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千金藤素对化疗药物减毒增效及抗肿瘤转移作用研究
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摘要
肿瘤是严重危害人类健康的疾病之一,目前治疗癌症的手段主要是手术切除、放疗或化疗。对于较早期未扩散或转移的癌灶,采用手术切除或放疗较为成功,但对于发现时已处于晚期的肿瘤患者则不甚理想;而且放、化疗在杀死癌细胞的同时,对增殖旺盛的正常细胞也有一定影响,导致呕吐、腹泻、脱发和骨髓抑制等不良反应,严重影响了患者的生存质量。本课题分别从体内实验和体外实验两个方面,研究了千金藤素联合化疗药物对肿瘤的抑制作用,并探讨了其提高机体免疫力、诱导肿瘤细胞凋亡、阻止肿瘤细胞侵袭等的可能机制。
     通过口服千金藤素来明确其是否对肿瘤生长具有抑制作用:进行联合化疗药物的抑瘤实验,明确千金藤素是否对化疗药具有增效作用;检测白细胞、红细胞及血清ALT和BUN等的水平、骨髓有核细胞的数目,明确千金藤素对荷瘤化疗小鼠的一般药理学指标;分析千金藤素对脾脏、胸腺指数及白细胞的DNA的影响,明确千金藤素是否具有增强免疫的作用;然后,分别采用粘附分析实验、划痕实验、人工基底膜体外重建实验、明胶酶谱分析等方法观察千金藤素对人纤维肉瘤细胞HT1080等体外侵袭过程的影响;采用吖啶橙染色和流式细胞技术检测千金藤素对肿瘤细胞凋亡的诱导作用;采用集落形成法测定千金藤素对肿瘤细胞恶性程度的影响。
     实验结果表明:1.千金藤素能够剂量依赖性地抑制小鼠移植实体瘤的生长,并对化疗药物有增效减毒作用。千金藤素明显延长荷瘤(S180)小鼠的生存期,腹腔注射千金藤素(20mg/kg体重)可使U14瘤重抑制率达30.8%(P<0.01);可使B16-F10瘤重抑制率达35.8%(P<0.01)。与模型组比较,小鼠生存时间延长42.6%(P<0.01)。千金藤素与CTX联合应用时,抑瘤活性明显提高(p<0.01)。中、高剂量千金藤素(10、20mg/kg)与CTX联用组的抑瘤率(分别为44.9%和62.5%)要高于CTX单用组(p<0.05,p<0.01)。中、高剂量千金藤素与CTX联用后与单独使用CTX比较,可使化疗荷瘤小鼠外周红细胞明显增多(P<0.01),分别提高3.7%和8.3%,可使小鼠外周血红蛋白值明显升高(P<0.01),分别提高7.3%和9.1%。千金藤素与CTX联用后,治疗组较正常组,白细胞下降幅度较少,与CTX组相比差异显著(P<0.01);单独使用CTX组的荷瘤小鼠血清ALT水平显著高于正常组(P<0.01),千金藤素与CTX联用后,与CTX单用组相比差异显著(P<0.01);千金藤素与CTX联用后,与CTX单用组相比较,小鼠骨髓有核细胞数目显著(P<0.01)增多;千金藤素与CTX联用后,小鼠脾淋巴细胞转化率显著(P<0.01)升高。小鼠接种U14瘤株,千金藤素与CTX联用后,荷瘤小鼠的脾脏指数、胸腺指数有明显的提升(P<0.01);千金藤素能够剂量依赖性地预防环磷酰胺所致DNA损伤。以上结果说明千金藤素对CTX抑瘤能够产生一定的增效减毒作用。
     2.千金藤素单独作用能够浓度依赖性地抑制人纤维肉瘤细胞HT-1080、肝癌细胞SMMC7721、Hela细胞等肿瘤细胞增殖(2~40μM),药物对上述肿瘤细胞的IC50值分别为12.37±1.64μM,12.58±1.05μM,11.83±1.33μM(处理48 hr);而且千金藤素能够诱导肝癌细胞凋亡。经AO/EB染色后,计数凋亡细胞,4μM千金藤素处理48小时SMMC7721细胞。细胞凋亡率可达24.7%(P<0.01)。
     3.千金藤素能够抑制肿瘤细胞浸润和转移。与对照组比较,4μM药物预处理48小时后,HT1080细胞的侵袭能力显著降低(p<0.01)。而且能够剂量依赖性地显著抑制肿瘤细胞与基底膜的粘附,减弱肿瘤细胞的运动能力和侵袭力,降低基质金属蛋白酶2(MMP-2)的活性和表达量,上调金属蛋白酶组织抑制剂2(TIMP-2)的表达。
     4.千金藤素低浓度、长时间作用降低肿瘤恶性程度,千金藤素4μM长时间处理SMMC7721细胞株。经过50代的处理,克隆形成率逐渐降低,细胞倍增时间逐渐增加。
     结论:千金藤素能够剂量依赖性地抑制小鼠移植实体瘤的生长,延长荷瘤小鼠的生存时间,与化疗药物环磷酰胺联用,具有一定的增效减毒作用。千金藤素抑制肿瘤生长和肿瘤细胞凋亡的作用机制与其抑制肿瘤细胞降解基底膜、增强免疫力、降低细胞恶性程度等紧密相关。千金藤素有望研究开发成为一种新型的抗肿瘤药物。
Objective: Cancer is one of the diseases that mostly harmful to human health in theworld. The main means of cancer treatment is surgical resection, radiotherapy orchemotherapy. Surgical resection or radiotherapy is more successful for the early tumorpatients with no invasion and metastasis, but it is not ideal for patients with late tumors;Moreover, radiotherapy and chemotherapy also have a certain impact on the exuberantproliferation of normal cells while killing cancer cells, as a result, in vomiting, diarrhea,hair loss and bone marrow suppression and other adverse reactions, it seriouslyinfluenced the patients' life quality. In this study, effect of cepharanthine joint applicationwith chemotherapy drugs on inhibition of tumor were studied, and the possiblemechanism of cepharanthine raising organism immunity, inducing apoptosis of tumorcell and preventing invasion of tumor cell were approached in vivo and in vitro.
     Methods: The effects of cepharanthine on inhibition of tumor growth was studied byoral administration cepharanthine; It was identified whether cepharanthine has thesynergies on chemotherapy drug through the inhibit-tumor experiment of cepharanthinejoint application with chemotherapy drugs; The general pharmacology indicators ofcepharanthine on chemotherapy bearing-tumor mice was identified by detecting the levelof WBC, erythrocyte, serum ALT and BUN, etc. and the number of bone marrow cells; Itwas identified whether cepharanthine has synergistic effects on immune system throughanalyzing the effect of cepharanthine on spleen index, thymus index and the impact ofleukocyte DNA; Then, the effect of cepharanthine on invasion process in vitro of humanHT1080 fibrosarcoma cells was observed through adhesion analysis assay, scarificationassay, artificial reconstruction of the basement membrane experiment gelatinase spectrumanalysis, Western blotting and so on in vitro; Induction of cepharanthine on tumor-cellapoptosis was detected using acridine orange staining and flow cytometry; Impact ofcepharanthine on the malignancy extent of tumor cells was detected applyingcolony-forming.
     Results: The results show that: 1. Cepharanthine could dose-dependently inhibit thegrowth of transplanted solid tumors of mice, significantly extended life span ofbearing-tumor (S180), intraperitoneal injection of cepharatnhine (20 mg / kg body weight)could make inhibitory rate of U14 tumor weight reach 30.8% (P<0.01); and inhibitoryrate of B16-F10 tumor weight reach 35.8% (P<0.01). Compared with model group, lifespan of mice was extended at 42.6% (P<0.01). When cepharanthine and CTX-jointapplied, antitumor activity was significantly increased (p<0.01). Medium and high dosecepharanthine and CTX-joint application tumor inhibition rates (44.9% and 62.5 %) ishigher than that of CTX group (p<0.05, p<0.01); Medium and high dose cepharanthinecombined with CTX comparison to single CTX group, the peripheral red blood cells inmice could significantly increased (P<0.01), 3.7% and 8.3% respectively. The peripheralhemoglobin in mice could significantly increased (P<0.01), 7.3% and 9.1% respectively.Cepharanthine combined with CTX comparison to the normal group, the descentamplitude of white blood cells were less, but the difference was significant comparison toCTX group (P<0.01); The mice spleen lymphocyte transformation rate were significantly(P<0.01) increased compared with CTX group after cepharanthine combined with CTX,U14 tumor cell lines inoculation of mice, spleen index and thymus index oftumor-beating mice were significantly increased after cepharanthine combined with CTX(P<0.01).Cepharanthine could dose-dependently prevent DNA damage induced bycyclophosphamide. The results indicated that cepharanthine has some attenuationsynergistic effect on anti-tumor of CTX.
     2. Cepharanthine could concentration-dependently inhibit tumor cell proliferation (2~40μM) to people fibrosarcoma cells HT-1080, hepatoma carcinoma cell SMMC7721, Helacells and so on. IC50 values of drugs on the tumor cells were 12.37±1.64μM, 12.58±1.05μM, 11.83±1.33μM respectively (treated for 48 hr); Moreover cepharanthinecould induce apoptosis of hepatoma carcinoma cell. Apoptotic cell was counted after theAO / EB stained, when SMMC7721 cells were dealed with 4μM cepharanthine for 48hours, the apoptosis rate can reach 24.7% (P<0.01).
     3. Cepharanthine could inhibit tumor cell invasion and migration. Compared with thecontrol group, 4μM drug pretreatment 48 hours later, the invasiveness of HT1080 cellswas significantly decreased (p<0.01). Moreover cepharanthine could dose-dependently inhibit the adhesion of tumor cell and basement membrane remarkably, weaken the motorability and invasiveness of tumor cell, reduce activity and expression quantity of MMP-2,up-regulate the expression of TIMP-2.
     4. Cepharanthine could lower malignancy extent with low concentration and longprocessing time, SMMC7721 cells was treated using cepharanthine 4μM for a long time,after treatment of 50 generations, the colony formation rate was decreased gradually, andcell doubling time was increased gradually.
     Conclusion: Cepharanthine could dose-dependently inhibit the growth of transplantedsolid tumors of mice, extended life span of bearing-tumor. It could play a certain synergiaand attenuation when combined with the chemotherapy drug cyclophosphamide. Themechanisms of cepharanthine inhibition tumor growth and tumor apoptosis is closelyrelated to its effect of inhibition tumor cell degradation basement membrane.Cepharanthine is expected to study and develop as a new type of anticancer drug.
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