共查询到19条相似文献,搜索用时 296 毫秒
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癌症的发病率与死亡率逐年递增,严重威胁人类健康。目前,以化疗为主治疗癌症的方法虽能延长患者的生存时间,但其严重的不良反应往往使患者预后不良。故寻找高效低毒的抗癌药物已成为全世界临床共同关注的焦点。中药有效成分,具有不良反应小、多靶点调控等优势,其抗肿瘤活性受到广大科研者的热爱。紫草素为萘醌类化合物,是紫草的主要有效成分之一,具有抗肿瘤、抗炎、抗氧化等药理作用。研究表明,紫草素对多种肿瘤细胞显示出显著的抗肿瘤活性,能够抑制乳腺癌、肺癌、肝癌、宫颈癌、卵巢癌、结肠癌、前列腺癌等多种癌症的发生发展。紫草素抗肿瘤机制主要是通过多途径、多靶点抑制肿瘤细胞增殖,促进活性氧(ROS)生成,诱导肿瘤细胞发生凋亡,阻滞细胞周期,诱导肿瘤细胞自噬,抑制肿瘤细胞迁移与侵袭等。此外,紫草素还能增加肿瘤细胞对抗肿瘤药物的敏感性,逆转肿瘤细胞耐药性。紫草素抗肿瘤作用涉及的信号通路有磷脂酰肌醇3-激酶/蛋白激酶B(PI3K/Akt),PI3K/Akt/哺乳动物雷帕霉素靶蛋白(mTOR),丝裂原活化蛋白激酶(MAPK),丙酮酸激酶同工酶M2/信号传导与转录激活因子3(PKM2/STAT3),Kelch样环氧氯丙烷相关蛋白1/核因子E2相关因子2(Keap1/Nrf2)等,但主要通过调控PI3K/Akt信号通路发挥抗肿瘤作用。笔者查阅国内外关于紫草素抗肿瘤作用及机制的相关文献,对其近3年的相关研究进行归纳总结,为紫草素的抗肿瘤作用进一步深入研究及抗肿瘤药物的新药研发提供相应参考。 相似文献
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田琳 《国际中医中药杂志》2002,(4)
两种来源于骨髓的树突状细胞:郎格罕氏细胞(LCs)和树状表皮T细胞(DETCs)构成了皮肤的免疫系统。研究表明,紫草素及其衍生物具有抗菌、抗炎、抗肿瘤等多种药理作用,然而,其对树状免疫细胞的作用还不明确。本次对紫草、紫草素、紫朱草素(Alkannin)等诱导的鼠体内LCs和DETCs进行形态学研究。 材料和方法:按照文献报道的条件经HPLC从紫草中制备紫草素(R型)、紫朱草素(S型)。紫草素、紫朱草素溶于含1%吐 相似文献
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紫草为紫草科植物新疆紫草Arnebia euchroma或内蒙紫草A.guttata的干燥根,《中国药典》记载其具有清热凉血、活血解毒、透疹消斑的功效。紫草素是从紫草中提取出来的萘醌类化合物,目前,紫草素及其衍生物在各种癌症的治疗中被广泛研究。主要从机体的免疫系统、肿瘤细胞的侵袭和转移、肿瘤细胞凋亡、肿瘤细胞的有氧糖酵解及肿瘤细胞周期5个方面综述紫草素抑制卵巢癌作用机制的研究进展,为紫草素治疗卵巢癌的临床研究提供参考依据。 相似文献
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Wanyan Wang Yu Wu Si Chen Xi Liu Jiacheng He Shuyi Wang Weiqiang Lu Yong Tang Jin Huang 《Phytotherapy research : PTR》2021,35(1):463-476
Triple‐negative breast cancer (TNBC) is heterogeneous disease with a poor prognosis. It is therefore important to explore novel therapeutic agents to improve the clinical efficacy for TNBC. The inosine 5′‐monophosphate dehydrogenase 2 (IMPDH2) is a rate‐limiting enzyme in the de novo synthesis of guanine nucleotides. It is always overexpressed in many types of tumors, including TNBC and regarded as a potential target for cancer therapy. Through screening a library of natural products, we identified shikonin, a natural bioactive component of Lithospermum erythrorhizon, is a novel and selective IMPDH2 inhibitor. Enzymatic analysis using Lineweaver–Burk plot indicates that shikonin is a competitive inhibitor of IMPDH2. The interaction between shikonin and IMDPH2 was further investigated by thermal shift assay, fluorescence quenching, and molecular docking simulation. Shikonin treatment effectively inhibits the growth of human TNBC cell line MDA‐MB‐231, and murine TNBC cell line, 4T1 in a dose‐dependent manner, which is impaired by exogenous supplementation of guanosine, a salvage pathway of purine nucleotides. Most importantly, IMPDH2 knockdown significantly reduced cell proliferation and conferred resistance to shikonin in TNBC. Collectively, our findings showed the natural product shikonin as a selective inhibitor of IMPDH2 with anti‐TNBC activity, impelling its further study in clinical trials. 相似文献
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雷公藤甲素是从雷公藤中提取的环氧化二萜内酯化合物,对卵巢癌体外培养细胞及体内实体瘤均有显著的抑制作用,并可有效抑制耐顺铂卵巢癌细胞的生长。综合近年来国内外对雷公藤甲素抗卵巢癌的最新研究结果,对雷公藤甲素抗卵巢癌的作用及其诱导卵巢癌细胞凋亡、干预细胞周期、抑制癌细胞转移等方面的机制进行综述。 相似文献
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Ethnopharmacological relevance
Lithospermum erythrorhizon, a naphthoquinone compound derived from a shikonin, has long been used as traditional Chinese medicine for treatment of various diseases, including cancer. To evaluate the cytotoxic effects of shikonin on AGS gastric cancer cells via induction of cell cycle arrest.Materials and methods
We observed the effects of 12.5–100 ng/mL dosage of shikonin treatment on AGS cancer cell line with the incubation time of 6 h. Cytotoxic effects were assessed by measuring the changes in the intracellular ROS, appearance of senescence phenotype, cell cycle progression, CDK and cyclins expression levels upon shikonin treatment. We also examined upon the activation of Egr1-mediated p21 expression, by siRNA transfection, Luciferase assay, and ChIP assay.Results
In this study, we found that shikonin inhibits cell proliferation by arresting cell cycle progression at the G2/M phase via modulation of p21 in AGS cells. Also, our results revealed that the p21 gene was transactivated by early growth response1 (Egr1) in response to the shikonin treatment. Transient Egr1 expression enhanced shikonin-induced p21 promoter activity, whereas the suppression of Egr1 expression by small interfering RNA attenuated the ability of shikonin to induce p21 promoter activity.Conclusion
Our results suggested that the anti-proliferative activity of shikonin was due to its ability to induce cell cycle arrest via Egr1–p21 signaling pathway. Thus, the work stated here validates the traditional use of shikonin in the treatment of cancer. 相似文献15.
青蒿治疗疟疾已有1600多年的历史,青蒿素是从黄花蒿Artemisia annua茎叶中提取的含过氧基团的倍半萜内酯,已成为一个全新的天然抗疟药。青蒿素及其衍生物(双氢青蒿素、青蒿琥酯、蒿甲醚)因其确切的抗疟效果走向世界,随之越来越多的潜在药理活性被发掘,如抗菌、杀虫、抗炎、抗癌、免疫调节等活性。近年来随着对青蒿素及其衍生物的研究和探索,发现其能通过调节多种信号通路、抗氧化应激以及调节激素受体和CD4~+T细胞亚群分化等途径治疗狼疮性肾炎、免疫球蛋白A(immunoglobulin A,IgA)肾病、糖尿病肾病、膜性肾病、肾纤维化及急性肾损伤,使其成为慢性肾脏病领域极具开发潜力的药物。 相似文献
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恶性肿瘤是全球面临的共同难题,同时也给世界各国带来了超负荷的经济负担。藤黄酸是藤黄Garcinia hanburyi中一种笼状呫吨酮类活性成分,具有抗炎、改善视网膜病变、脏器保护等多种药理活性。近年来,大量研究证实藤黄酸可作为一种潜力巨大的抗肿瘤化合物用于肝癌、肺癌、乳腺癌、结直肠癌等多种癌症的治疗,其机制涉及抑制细胞增殖、阻碍迁移和侵袭、诱导凋亡和自噬、抑制血管生成、诱导铁死亡和焦亡、靶向肿瘤炎症微环境和免疫调控等。此外,大量研究发现藤黄酸可与多种化疗药物或天然产物联合用于癌症的协同治疗。因此,重点总结了藤黄酸的抗肿瘤作用机制及其协同其他药物抗肿瘤的研究进展,为藤黄酸抗肿瘤研究提供参考依据。 相似文献
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Long S GuangZhi Y BaoJie G Wei X YanYong H YingLi W Yang Z LiHua L 《Phytotherapy research : PTR》2012,26(1):26-33
Shikonin, a major component of Lithospermum erythrorhizon and Arnebia euchroma, exhibits antiinflammatory, immunomodulatory and antitumour activities. Although many recent studies have focused on the antitumour effects of shikonin, the exact mechanisms underlying its antitumour and immunomodulatory effects in tumour‐bearing mice remain unclear. The aim of the present study was to investigate the antitumour and immunomodulatory effects of shikonin derivatives (ShD) in tumour‐bearing mice. Swiss mice inoculated with hepatoma HepA22 or sarcoma 180 (S180) cells were treated with ShD or 5‐fluorouracil (5Fu). Survival time, immune organs, natural killer cell activity, lymphocytes, lymphocyte transformation and interleukin (IL)‐2 production were analysed. ShD significantly prolonged the survival (median survival time prolonged by >7 days) of tumour‐bearing mice in a dose‐dependent manner, inhibited the growth of transplantable neoplasms (inhibitory rate, > 33%), and recovered (at [ShD] = 2.5 mg/kg/day) or increased (at [ShD] > 5 mg/kg/day) the number of CD3‐ and CD19‐positive cells. ShD also played a role in protecting the immune organs from damage and reversed or enhanced immune responses, as noted by the nearly normal thymic structure; enlarged splenic corpuscles; and improved natural killer cell activity, lymphocyte transformation and IL‐2 production in ShD‐treated mice. ShD reduced the tumour load of tumour‐bearing mice and protected the immune organs against tumour‐induced damage and immune function impairment. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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泽漆(Euphorbia helioscopia L.)是大戟科大戟属多年生草本植物,功效为利水消肿、祛痰退热、杀虫止痒、散结。通过现代科学手段鉴定了泽漆中一系列的药效物质,药理活性研究表明泽漆及其复方在细胞和动物水平具有一定抗肿瘤作用,尤其对肺腺癌、肝癌、胃癌及乳腺癌作用明显,实际临床应用多采用泽漆汤及其加减方或联合化疗等手段辅助治疗肝癌、肺癌、乳腺癌、恶性腹水等疾病。文章就近年来国内外关于泽漆及其复方抗肿瘤方面药理作用与临床治疗研究概况进行梳理与总结,以期为泽漆及其复方实验与临床研究及开发提供思路。 相似文献
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随着中医药抗肿瘤研究的深入,越来越多的中药被发现并证实具有很好的抗肿瘤效果。其中南蛇藤及其有效成分抗肿瘤的研究已近20年,许多研究已经证实南蛇藤及其有效成分具有很好的抗胃癌活性。已经被分离和证实具有抗肿瘤活性的成分包括萜类化合物、脂肪类化合物和苷类化合物等,其中萜类化合物的抗肿瘤活性最强。南蛇藤及其有效成分抗胃癌的主要作用为抑制胃癌细胞的增殖、诱导胃癌细胞凋亡、抑制胃癌细胞侵袭转移和上皮间质转化(epithelial-mesenchymal transformation,EMT)、抑制胃癌血管生成和逆转胃癌多药耐药等。这些研究结果对深入挖掘南蛇藤抗胃癌活性成分和分子机制具有非常重要意义。从南蛇藤抗胃癌的有效成分及其南蛇藤抗胃癌的作用机制研究2个方面对南蛇藤抗胃癌的相关研究进行综述,为今后南蛇藤的进一步开发和利用提供参考。 相似文献