试剂盒检测端粒酶活性，流式细胞术测定细胞周期分布。结果：Ｒｏｌ３７４１０诱导ＨＬ６０细胞分化的同时伴随细胞凋亡的发生。在ＨＬ６０细胞凋亡和分化的过程中胞浆内Ｃａ２＋浓度增高，端粒酶活性明显受抑，多数细胞被阻止在Ｇ２／Ｍ期。结论：Ｒｏｌ３７４１０可诱导ＨＬ６０细胞凋亡和分化的同时发生。胞浆内Ｃａ２＋浓度的增高，端粒酶活性的降低以及细胞周期的阻止与细胞凋亡和分化的诱导有关     

鲜蛋的品质安全与控制

本文作者根据我国鲜蛋生产的实际,提出鲜蛋品质安全控制措施防止食源性疾病发生,以确保鲜蛋的食品卫生与安全。     

VEGF、MMP-2、MMP-9在卵巢原发性与转移性癌中表达的研究

目的 :探讨VEGF、MMP 2、MMP 9在卵巢原发上皮癌、库肯勃氏瘤中的表达差异及临床病理意义。方法 :采用免疫组化S P染色技术对 83例卵巢癌 (卵巢原发癌 4 5例、库肯勃氏瘤 38例 )进行分析 ,观察VEGF、MMP 2、MMP 9在卵巢癌中的表达。结果 :VEGF在卵巢原发癌和库肯勃氏瘤组织中的表达显著高于正常卵巢组织 (P <0 .0 5 ) ;MMP 2、MMP 9在正常卵巢组织中表达缺如 ;VEGF、MMP 2、MMP 9在卵巢原发癌与库肯勃氏瘤中表达均有显著差异 (P <0 .0 5 ) ;VEGF、MMP 2、MMP 9在库肯勃氏瘤中及卵巢原发癌中 ,任意两指标阳性表达均有正相关性 (P <0 .0 5 )。结论 :VEGF、MMP 2、MMP 9在库肯勃氏瘤的形成机制中起重要作用 ,与肿瘤的浸润转移密切相关 ,并可为鉴别卵巢原发癌与库肯勃氏瘤提供一定的依据     

盐酸二甲双胍缓释片体外释放度研究

目的对盐酸二甲双胍缓释片体外释放度相关因素进行研究。方法对溶出介质、转速、测定波长及辅料等因素进行考察,确定盐酸二甲双胍缓释片体外释放度的测定方法,对测定方法进行回收试验,并对三批样品及参比制剂进行测定。结果采用转篮法,以1000ml水为溶出介质,转速为100rpm/min,采用UV法,测定波长为233nm,将溶出液稀释至1～12.5μg/ml进行测定。结论本释放度方法简单,快速,可用于盐酸二甲双胍缓释片体外释放度测定。     

重组结核分枝杆菌特异性分泌抗原融合蛋白的活性鉴定及初步应用

目的：融合表达结核分枝杆菌分泌蛋白CFP10-ESAT-6或ESAT-6-CFP10，研究其免疫学特性，为结核病的血清学诊断提供物质基础。方法：将一个柔性的氨基酸“接头”插入原核表达载体pET32c（＋）中，构建pET32c（＋）-linker。PCR法扩增CFP10、ESAT-6基因。将CFP10克隆入改建的载体pET32e（＋）的linker前，ESAT-6克隆入linker后，构建CFP10-ESAT-6融合基因；或将ESAT-6克隆入改建的载体pET32c（＋）的linker前，CFP10克隆入linker后，构建ESAT-6-CFP10融合基因，分别转化大肠杆菌XL1-blue，抽提质粒，酶切鉴定；在大肠杆菌B121中表达，通过Western blot分析其抗原性。结果：两个目的基因分别被按顺序成功克隆入载体pET32c（＋）的linker前或后。重组质粒pET32c（＋）-CFP10-ESAT-6或pET32c（＋）-ESAT-6-CFP10靶基因的测序结果与预计序列完全一致。融合蛋白在B121菌中高效表达。Western blot分析表明，融合蛋白与活动性肺结核患者血清能发生特异性免疫反应。结论：成功地构建了多抗原基因DNA质粒；pET32e（＋）-CFP10-ESAT-6或pET32c（＋）-ESAT-6-CFP10质粒在B121菌中能高效表达rCFP10-ESAT-6或rESAT-6-CFP10融合蛋白，该蛋白兼具CFP10和ESAT-6两种蛋白的抗原性。本研究为rCFP10-ESAT-6或rESAT-6-CFP10融合蛋白在结核病血清学诊断中应用奠定了基础。     

传代培养角膜细胞的染色体遗传变异率分析

目的 分析传代培养角膜细胞染色体数目的变异率.方法 选择人角膜上皮细胞(HCE)、牛角膜内皮细胞(BCE)和兔角膜上皮细胞(RCE)细胞,采用直接法制备传代细胞染色体标本,常规Giemsa染色,1 000倍光学显微镜下计数分裂相染色体数目,进行核型分析,统计染色体数目变异情况.结果 HCE染色体众数为56 ～ 65,为超二倍体;BCE染色体众数为27 ～ 34,为亚二倍体;RCE染色体众数为74 ～ 88,为超二倍体.与起源细胞相比,以上3种传代细胞染色体数目均发生了改变.结论 该项核型分析为HCE、BCE和RCE 的功能研究提供了重要的参考信息.