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蛇毒膜毒素抗肿瘤作用的研究进展 总被引:12,自引:1,他引:12
蛇毒膜毒素抗肿瘤作用的研究进展杨惠玲,郭禹标蛇毒含有各种酶类和多种不同生理与药理活性蛋白。自1936年sarker[1]用盐析法从眼镜蛇(Najanajaatra)蛇毒中分离出一个能使离体猫心停搏的毒素以来,各种类似毒素如心脏毒素(Cardiotox... 相似文献
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抗肿瘤血管生成和细胞凋亡研究进展 总被引:1,自引:0,他引:1
一、简介 血管生成是内皮细胞的激活、增殖、迁移、血管基底膜的降解、血管和血管网的形成以及血管网的连接等复杂过程.在机体发育、再生、修复和许多病理情况下都有发生,且有关键作用.肿瘤血管生成是指肿瘤细胞诱导的微血管生长以及肿瘤中血液微循环建立的过程.很大程度上受血管生成因子和血管抑制因子的调节.肿瘤细胞、内皮细胞和巨噬细胞受缺氧. 相似文献
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抗肿瘤血管生成机制及治疗研究进展 总被引:2,自引:0,他引:2
传统的肿瘤治疗多针对肿瘤细胞,大量研究表明这种治疗存在很多缺点如容易产生肿瘤耐药性,有时药物不易进人肿瘤细胞内部则作用受限等。后来,Eolkman等提出实体肿瘤的生长和转移依赖于新生血管生成的观点后,国内外研究者做了大量基础实验、动物实验、临床前期试验对肿瘤血管生成机制进行了深入研究,对抗肿瘤血管生成疗法治疗肿瘤进行了许多探索,并取得了较大进展,使抑制或破坏肿瘤血管生成, 相似文献
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蟾毒灵属于传统中药蟾酥中的蟾酥二烯羟酸内脂之一,其结构与地高辛相似,是一种拓朴异构酶Ⅱ抑制剂.它通过诱导细胞凋亡及阻滞细胞增殖周期进程而抑制肿瘤细胞增殖,同时还具有诱导肿瘤细胞分化及抗肿瘤血管生成作用.其作用机制与特定信号转导通路及癌基因和抑癌基因的表达有关. 相似文献
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蟾毒灵属于传统中药蟾酥中的蟾酥二烯羟酸内脂之一,其结构与地高辛相似,是一种拓朴异构酶II抑制剂。它通过诱导细胞凋亡及阻滞细胞增殖周期进程而抑制肿瘤细胞增殖,同时还具有诱导肿瘤细胞分化及抗肿瘤血管生成作用。其作用机制与特定信号转导通路及癌基因和抑癌基因的表达有关。 相似文献
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L-氨基酸氧化酶(LAAO)作为蛇毒中的一个重要成分,有着多样的生物学活性,近年来许多文献报道LAAO的生化作用和药理作用,提供了许多关于其对血小板活性、诱导细胞凋亡、细胞毒性、抗菌等方面的资料,本文就蛇毒L-氨基酸氧化酶(SV-LAAO)的理化性质、生物学特性及其可能的抗肿瘤作用及作用机制作一综述。 相似文献
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Jing Zhao Weiguo Hu Zejia Zhang Zegao Zhou Jiayue Duan Zheng Dong Hao Liu Changqing Yan 《Journal of gastrointestinal oncology.》2022,13(2):847
BackgroundPancreatic cancer seriously threatens human health. Bee venom is a mixture of enzymes, peptides, and amines. Due to its biological activity, bee venom is widely used as an anti-inflammatory agent and pain reliever. However, little is known about the effect of bee venom on pancreatic cancer.MethodsFirstly, the Cell Counting Kit-8 (CCK-8) assay was conducted to analyze the cytotoxicity of bee venom on PANC-1 and AsPC-1 cells. Then, we evaluated the cell cycle and apoptosis by flow cytometry and the terminal deoxynucleotidyl transferase (TdT) dUTP Nick-End Labeling (TUNEL) assay. In addition, cell migration was analyzed by the cell scratch test and Transwell assay. Western blot was performed to assess the expression of proteins involved in the regulation of cell cycle arrest and apoptosis.ResultsResults demonstrated that bee venom significantly suppressed cell proliferation via inducing cell cycle arrest and apoptosis with suppression of cell migration. Bee venom induced S phase arrest and ameliorated the protein expression of cyclins and cyclin-dependent kinases (CDKs). At the same time, bee venom can activate the p53–p21 pathway. Experimental data also showed that bee venom induced cell apoptosis and impeded cell migration.ConclusionsThe present study revealed that bee venom could effectively inhibit tumor progression in pancreatic cancer cells, indicating the possibility of bee venom as an anti-tumor drug in pancreatic cancer. 相似文献
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BACKGROUND: There is a need for novel antitumor agents that demonstrate efficacy in currently refractory tumors without adding to the toxicity of therapy. The somatostatin analogs, which have demonstrated antineoplastic activities in experimental tumor models, and good tolerability and safety profiles are attractive candidates. MATERIALS AND METHODS: Data from preclinical studies provide evidence for direct and indirect mechanisms by which somatostatin analogs exert antitumor effects. RESULTS: Direct antitumor activities, mediated through somatostatin receptors (sst(1)-sst(5)) expressed in tumor cells, include blockade of autocrine/paracrine growth-promoting hormone and growth factor production, inhibition of growth factor-mediated mitogenic signals and induction of apoptosis. Indirect antitumor effects include inhibition of growth-promoting hormone and growth factor secretion, and antiangiogenic actions. Many human tumors express more than one somatostatin receptor subtype, with sst(2) being predominant. Somatostatin analogs such as octreotide and lanreotide, which present a high affinity for sst(2), are in current clinical use to alleviate symptoms in patients with endocrine tumors, and radiolabeled somatostatin analogs have been developed for diagnosis and radiotherapy. CONCLUSIONS: While the rationale exists for the use of somatostatin analogs as antitumor agents, studies are ongoing to identify analogs with activity across the range of receptor subtypes to maximize the potential of such treatment. 相似文献
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华蟾素注射液及其活性成份抗肿瘤机制的研究进展 总被引:6,自引:0,他引:6
华蟾素注射液是临床应用较广的抗肿瘤中药制剂,具有抗肿瘤、增强机体免疫力等作用,但对其确切的有效成份仍需进一步研究。本文将近年国内外华蟾素注射液及其活性成份在抑制肿瘤细胞增殖、诱导肿瘤细胞分化、促进肿瘤细胞凋亡、提高机体免疫力等方面的实验研究进行综述,供临床应用参考。 相似文献
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目的:探讨蝎毒(scorpid poison)与眼镜蛇毒(cobra venom)联合应用对胃癌细胞BGC-803凋亡的影响及作用机制。方法:用蝎毒和(或)眼镜蛇毒处理体外传代培养的胃癌细胞株BGC-803。荧光显微镜下观察细胞增殖变化、进行活细胞计数及计算细胞增殖抑制率,流式细胞仪检测细胞凋亡,RT-PCR观察凋亡相关基因Bcl-2表达的变化。结果:蝎毒与眼镜蛇毒联合应用相对于单用蝎毒或眼镜蛇毒可显著提高胃癌细胞凋亡率、抗凋亡基因Bcl-2表达明显下降(P<0.05)。随着蝎毒和眼镜蛇毒合用浓度的增高,胃癌细胞凋亡率增加、抗凋亡基因Bcl-2表达下降更明显(P<0.05)。同一药物浓度作用24h与48h相比,亦有明显差异(P<0.05)。结论:蝎毒与眼镜蛇毒联合应用具有协同抗胃癌细胞的作用,并具有浓度和时间依赖性,其机制可能与增强诱导胃癌细胞凋亡及调控凋亡相关基因Bcl-2的表达有关。 相似文献