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1.肿瘤多药耐药性多药耐药性是指肿瘤细胞因暴露于一种细胞毒药物而致对广泛结构和功能无关化合物发展交叉耐药性这一现象.而其产生原由则多与此类细胞特定蛋白如胞膜转运蛋白表达提高有关。后者由于能够降低药物胞内浓度,故成为影响许多类型肿瘤化疗治疗成功的主要障碍之一。从临床实践经验看,和肿瘤多药耐药性关联最为密切的细胞毒药物多是疏水性的两性天然产品。 相似文献
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在肿瘤的治疗手段中,化疗一直占据着不可替代的地位。联合化疗虽然对少数恶性肿瘤(如睾丸癌和儿童急性白血病)有明显的治疗效果,但对大多数恶性肿瘤却收效甚微,这其中一个很重要的原因就是肿瘤细胞对化疗药物产生了耐药性。 相似文献
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维拉帕米逆转肿瘤多药耐药性的研究进展 总被引:2,自引:0,他引:2
肿瘤细胞对化疗药物产生的多药耐药(MDR)已成为当前影响肿瘤化学治疗疗效的主要障碍,寻找低毒有效的MDR逆转剂是提高化疗疗效的关键。MDR产生机制复杂,由mdrl基因编码的P-糖蛋白(P-glycoprotein P-gp)的过表达是产生MDR的主要原因。维拉帕米是应用最早的MDR逆转剂之一,但其毒副作用大大限制了临床应用。从维拉帕米分离出的光学异构体R-型维拉帕米,在逆转肿瘤MDR时,更加高效安全,具有良好的临床应用前景。 相似文献
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膀胱肿瘤多药耐药性的逆转 总被引:1,自引:0,他引:1
膀胱肿瘤的治疗基本上是以手术结合腔内灌注化疗为主。然而化疗后的复发率很高,其中一个重要的原因是由于化疗过程中肿瘤细胞多药耐药(MDR)的产生。MDR是指肿瘤细胞接触一种化疗药物后,不仅对该药产生耐受性,而且对其他结构及作用机制不同的药物也产生交叉耐受。交叉耐药的产生 相似文献
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肿瘤多药耐药性及其逆转剂研究进展 总被引:3,自引:2,他引:3
肿瘤细胞的多药耐药性 (MDR)成为目前肿瘤化疗的难点。MDR的产生机制有多种 ;同时有多种具有逆转作用的药物被发现。现对几种最有可能的MDR产生机制及较有前景的逆转剂作简要综述 相似文献
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随着耐药结核病,尤其是耐多药结核病(MDR—TB)和广泛耐药结核病(XDR-TB)发病率的不断上升使得结核病疫情再度上升,成为全球所必须共同面对的重大公共卫生和社会问题。进入21世纪,随着人类回归自然、追求天然潮流的发展,在天然产物中寻找抗结核新药已成为当前抗结核新药研发的热点领域之一。现就近年来天然产物或基于天然产物半合成或全合成的抗耐多药结核优秀候选药物进行综述。 相似文献
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肿瘤多药耐药是肿瘤治疗过程中一个亟待解决的难题,其表现为肿瘤细胞对单一或多种化疗药物同时出现耐药性,从而导致治疗失败,与药物的化学结构和作用机制无关。将化疗药物与肿瘤多药耐药逆转剂联合应用是目前公认的治疗方案之一。黄酮类化合物由于其低毒、高效,具有多种药理作用等优点而受到广泛的关注。在肿瘤治疗期间,黄酮类化合物能通过抑制ABC转运体、诱导凋亡、调节氧化应激等作用逆转肿瘤多药耐药。归纳总结了黄酮类化合物逆转肿瘤多药耐药的主要机制、应用及其纳米剂型改造的进展,为进一步的临床研究提供参考。 相似文献
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ATP结合盒转运体介导的肝癌多药耐药研究进展 总被引:1,自引:0,他引:1
ATP结合盒转运体(ABC转运体)介导的多药耐药(MDR)是肝癌化疗失败的主要原因,研究确定天然的及获得性MDR的产生机制,有利于提出更有效的治疗措施。针对ATP结合盒转运体的肿瘤MDR逆转策略,对于肝癌化疗效果的提高具有重要意义。此外,ATP结合盒转运体可能参与了肿瘤生物学的一些重要过程,发挥药物外排泵以外的作用,为肿瘤的治疗提供了新的研究方向。 相似文献
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Zhou WJ Zhang X Cheng C Wang F Wang XK Liang YJ To KK Zhou W Huang HB Fu LW 《British journal of pharmacology》2012,166(5):1669-1683
BACKGROUND AND PURPOSE
Besides targeting the well-known oncogenic c-Met, crizotinib is the first oral tyrosine kinase inhibitor inhibiting anaplastic lymphoma kinase (ALK) in clinical trials for the treatment of non-small cell lung cancer. Here, we assessed the possible reversal of multidrug resistance (MDR) by crizotinib in vitro and in vivo.EXPERIMENTAL APPROACH
1-(4,5-Dimethylthiazol-2-yl)-3,5- diphenylformazan was used in vitro and xenografts in nude mice were used in vivo to investigate reversal of MDR by crizotinib. To understand the mechanisms for MDR reversal, the alterations of intracellular doxorubicin or rhodamine 123 accumulation, doxorubicin efflux, ABCB1 expression level, ATPase activity of ABCB1 and crizotinib-induced c-Met, Akt and ERK1/2 phosphorylation were examined.KEY RESULTS
Crizotinib significantly enhanced the cytotoxicity of chemotherapeutic agents which are also ABCB1 substrates, in MDR cells with no effect found on sensitive cells in vitro and in vivo. Additionally, crizotinib significantly increased intracellular accumulation of rhodamine 123 and doxorubicin and inhibited the drug efflux in ABCB1-overexpressing MDR cells. Further studies showed that crizotinib enhanced the ATPase activity of ABCB1 in a concentration-dependent manner. However, expression of ABCB1 was not affected, and reversal of MDR by crizotinib was not related to the phosphorylation of c-Met, Akt or ERK1/2. Importantly, crizotinib significantly enhanced the effect of paclitaxel against KBv200 cell xenografts in nude mice.CONCLUSIONS AND IMPLICATIONS
Crizotinib reversed ABCB1-mediated MDR by inhibiting ABCB1 transport function without affecting ABCB1 expression or blocking the Akt or ERK1/2 pathways. These findings are useful for planning combination chemotherapy of crizotinib with conventional chemotherapeutic drugs. 相似文献13.
多药耐药(MDR)是阻碍肿瘤化疗成功的一大障碍,其机制之一就是耐药的肿瘤细胞高表达三磷酸腺苷(ATP)结合盒(ABC)转运体。依据此机制提出克服肿瘤细胞耐药的策略即开发外排转运体抑制剂,以期逆转MDR。最近的研究发现肿瘤干细胞也可能是通过表达外排转运体天然耐药,这就提供了一个新的抗癌药物作用靶点。对介导肿瘤细胞多药耐药的ABC转运体及其抑制剂的开发作一综述。 相似文献
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多药耐药(MDR)是阻碍肿瘤化疗成功的一大障碍,其机制之一就是耐药的肿瘤细胞高表达三磷酸腺苷(ATP)结合盒(ABC)转运体。依据此机制提出克服肿瘤细胞耐药的策略即开发外排转运体抑制剂,以期逆转MDR。最近的研究发现肿瘤干细胞也可能是通过表达外排转运体天然耐药,这就提供了一个新的抗癌药物作用靶点。对介导肿瘤细胞多药耐药的ABC转运体及其抑制剂的开发作一综述。 相似文献
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肿瘤多药耐药(MDR)是导致肿瘤化疗失败的主要原因之一。肿瘤MDR的机制有多种,其中外排型转运体的过表达是导致MDR的主要机制,因此研究外排型转运体介导的肿瘤MDR机制和发现可以逆转肿瘤MDR的抑制剂成为国内外研究的热点。就目前研究的3种三磷酸腺苷结合盒转运体:P-糖蛋白、多药耐药相关蛋白、乳腺癌耐药蛋白介导的MDR及逆转MDR的机制进行综述,以期为提高肿瘤治疗疗效提供依据。 相似文献
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肿瘤多药耐药(multidrug resistance,MDR)是导致肿瘤化疗失败、影响治疗效果的主要原因之一。随着生物技术的快速发展,纳米载体在逆转MDR方面呈现出增强药物靶向性、减少药物外排、降低药物毒副作用等明显优势,受到国内外学者的广泛关注。本文就肿瘤MDR发生机制和纳米载体逆转MDR方面的研究成果作一综述。 相似文献
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Yang Liping He Jian Tao Zhenchao Zhou Yan Yang Jing Zhang Yangyang Gao Jing Qian Liting 《Drug delivery》2022,29(1):229
Cancer poses a serious threat to human health and is the most common cause of human death. Polymer-based nanomedicines are presently used to enhance the treatment effectiveness and decrease the systemic toxicity of chemotherapeutic agents. However, the disadvantage of currently polymeric carriers is without therapy procedure. Herein, for the first time, glutathione (GSH)-responsive polymer (PRES) with anti-cancer effect was synthesized following the condensation–polymerization method using resveratrol (RES) and 3,3′-dithiodipropionic acid. PRES can not only suppress the tumor cells growth but can also self-assemble into nanoparticles (∼93 nm) for delivering antitumor drugs, such as paclitaxel (PTX@PRES NPs). The system could achieve high drug loading (∼7%) and overcome multidrug resistance (MDR). The results from the in vitro studies revealed that the NPs formed of PRES were stable in the systemic circulation, while could be efficiently degraded in tumor cells high GSH environment. Results from cytotoxicity tests confirmed that PTX@PRES NPs could effectively suppress the growth of cancer cells (A549) and drug-resistant cells (A549/PTX). The NPs could also be used to significantly increase the therapeutic efficacy of the drugs in A549/PTX tumor-bearing mice. In vivo investigations also demonstrated that the PRES-based NPs exhibited tumor inhibition effects. In summary, we report that the GSH-responsive polymer synthesized by us exhibited multiple interesting functions and could be used for effective drug delivery. The polymer exhibited good therapeutic effects and could be used to overcome MDR. Thus, the synthesized system can be used to develop a new strategy for treating cancer. 相似文献