EGF对用或未用MNNG诱导的日本血吸虫成虫培养细胞生长的影响

目的研究表皮生长因子(E GF)对用或未用甲基硝基亚硝基胍(MNNG)诱导的日本血吸虫成虫培养细胞的促生长、增殖作用.方法将联合法接种培养至第3天的日本血吸虫成虫培养细胞,一部分在含EGF终浓度分别为0、0.5、1、2、4、8、12、16、20、 24、28 ng/ml的附加20%小牛血清及常量抗菌素的RPMI-1640培养基中培养 ;另一部分,先用含MNNG终浓度为3 μg/ml附加20%小牛血清和常量抗生素的RP MI-1640培养基处理48h,再换用含终浓度分别为0、1、8、12、16、20 ng /ml的EGF培养基继续培养.每日用Olympus IM倒置显微镜观察细胞生长和增殖情况.结果两实验组中,用不同浓度EGF处理后的日本血吸虫成虫培养细胞均在2周以后出现不同程度的脱落、退化;并且,随着EGF浓度的升高, 培养细胞脱落、退化的现象更加严重;两实验组相比,未用MNNG诱导的培养细胞出现脱落和退化现象的时间比用MNNG诱导的相对更早.结论外加EGF对用或未用MNNG诱导的日本血吸虫成虫培养细胞的生长增殖均无促进作用,相反,加速了培养细胞的老化,尤其是对未用MN NG诱导的日本血吸虫成虫培养细胞,这种作用更加明显.     

EGF对用或未用MNNG诱导的日本血吸虫成虫培养细胞生长？…

目的 研究表皮生长因子（ＥＧＦ）对用或未用甲基硝基亚硝基胍（ＭＮＮＧ）诱导的日本血吸虫成虫培养细胞的促生长、增殖作用。方法 将联合法接种培养至第３天的日本血吸虫成虫培养细胞，一部分在含ＥＧＦ终浓度分别为０、０．５、１、２、４、８、１２、１６、２０、２４、２８ｎｇ／ｍｌ的附加２０％小牛血清及常量抗菌素的ＲＰＭＩ－１６４０培养基中培养；另一部分，先用含ＭＮＮＧ终浓度为３μｇ／ｍｌ附加２０％小牛血清和常     

日本血吸虫成虫培养细胞骨架系统的研究

目的：研究日本血吸虫成虫培养细胞的骨架系统。方法：将日本血吸虫成虫细胞接种于小盖玻片上,以RPMI－1640含20％小牛血清附加常量抗菌素的培养基培养,用考马斯亮蓝染色法和魁笔环肽荧光染色法显示培养细胞骨架。结果：考马斯亮蓝染色显示日本血吸虫成虫细胞骨架呈网络状结构,均钭分布于胞质中;用（NH4）2SO4抽提后考马斯亮蓝色显示细胞骨架无明显改变;鬼笔环肽荧光染色后可见细胞内有均匀荧光亮点。结论：日本血吸虫成虫培养细胞骨架呈致密网络状结构,以中间纤维为主,缺乏粗大的微丝束。     

甲基硝基亚硝基胍对日本血吸虫成虫培养细胞骨架作用的研究

目的 通过观察N－甲基－N－硝基－N－亚硝基胍（MNNG）诱导日本血吸虫培养细胞后骨架的改变,研究MNNG对培养细胞转化、增殖的作用。方法 将日本血吸虫成虫培养细胞接种于小盖玻片上,培养1周时用浓度为3mg/L的MNNG处理48h,然后用RPMI－1640含20％小牛血清附加常量抗菌素的培养基培养2周,再换用RPMI－1640含5％小牛血清的培养基继续培养,用考马斯亮兰染色法和鬼笔环肽荧光染色法显示培养细胞骨架。结果 MNNG诱导后,在培养第4、5周时部分培养细胞骨架排列紊乱,微丝集聚于细胞边缘。结论 MNNG有一定诱导日本血吸虫成虫培养细胞转化、促进其分裂的作用。     

甲基硝基亚硝基胍对日本血吸虫成虫培养细胞磷酸酶影响的研究

目的 研究甲基硝基亚硝基胍（MNNG）对日本血吸虫成虫培养细胞碱性磷酸酶（AKP）和酸性磷酸酶（ACP）活性的影响。方法 将虫龄26d的日本血吸虫成虫细胞接种于小盖玻片上，在RPMI－1640含20％小牛血清附加常量抗生素的常规培养基中培养第7天时，随机分为实验组和对照组，实验组用含浓度为3μg/mlMNNG的常规培养基处理48h，对照组用不含MNNG的常规培养基处理同样时间，随后换用常规培养基培养3周，当再换用含5％小牛血清的培养基培养1周时，分别用Gomori钙钴法和Gomori硫化铅法对两组培养细胞进行AKP和ACP细胞化学染色，用实验组培养细胞的AKP、ACP活性明显高于对照组培养细胞的活性（P＜0．01）。结论 MNNG能增强日本血吸虫成虫培养细胞AKP、APC的活力，对培养细胞有促生长或／或诱导其转化的作用。     

日本血吸虫成虫培养细胞SDH和LDH细胞化学研究

目的　研究日本血吸虫成虫培养细胞琥珀酸脱氢酶 (SDH)和乳酸脱氢酶 (LDH)含量、分布及变化规律 ,了解日本血吸虫成虫培养细胞的能量代谢类型。方法　将虫龄 2 6d的日本血吸虫成虫细胞接种于小盖玻片上 ,培养于RPMI- 16 4 0含2 0 %小牛血清附加常量抗生素的培养基中 ,定时运用Pearson法进行SDH和LDH染色 ,用Olympus-BH2 显微镜观察并拍照 ,用HPIAS - 2 0 0 0图像分析仪测量其含量 ,并作统计分析。结果　日本血吸虫成虫培养细胞均具有SDH和LDH活性 ,两者均分布在细胞质内。培养 1d细胞的SDH和LDH活性最强 ,随着培养时间延长 ,其活性逐渐减弱 ,其中SDH活性下降较快 ,培养 5d大部分细胞SDH活性已极弱 ;而LDH活性下降则较缓 ,培养 5 6d细胞仍具LDH活性。结论　体外培养的日本血吸虫成虫细胞的能量代谢类型与成虫相似 ,既存在三羧酸循环需氧型呼吸链 ,也具有无氧糖酵解 ,但以无氧糖酵解为主。     

MNNG对日本血吸虫成虫细胞鸟氨酸脱羧酶活性作用的初步研究

目的　观察 N-甲基 - N-硝基 - N-亚硝基胍 MNNG)诱导后日本血吸虫成虫细胞鸟氨酸脱羧酶 ODC)活性的变化。　方法　将日本血吸虫成虫剪碎后 ,收集成虫细胞 ,培养 1wk后依次用 3μg/ ml的 MNNG处理 4 8h,用 RP-MI- 16 4 0加 10 %小牛血清及常量抗生素的培养基清洗数次并继续培养。对照组不用 MNNG处理。分光光度法测定ODC活性。　结果　 MNNG诱导后第 2、3周 ODC活性显著增高。　结论　日本血吸虫成虫细胞内存在 ODC活性 ,MNNG具有增强 ODC活性的作用     

钙通道阻滞剂与肌动蛋白解聚/稳定剂对吡喹酮体外杀日本血吸虫作用的效应影响

目的探索吡喹酮（praziquantel,PZQ）对日本血吸虫的药物靶点及作用机制。方法在日本血吸虫单性尾蚴感染昆明小鼠6 w后,采用灌注法经鼠肝门静脉收集日本血吸虫雄性成虫。在DMEM（Dulbecco-modified Minimum EagleMedium）培养液内,将雄性成虫分别与能干扰细胞钙通道功能的各种药理学成分（钙通道阻滞剂及肌动蛋白解聚剂或稳定剂）孵育1h,然后在培养液内加入临界致死剂量的PZQ（14μmol/L）与虫体孵育过夜（16h）。次,无菌生理盐水洗涤虫体3次,更换无药物的新鲜培养液继续培养虫体5d,每天置于体视显微镜下观察并记录。结果d晨上午正常情况下,14μmol/L的PZQ药物体外实验可以杀死大部分日本血吸虫雄性成虫,而与肌动蛋白解聚剂细胞松弛素D（cytochalasin D,CyD）预孵育1h的虫体,能够完全拮抗14μmol/L浓度PZQ的杀虫效应,虫体100%存活;与钙通道阻滞剂（calciumchannel blockers,CCBs）尼群地平和尼非地平预孵育1h的虫体,部分拮抗14μmol/L浓度PZQ的杀虫效应,大约50%虫体存活。结论PZQ作用血吸虫的药物靶点可能与血吸虫的钙通道有关。     

MNNG诱导日本血吸虫成虫培养细胞的扫描电镜观察

目的　观察甲基硝基亚硝基胍 (MNNG)对不同培养时间日本血吸虫成虫培养细胞作用的变化 ,确定培养细胞发生转化进而增殖的最佳诱导时间。　方法　将 2 3～ 2 8d虫龄的日本血吸虫成虫制成细胞悬液 ,接种于小盖玻片上 ,培养于含 2 0 %小牛血清及常量抗生素的RPMI 164 0常规培养基中。将接种培养第 4、5、6、7、8d的细胞分别设为 5个实验组及其相应的对照组。实验组用含终浓度为 3 μg/mlMNNG的常规培养基处理 48h ,对照组用不含MNNG的常规培养基处理相同时间 ,嗣后换用常规培养基培养 4周 ,再改用含 5 %小牛血清的培养基继续培养。MNNG诱导后每周取各组培养细胞固定、制样 ,每组随机取 3张小盖玻片进行电镜扫描观察 ,连续取样 11周。　结果　经MNNG诱导的日本血吸虫成虫培养细胞表面出现形态各异的结构 ,既有与对照组类似的表面较光滑和有乳突的培养细胞 ,也有表面光滑如玻璃珠状的细胞 ,还有具长纤突、微嵴、皱褶、微绒毛、蜂窝和仙人球状等形态的细胞 ;实验 1组培养至第 5周即出现大量分裂细胞。　结论　MNNG诱导培养第 4d的日本血吸虫成虫细胞培养至第 5周可发生转化而出现分裂、增殖。     

正交试验法筛选日本血吸虫细胞的培养条件

目的　筛选日本血吸虫成虫细胞的培养条件及评价细胞培养条件优劣的指标。方法　以琥珀酸脱氢酶(SDH)、乳酸脱氢酶(L DH)和葡萄糖- 6 -磷酸脱氢酶(G- 6 - PDH )为指标,运用正交试验法进一步研究合成培养基、细胞外基质和血清浓度3个因素在3个不同水平对虫龄为2 1d的日本血吸虫细胞的影响。培养第5天对日本血吸虫培养细胞进行SDH染色;培养第14天分别进行L DH、G- 6 - PDH染色,Olympus- BH2 显微镜观察并拍照,HPIAS- 2 0 0 0图像分析仪测量其含量,用SPSS10 .0作统计分析。结果　不论以SDH或L DH,还是G- 6 - PDH为指标,均显示RPMI- 16 4 0含2 0 %小牛血清组成的培养基培养接种于肝基质上的日本血吸虫细胞,培养细胞的SDH、L DH、G- 6 -PDH活性最强。血清浓度对培养细胞酶活性的影响最大,其次是细胞外基质(ECM) ,影响最小的是合成培养基。其中,血清浓度对3种酶活性的影响差异均显著;基质对SDH、L DH活性的影响差异显著,而对G- 6 - PDH活性的影响差异不显著;合成培养基的影响均无差异。结论　RPMI- 16 4 0含2 0 %小牛血清组成的培养基培养接种于肝基质上的日本血吸虫细胞,培养细胞的SDH、L DH、G- 6 -PDH活性最强。选择3种酶中任一,均可用来评价日本血吸虫细胞培养条件的优劣。     

Use of urine samples from healthy humans, nephritis patients or other animals as an alternative to foetal calf serum in the culture of Leishmania (L.) donovani in vitro

The effect of supplementing in-vitro cultures of Leishmania donovani with urine was investigated. The parasites were isolated from Bangladeshi patients with visceral leishmaniasis. The urine samples used were collected from healthy human donors, patients with nephrotic syndrome, diabetic nephritis (DN) or diabetes mellitus, a dog and a cow. Promastigotes from blood-agar cultures were inoculated into RPMI-1640 basal medium with 10% heat-inactivated foetal calf serum (FCS) and/or 1%-20% urine. The parasites were then counted in a haemocytometer, on days 2, 4, 5, 6, 7, 8, 10, 12 and 14 post-inoculation. From day 4, the numbers of parasites/ml in cultures containing 5% healthy-human urine but no FCS were at least as high as those in cultures containing 10% FCS but no urine (P = 0.191). The wet weights of parasites harvested from mass cultures of the parasites in RPMI-1640 plus 5% healthy-human urine and in RPMI-1640 plus 10% FCS were practically the same. Multiplication of the parasites in the presence of 5% urine from a DN patient was significantly greater (P < 0.01) than that seen with other urine samples at the same concentration or with 10% FCS. The multiplication seen with 8% canine urine was almost the same as with 5% healthy-human urine. Parasites could be maintained in RPMI-1640 plus 5% healthy-human urine for at least 40 days, sub-culturing every 4 days. Urine may be a better and much cheaper stimulant of Leishmania multiplication in vitro than FCS.     

班氏丝虫和马来丝虫感染期幼虫体外培养的进一步研究

在4种培养系统中,马来丝虫Ⅲ期幼虫在改良RPMI1640、20%小牛血清和人胚肾细胞系为饲养层的培养系统中生长发育良好,可以从Ⅲ期幼虫蜕皮2次发育到童虫,最长存活时间为54d。在单纯改良RPMI1640、TC199和20％小牛血清中培养,从Ⅲ期幼虫发育到童虫的最长存活时间为42d。班氏丝虫Ⅲ期幼虫在上述2种培养系统中,分别存活57和36d,从Ⅲ期幼虫蜕皮进入Ⅳ期幼虫和童虫。对马来丝虫幼虫体外培养蜕皮时间、虫体大小与沙鼠体内发育情况进行了比较。     

Long-term culture of canine bone marrow cells

Conditions that allow the growth of canine marrow cells in long-term marrow culture are described. The quality of the culture conditions was evaluated based on the weekly number of granulocyte-macrophage colony-forming units (CFU-GM) in the nonadherent cell fraction. Using this parameter, the highest number of CFU-GM was obtained when marrow cells were incubated at 37 degrees C in RPMI-1640 or McCoy's 5A medium supplemented with 20% prescreened horse serum without addition of hydrocortisone. CFU-GM colonies could be regularly grown out of the nonadherent cell fraction for 20-31 weeks, after recharging the cultures with 1.5 X 10(7) mononuclear autologous marrow cells 1 week after establishing the stromal cell layer.     

Primary culture of porcine pancreatic acinar cells

INTRODUCTION: The methodology of acinar cell culture has become of primary importance in the research of pancreatic physiology and pharmacology. AIM: To develop a method for primary culture of porcine pancreatic acinar cells. METHODOLOGY: Dispersed pancreatic acinar cells were made by RPMI-1640 medium containing collagenase III. After purification, the isolated acinar cells were cultured in RPMI-1640 medium with 2.5% fetal bovine serum. The morphologic characteristics of acinar cells were described. (3)H-thymidine incorporation of acinar cells and activity of amylase or lipase were determined during the culture. RESULTS: There were no remarkable morphologic changes in the pancreatic acinar cells during the 20-day culture. The acini showed the tendency of gathering but did not attach to the walls of the culture disks. Incorporation of (3)H-thymidine in acinar cells in the primary culture was well kept. The secretion of amylase or lipase from acini decreased with the time of culture. CONCLUSIONS: In the primary culture of acinar cells from porcine pancreas developed in this study, the acinar cells retained normal morphology and ability of growth but not secretion of amylase or lipase. The method would be beneficial for further experiments on acini of porcine pancreas.     

The production of differentiation autoinducing activity by WEHI-3B D+ leukemia cells

We studied the differentiation autoinducing activity in WEHI-3B D+ cell-conditioned medium (WCM). After culturing 10(6)/ml WEHI-3B D+ cells in RPMI-1640 medium without fetal calf serum (FCS) for 4 days, the supernatant was collected. The medium, concentrated 50-fold by YM-5 membrane filtration, was fractionated by gel exclusion on Ultrogel AcA44. We evaluated the effect of each of the four fractions on differentiation in WEHI-3B D+ cells by morphological, functional, and cytochemical criteria after adding the fractions to liquid or soft-agar cultures of 10(3) cells in 1 ml RPMI-1640 medium containing 10% FCS; the experimental cultures contained 10% of the fractions, with a control for each without the fraction. The growth of WEHI-3B D- cells in culture was inhibited by the addition of fraction P only (mol. wt. 10,000-20,000 daltons). In these same cultures, the cells were granulocyte-like, strongly positive for naphthol ASD chloroacetate esterase, and had phagocytic activity. Colonies grown in agar culture with fraction P also exhibited a peripheral halo of loosely dispersed cells around a central aggregate. Fraction P contained neither granulocyte colony-stimulating activity nor burst-promoting activity. These results suggest that fraction P contains differentiation autoinducing factor that is different from granulocyte colony-stimulating factor or interleukin 3.     

Establishment of a monosomy 7 leukemia cell line, MONO-7, with a ras gene mutation

A monosomy 7 leukemia cell line, designated MONO-7, was established from the peripheral blood of a patient with monosomy 7 acute myelocytic leukemia (French-American-British classification M0). The cells were cultured continuously for more than 24 months in RPMI-1640 medium supplemented with 10% heat-inactivated fetal calf serum. The cell line exhibits an unclassified appearance. Cytochemically, alpha-naphthol-acetate esterase and myeloperoxidase are negative. Immunophenotypically, the cell line expresses CD33, CD13, CD56, CD34, CD38, HLA-DR, and CD45, but lacks T and B cell-associated antigens. Karyotypic analysis of the cell line showed only 45,XY,-7. Analysis of the N-ras gene mutation demonstrated identical mutations in fresh leukemic cells and the MONO-7 cell line. Clonal rearrangements of the immunoglobulin heavy-chain gene, T-cell receptor beta-chain gene, or T-cell receptor gamma-chain gene were not found in DNA extracted from MONO-7 cells. The growth of MONO-7 cells in vitro was stimulated by recombinant human granulocyte-macrophage colony-stimulating factor or interleukin 3. To our knowledge, this is the first report of the establishment of a cell line with the karyotype 45,XY,-7 without any other abnormality and with a ras gene mutation.     

Growth study of a nonpathogenic strain of Leishmania donovani with different nutrients

The studies on growth pattern of a nonpathogenic Leishmania donovani, strain UR6, in different media showed that it can be regularly cultivated amd maintained in modified Ray's Medium (Agar) and three other liquid media, namely DME Medium, Medium 199 and RPMI-1640 which are manufactured in India. The well known N.N.N. Medium provided quantitatively poorer growth in comparison to these medium. Measurement of L. donovani cell concentration by optical density in a spectrophotometer has been worked out for expressing immunochemical observations on antigens in terms of cells per mililitre.     

Response of anterior pituitary cells to culture media

We examined the ability of four commonly used culture media to support prolactin (PRL), growth hormone (GH), and adrenocorticotropic hormone (ACTH) release, as well as the inhibitory PRL response to dopamine. After a week of primary culture, rat anterior pituitary cells from both genders were studied over a 4 hour period. Whereas ACTH secretion was similar across the various media, PRL and GH release were lessened with M199 and F10, respectively. Dopamine inhibited PRL release under all media conditions which was inconsistant with the reported lack of a dopamine effect with RPMI-1640 medium. These data confirm the postulate that media culture conditions can determine the degree of expression of constituitive phenotypes in anterior pituitary cells.     

MTT染色法计数阴道毛滴虫体外增殖密度的试验

目的评价四氮唑蓝(5-’diphenyl tetrazolium bromide,MTT)染色法计数阴道毛滴虫增殖密度的可行性。方法在已接种了阴道毛滴虫的肝浸汤(含小牛血清)、RPMI-1640(含小牛血清)、RPMI-1640(无血清)培养基中加入MTT,与血球计数板法进行比较。结果加入MTT后4、244、8 h,上述3种培养基中大部分阴道毛滴虫虫体内部未见蓝色结晶体形成,有血清的培养液镜下观察视野不清晰。结论MTT法不宜用于计数体外培养阴道毛滴虫的增殖密度。