菊叶总黄酮抗肿瘤作用初步研究

本文以MTT法考察菊叶中总黄酮的体外抗肿瘤活性;以小鼠移植瘤模型测定总黄酮对荷瘤小鼠抑瘤率和腹腔巨噬细胞吞噬能力,研究其体内抗肿瘤活性和免疫调节作用.结果表明,总黄酮对S180细胞生长有显著抑制作用.体内试验表明,与生理盐水组相比,总黄酮对小鼠S180实体瘤有显著抑制作用（P〈0.01）,抑瘤同时可促进体重增长;总黄酮高剂量组可提高荷瘤小鼠的脾指数和胸腺指数.与环磷酰胺组和生理盐水组比较,总黄酮可使荷S180实体瘤小鼠腹腔巨噬细胞吞噬能力升高,表明其对小鼠没有免疫抑制作用.     

鹅绒委陵菜多糖对肿瘤小鼠免疫功能的影响

目的：研究鹅绒委陵菜多糖（PAP）的抗肿瘤作用及其免疫调节作用。方法：用小鼠肝癌（S180）移植肿瘤的动物模型,以肿瘤抑制率、溶血素、NK细胞活性和淋巴细胞增殖率作指标,结果表明,鹅绒委陵菜多糖不仅能显著抑制移植性肿瘤S180的生长,而且还能明显促进荷瘤鼠的体液免疫和提高荷瘤鼠的脾细胞转化功能及增强NK细胞活性,均以200mg。kg-1.d-1效果最佳。结论：鹅绒委陵菜多糖的抗肿瘤作用和其免疫调节作用有明显的相关性,鹅绒委陵菜多糖的抗肿瘤作用可能与激活体内免疫系统有关。     

伤寒杆菌70KD热休克蛋白的抗肿瘤作用

纯化伤寒杆菌HSP70,观察其对小鼠S180肿瘤细胞的抑制作用,对荷瘤小鼠连续皮下注射伤寒杆菌HSP70,每只小鼠每天注射100μ／mL,的伤寒杆菌HSP70．5mL,每天一次．9天后处死小鼠,剥离肿瘤,分别称量实验组与对照组小鼠肿瘤的重量．结果表明,伤寒杆菌HSP70能明显抑制小鼠S180肿瘤细胞在小鼠体内的生长．     

新城疫病毒感染对小鼠肉瘤S180细胞p53蛋白的表达及细胞周期的影响

目的:研究新城疫病毒(NDV)感染对小鼠肉瘤S180细胞p53蛋白的表达及细胞周期的影响。方法:通过NDV体外感染小鼠肉瘤S180细胞,经倒置显微镜观察细胞形态变化,噻唑蓝(MTT)比色法检测小鼠肉瘤S180细胞的增殖状况;经流式细胞仪分析检测NDV体内感染后荷瘤鼠腹水中S180细胞分裂周期各时相的变化、细胞凋亡情况及细胞表面p53蛋白的表达情况。结果:NDV体内、外感染对小鼠肉瘤S180细胞的杀伤作用明显,NDV体内感染后荷瘤鼠腹水中S180细胞高表达p53蛋白,细胞凋亡率增加,G2/S期细胞减少,增殖指数(PI)降低,与阴性对照组比较有显著性差异(P<0.05)。结论:NDV感染可增强小鼠肉瘤S180细胞p53蛋白的表达,影响其细胞周期,诱导其凋亡且有较强的杀瘤作用。     

盐生隐杆藻胞外多糖（EPAH）抗肿瘤作用的实验研究

目的：探讨盐生隐杆藻胞外多糖对小鼠抗肿瘤作用的影响。方法：建立小鼠移植性S180实体瘤模型，观察EPAH对S180荷瘤小鼠的抑瘤作用、对白细胞的数量、对免疫器官及红细胞粘附肿瘤细胞能力的影响；另建立小鼠移植性S180腹水瘤模型，观察EPAH对小鼠存活时间的影响；同时，通过体外培养检测EPAH对SMMC7721细胞增殖的影响。结果：EPAH能明显抑制S180、SMMC7721细胞生长、促进红细胞粘附肿瘤细胞能力、增强免疫力并能有效提升减少的白细胞数量。结论：EPAH能显著增强小鼠抗肿瘤活性。     

喜树果苷类成分体内抗肿瘤作用的初步研究

目的：对喜树果苷类成分提取部位的体内抗肿瘤作用进行初步研究。方法：以荷S180实体瘤小鼠为模型,观察喜树果苷类成分提取部位对肿瘤的抑制率及对小鼠免疫器官重量的影响。结果：喜树果苷类成分提取部位对小鼠肉瘤S180有明显的抑制作用;对小鼠免疫器官重量无明显影响。结论：喜树果苷类成分提取部位具有一定的抗肿瘤活性。     

盐生隐杆藻胞外多糖(EPAH)抗肿瘤作用的实验研究

目的:探讨盐生隐杆藻胞外多糖对小鼠抗肿瘤作用的影响.方法:建立小鼠移植性S180实体瘤模型,观察EPAH对S180荷瘤小鼠的抑瘤作用、对白细胞的数量、对免疫器官及红细胞粘附肿瘤细胞能力的影响;另建立小鼠移植性S180腹水瘤模型,观察EPAH对小鼠存活时间的影响;同时,通过体外培养检测EPAH对SMMC7721细胞增殖的影响.结果:EPAH能明显抑制S180、SMMC7721细胞生长、促进红细胞粘附肿瘤细胞能力、增强免疫力并能有效提升减少的白细胞数量.结论:EPAH能显著增强小鼠抗肿瘤活性.     

反应停对小鼠荷瘤H_(22)的影响

目的研究不同剂量反应停及反应停协同环磷酰胺对小鼠荷瘤H22(肝癌)实体型肿瘤的影响。方法建立小鼠肝癌移植实体型肿瘤模型,比较不同剂量反应停对小鼠肝癌的影响,同时观察反应停协同环磷酰胺对小鼠肝癌的影响。通过研究反应停对小鼠迟发型变态反应的影响探究其免疫作用。结果反应停对小鼠荷瘤H22呈现明显剂量依赖性抑制作用,反应停与环磷酰胺具有协同抗小鼠肝癌作用。反应停对小鼠迟发型变态反应呈剂量依赖性促进作用。结论反应停具有抗肝癌作用,而且与环磷酰胺具有协同抗肿瘤作用,此作用与反应停抗免疫作用有关。     

中草药白英提取物的体外抑菌作用研究

利用平板菌落计数法筛选10^4 cfu／mL的菌液并将其涂布到细菌培养基上,制备药敏纸片,贴到含菌培养基表面,通过测量抑菌圈的大小研究中草药白英提取物对大肠杆菌和金黄色葡萄球菌的抑制效果．结果表明：白英提取物对2种菌均有体外抑制作用,对大肠杆菌的抑制效果好于金黄色葡萄球菌．不同质量浓度药液的抑菌圈直径差异显著．     

海兔卵提取物抗肿瘤抗氧化的药理研究

海兔卵乙醇提取物和水提取物均对小鼠的心、肝、紧具有明显的抗脂质过氧化作用，两种提取物均有抑制肉瘤180的瘤体重量，其中乙醇提取物均增加EAC腹水瘤小鼠的存活率、延长小鼠的生命，且乙醇提取物高剂量组的作用有显著性差异．     

Antitumor activities of D-glucosamine and its derivatives

The growth inhibitory effects of D-glucosamine hydrochloride （GlcNH2-HCl）, D-glucosamine （GlcNH2） and N-acetyl glucosamine （NAG） on human hepatoma SMMC-7721 cells in vitro were investigated. The results showed that GlcNH2.HCl and GlcNH2 resulted in a concentration-dependent reduction in hepatoma cell growth as measured by MTT （3-（4,5-dimethylthiazol- 2-yl）-2,5-diphenyltetrazolium bromide） assay. This effect was accompanied by a marked increase in the proportion of S cells as analyzed by flow cytometry. In addition, human hepatoma SMMC-7721 cells treated with GlcNH2-HCl resulted in the induction of apoptosis as assayed qualitatively by agarose gel electrophoresis. NAG could not inhibit the proliferation of SMMC-7721 cells. GlcNH2-HCl exhibited antitumor activity against Sarcoma 180 in Kunming mice at dosage of 125-500 mg/kg, dose of 250 mg/kg being the best. GlcNH2-HCl at dose of 250 mg/kg could enhance significantly the thymus index, and spleen index and could promote T lymphocyte proliferation induced by ConA. The antitumor effect of GlcNH2-HCl is probably host-mediated and cytocidal.     

仙人掌多糖部分理化性质与抗肿瘤活性的研究

考察了从仙人掌中提取的仙人掌多糖溶液的粘度与溶液浓度、酸碱度、温度、离子强度等因素的关系以及抗肿瘤活性,结果表明,仙人掌多糖具有良好的增稠性,其粘度对盐浓度、pH、温度均有很好稳定性能。动物实验发现仙人掌多糖对S180肿瘤鼠抑制作用较小。     

黄芪成分F_3新制剂抗肿瘤的实验研究

[目的]研究黄芪成分F_3新制剂对荷瘤小鼠生存期及实体瘤生长抑制的影响。[方法]纯系Balb/c小鼠荷瘤后随机分组,连续用药10d,观察腹水荷瘤小鼠的生存时间;观察抑瘤率的小鼠于荷瘤第15d后处死,剥瘤称重。[结果]腹腔注射黄芪成分F_3新制剂能显著延长腹水荷瘤小鼠的生命延长率;对U_(14)、S_(180)实体瘤的抑瘤率分别达71.29％、70.97％。[结论]黄芪成分F_3新制剂对荷瘤小鼠具有显著的抑癌作用。     

Screening the active constituents of Chinese medicinal herbs as potent inhibitors of Cdc25 tyrosine phosphatase, an activator of the mitosis-inducing p34cdc2 kinase

Objective: To screen and evaluate the active constituents of Chinese medicinal herbs as potent inhibitors of Cdc25 phosphatase. Methods: The affinity chromatography purified glutashione-S-transferase/Cdc25A phosphatase fusion protein and Cdc2/cyclin B from the extracts of starfish M phase oocytes are used as the cell cycle-specific targets for screening the antimitotic constituents. We tested 9 extracts isolated from the Chinese medicinal herbs and vegetables including the agents currently used in cancer treatment by measuring the inhibition of Cdc25A phosphatase and Cdc2 kinase activity. The antitumor activity of the extracts was also evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and flow cytometry. Results: Cdc25A inhibitory activity and antitumor activity are detected in the extracts isolated from three Chinese medicinal herbs Agrimona pilosa; Herba solani lyrati; Galla chinesis. Conclusion: We found three extracts isolated from Chinese medicinal herbs have potential inhibitory activity of Cdc25 phosphatase using a highly specific mechanism-based screen assay for antimitotic drug discovery.     

Immunotherapy of intracranial G422 glioblastoma with dendritic cells pulsed with tumor extract or RNA

Objective: To investigate the anti-tumor efficacy of dendritic cell (DC)-based vaccines pulsed with tumor extracts or RNA in a mouse model of intracranial G422 glioblastoma. Methods: Bone marrow-derived DCs were pulsed ex vivo with tumor extracts or RNA. Ninety female mice harboring 4-day-old intracranial G422 glioblastomas and 126 normal mice were treated with three spaced one week apart subcutaneous injections either with PBS, unpulsed DCs, G422 tumor extracts, RNA, DCs pulsed with G422 tumor extracts (DC/extract) or with RNA (DC/RNA). Seven days after the third immunization of normal mice, the spleens of 36 of them were harvested for cytotoxic T lyphocyte (CTL) assays and the others were challenged in the brain with G422 tumor cells. All the treated mice were followed for survival. Some mice brains were removed and examined pathologically when they died. Results: Immunization using DC/extract or DC/RNA significantly induced G422-specific CTL responses compared with control groups (P<0.01). Vaccinatio     

Immunotherapy of intracranial G422 glioblastoma with dendritic cells pulsed with tumor extract or RNA

Objective: To investigate the anti-tumor efficacy of dendritic cell (DC)-based vaccines pulsed with tumor extracts or RNA in a mouse model of intracranial G422 glioblastoma. Methods: Bone marrow-derived DCs were pulsed ex vivo with tumor extracts or RNA. Ninety female mice harboring 4-day-old intracranial G422 glioblastomas and 126 normal mice were treated with three spaced one week apart subcutaneous injections either with PBS, unpulsed DCs, G422 tumor extracts, RNA, DCs pulsed with G422 tumor extracts (DC/extract) or with RNA (DC/RNA). Seven days after the third immunization of normal mice, the spleens of 36 of them were harvested for cytotoxic T lyphocyte (CTL) assays and the others were challenged in the brain with G422 tumor cells. All the treated mice were followed for survival. Some mice brains were removed and examined pathologically when they died. Results: Immunization using DC/extract or DC/RNA significantly induced G422-specific CTL responses compared with control groups (P＜0.01). Vaccination with DC/extract or DC/RNA, either prior to G422 tumor challenge or in tumor-harboring mice, significantly prolonged survival compared with other control groups (P＜0.01). Conclusion: DCs pulsed with tumor extracts or RNA derived from autologous tumors has potential antitumor effects via activation of cell-mediated immunity. Our results suggest a useful therapeutic strategy against gliomas.