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31.
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Manli Zeng Xingyu Wu Fen Li Wensheng She Lin Zhou Benyuan Pi Zhiwen Xu Xiaolin Huang 《Experimental and toxicologic pathology》2017,69(7):527-532
Aims
Laminaria Japonica Polysaccharides (LJP) is a kind of plant polysaccharide isolated from Laminaria Japonica Aresch. LJP has a variety of biological activity, including anti-tumor, improving immune function, anti-radiation and others. This study observed the biological activity of LJP in vitro and in vivo on human nasopharyngeal carcinoma(NPC), and the possible anticancer mechanism was explored.Methods
Nasopharyngeal poorly differentiated squamous cell carcinoma cell lines CNE2 and HONE1 were used for the study. MTT method was used to detect the proliferation of HONE1 and CNE2 treated with gradient concentrations of LJP. The apoptosis of HONE1 treated with LJP was detected by annexin V-FITC/PI double staining method. HONE1 was used to establish subcutaneous implanted tumor model in nude mice. The changes of transplanted tumor volume and body weight of nude mice in each group were observed and recorded. The changes of the ultrastructure of transplanted tumor were observed by transmission electron microscope (TEM).Results
MTT results showed that LJP has inhibitory effect on proliferation of both HONE1 and CNE2, and the effects were dosage-dependent; results of flow cytometry (FCM) analysis showed that, LJP could efficient induce apoptosis in HONE1, and apoptosis rate increased with the increase of LJP concentration. In vivo experiments, the inhibition rate was 33.7% (P < 0.05) and 47% (P < 0.01) in middle and high dose LJP group, respectively. TEM results suggested that the cancer cells in the transplanted tumor tissue treated with middle and high dose LJP presented unique apoptosis changes.Conclusions
LJP can effectively inhibit the growth of NPC cells. And it may be achieved by inducing apoptosis of NPC cells. 相似文献33.
Helicobacter pylori (H. pylori) is the most important etiological agent of chronic active gastritis, peptic ulcer disease and gastric cancer. The aim of this study was to evaluate the efficacy of alkyl hydroperoxide reductase (AhpC) and mannosylated AhpC (mAhpC) as candidate vaccines in the C57BL/6J mouse model of H. pylori infection. Recombinant AhpC was cloned, over-expressed and purified in an unmodified form and was also engineered to incorporate N and C-terminal mannose residues when expressed in the yeast Pichia pastoris. Mice were immunized systemically and mucosally with AhpC and systemically with mAhpC prior to challenge with H. pylori. Serum IgG responses to AhpC were determined and quantitative culture was used to determine the efficacy of vaccination strategies. Systemic prophylactic immunization with AhpC/alum and mAhpC/alum conferred protection against infection in 55% and 77.3% of mice, respectively. Mucosal immunization with AhpC/cholera toxin did not protect against infection and elicited low levels of serum IgG in comparison with systemic immunization. These data support the use of AhpC as a potential vaccine candidate against H. pylori infection. 相似文献
34.
SPF级实验兔的研究始于1950年代末,至今已有50多年的发展历程.为更好了解国内外SPF级实验兔的发展状况,为今后的研究提供更丰富的资料,本文从SPF级实验兔的培育和饲养管理、生物学特性和应用研究三个方面进行阐述. 相似文献
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目的:对皖南医学院SPF级实验动物屏障环境设施技术指标进行检测及分析,以确保达到保障实验动物和动物实验质量的目的。方法:以GB14925-2010为检测依据和综合判定原则,选用专业检测仪器进行屏障环境相关指标采集和评判。结果:屏障环境设施各项技术指标,如温度、相对湿度、噪声、工作照度、动物照度、换气次数、气流速度、静压差、空气洁净度、沉降菌、氨浓度等均符合国家标准。结论:皖南医学院SPF级实验动物屏障环境设施可以有力保障实验动物和动物实验的质量,为科学研究提供高品质的实验材料,确保实验结果的科学性、准确性与可重复性。 相似文献
37.
Abbas MA Spackman E Fouchier R Smith D Ahmed Z Siddique N Sarmento L Naeem K McKinley ET Hameed A Rehmani S Swayne DE 《Vaccine》2011,29(43):7424-7429
Vaccination has been a critical tool in the control of some avian influenza viruses (AIV) and has been used routinely in Pakistan to help control sporadic outbreaks of highly pathogenic (HP) H7 AIV since 1995. During that time, several AIV isolates were utilized as inactivated vaccines with varying degrees of success. In order to evaluate which H7 AIV strains may serve as optimal vaccines for diverse H7 AIVs from Pakistan we conducted vaccination-challenge studies with five H7 vaccines against challenge with two HPAIVs: A/chicken/Murree/NARC-1/1995 H7N3 and A/chicken/Karachi/SPVC-4/2004 H7N3. To further characterize the isolates antigenic cartography was used to visually demonstrate the antigenic relationships among the isolates. All vaccines provided similar protection against mortality, morbidity and shedding of challenge virus from the respiratory tract. However, some minor (not statistically significant) differences were observed and correlated with antibody levels induced by the vaccine prior to challenge. 相似文献
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cerbB2又称neu或HER2基因,在10%~40%的乳腺癌病人中有扩增[1~3],其编码为185kDa,具有酪氨酸激酶活性的糖蛋白,位于17号染色体q21区带上[4]。有报道cerbB2蛋白的过度表达同乳腺癌病人较短期的无复发生存有关,尤其是对腋淋巴结阳性者[2,5,6]。在乳腺癌良性病变及正常乳腺组织中无cerbB2基因蛋白表达[7]。由于其与表皮生长因子受体(Epidermalgrowthfactorreceptor,EGFR)近似(170kDa)[8,9],人们推断它的过… 相似文献
40.
Yi-Na Huang Ying-Lan Zhao Xiao-Ling Gao Zhi-Feng Zhao Zan Jing Rong Yang Tao Tong Jia-Qi Cen 《Journal of ethnopharmacology》2010,131(2):306-431