肿瘤防治研究  2018, Vol. 45 Issue (6): 420-424
本刊由国家卫生和计划生育委员会主管,湖北省卫生厅、中国抗癌协会、湖北省肿瘤医院主办。
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文章信息

藻蓝蛋白抗肿瘤的应用现状
Application Status of C-phycocyanin in Anti-tumor
肿瘤防治研究, 2018, 45(6): 420-424
Cancer Research on Prevention and Treatment, 2018, 45(6): 420-424
http://www.zlfzyj.com/CN/10.3971/j.issn.1000-8578.2018.17.1464
收稿日期: 2017-11-20
修回日期: 2017-12-25
藻蓝蛋白抗肿瘤的应用现状
刘慧慧, 姜良乾, 王玉娟, 刘国祥, 姬欢欢, 任俊逸, 李冰     
266021 青岛,青岛大学医学部生物教研室
摘要: 近年来,在海洋生物中寻找高效、低毒、不良反应小的抗肿瘤药物已引起了国内外学者的重视。藻蓝蛋白(C-phycocyanin, C-PC)对多种肿瘤细胞具有毒副作用,可以抑制肿瘤细胞的生长,促进肿瘤细胞的凋亡。联合其他药物可以提高藻蓝蛋白的抗肿瘤活性。现对藻蓝蛋白抗肿瘤作用的研究进展进行总结,为新型天然药物的研发提供依据。
关键词: 藻蓝蛋白     联合     抗肿瘤     肿瘤细胞    
Application Status of C-phycocyanin in Anti-tumor
LIU Huihui, JIANG Liangqian, WANG Yujuan, LIU Guoxiang, JI Huanhuan, REN Junyi, LI Bing     
Department of Cell Biology, Basic Medical College, Qingdao University, Qingdao 266021, China
Corresponding author: LI Bing, E-mail: libing_516619@163.com.
Abstract: In recent years, the search for anti-tumor drugs with high efficiency, low toxicity and little side effects in marine organisms has attracted the attention of scholars. C-phycocyanin (C-PC) has toxic and side effects on a variety of tumor cells, which can inhibit the growth of tumor cells and promote the apoptosis of tumor cells. Phycocyanin combined with other drugs can improve its anti-tumor activity. This review discusses the therapeutic use of phycocyanin and focuses on the latest advances of phycocyanin as a promising natural anti-cancer drug.
Key words: C-phycocyanin     Union     Anti-tumor     Tumor cells    
0 引言

近年来,海洋产品已被证实具有很好的抗癌活性,并且几乎无毒副作用[1]。藻蓝蛋白(C-phycocyanin, C-PC)是一种从螺旋藻[2]、鞘丝藻[3]、集胞藻[4]等藻类中提取的生物活性营养化合物[5-6],其营养丰富,可以补充人体蛋白质和维生素[7]。藻蓝蛋白属于藻胆蛋白(PBP)家族[8],主要由α亚基和β亚基组成[9]

研究表明,藻蓝蛋白在抗肿瘤中发挥重要的作用[10-11],且具有广泛的医药价值[12]、抗肿瘤[13]、抗氧化功效[14],还具有抗炎活性[15],是潜在的天然抗炎剂[8, 16]。藻蓝蛋白也可以清除受损的神经细胞自由基,避免DNA氧化损伤[17],从而防止自由基引起的神经细胞凋亡[18-19]。藻蓝蛋白还可以抑制上皮-间质转化(EMT)[20]。此外,藻蓝蛋白还具有光诱导细胞毒性[21]和免疫刺激作用[22],促进动物血细胞的再生、提高淋巴细胞活性、提高机体的免疫功能[23-24],全面提高机体的抗病能力[25],具有药物开发潜力[26]。大量研究表明,藻蓝蛋白对多种肿瘤具有抑制作用,如乳腺癌[10]、肝癌[27]等。

1 藻蓝蛋白单独作用

藻蓝蛋白是存在于藻类细胞中的光合辅助色素蛋白,并且具有显著的抗肿瘤活性。Ying等[28]将藻蓝蛋白作用于卵巢癌(SKOV-3)细胞,发现细胞阻滞于G2/M期,表明藻蓝蛋白能够抑制卵巢癌细胞的增殖。Liao等[29]将藻蓝蛋白作用于胰腺癌(PDA)细胞,发现随着藻蓝蛋白浓度的增加,细胞活性逐渐减弱,流式细胞仪检测发现藻蓝蛋白能够将细胞周期阻滞于G2/M期。藻蓝蛋白作用于胰腺癌小鼠模型,随藻蓝蛋白浓度的增加,小鼠瘤块组织逐渐减小。应俊等[30]将不同浓度的藻蓝蛋白处理喉癌HEP-2细胞。MTT结果显示藻蓝蛋白能够抑制喉癌HEP-2的细胞活力,且呈时间和剂量依赖性;流式细胞术实验证实藻蓝蛋白可显著诱导HEP-2细胞的凋亡;藻蓝蛋白处理后细胞内活性氧(ROS)含量增加,caspase-3、-8、-9被激活;实时定量PCR(RT-PCR)结果表明,藻蓝蛋白作用后促凋亡蛋白Bax、Fas、P53、caspase-3和caspase-9的表达显著上调,抗凋亡蛋白Bcl-2表达显著下调;从而使凋亡细胞的bcl-2/bax比率下降、诱导细胞的凋亡。李冰等[31-32]构建得到含有CD59基因的HeLa细胞,以不同剂量的藻蓝蛋白作用于体外培养的HeLa细胞,通过MTT法检测发现藻蓝蛋白能抑制HeLa细胞的增殖并存在浓度剂量效应;采用流式细胞仪检测藻蓝蛋白对HeLa细胞的细胞周期变化及细胞凋亡的影响,结果表明,经藻蓝蛋白处理后细胞抗凋亡蛋白Bcl-2下调,但是促凋亡蛋白Bax上调或没有任何变化,因此,Bcl-2/Bax的比率倾向于引起细胞凋亡。

上述文献对藻蓝蛋白的抗肿瘤作用和机制进行了研究,为下一步研究奠定了基础。

2 藻蓝蛋白联合光动力疗法

Morcos等[33]发现激光诱导藻蓝蛋白能够对细胞产生毒性,当He-Ne激光联合应用于肿瘤细胞时,藻蓝蛋白可以作为光敏化剂在光动力治疗中发挥重要作用。Li等发现,藻蓝蛋白联合光动力疗法(PDT)能促进荷MCF-7瘤小鼠体内癌细胞凋亡,为肿瘤的治疗提供了新的方向[22]。藻蓝蛋白作为光敏剂,在625 nm激光照射下,藻蓝蛋白诱导活性氧(ROS)产生细胞毒性反应,诱导MDA-MB-231细胞凋亡[34]

当藻蓝蛋白联合He-Ne激光对肝癌细胞HepG2进行治疗时,藻蓝蛋白可作为光敏剂诱导线粒体膜电位降低,增加活性氧(ROS)的含量,释放细胞色素C,促进Caspase-3蛋白的表达,引起细胞周期阻滞,激发HepG2细胞激活内源性途径启动细胞凋亡,而对健康者肝细胞系HL7702细胞没有任何毒副作用[21]

李冰等[35]将HeLa细胞荷瘤小鼠局部皮下注射藻蓝蛋白液,经氦氖激光照射后,产生一种具有毒性作用的活性态氧离子,从而破坏肿瘤细胞。激光能够增强NK细胞的活性及T细胞的增殖活性,表明激光照射具有抗肿瘤及提高免疫细胞活性的作用。而C-PC和激光联合作用后,抗肿瘤免疫效应明显增强。激光照射肿瘤细胞区,可促进肿瘤死亡信号的传递,并提高荷瘤机体的抗肿瘤免疫力。

3 藻蓝蛋白联合全反式维甲酸

全反式维甲酸(ATRA)对肿瘤细胞的生长有抑制作用[36]。然而由于高浓度ATRA的毒副作用较大,使得该药物的临床使用受到很大的限制[37]。目前,联合用药是临床上治疗肿瘤的重要策略之一,其治疗原则是减少耐药性的产生,减轻患者的不良反应,延长用药时间从而提高疗效。李冰[38]将C-PC和ATRA联合用药,探寻两种药物的最佳作用浓度。体内采用MTT检测两种药物单独及联合使用时HeLa和A549细胞的增殖情况。体外利用NU/NU裸鼠构建荷瘤小鼠模型,经C-PC和ATRA药物处理后,用MTT法检测T淋巴细胞和脾脏细胞的活性。结果表明,两种药物单独使用均具有肿瘤抑制效果,且抑制率随着药物浓度的升高而增加。C-PC能够增强机体免疫力,当C-PC和ATRA联合用药时,能够有效降低ATRA的毒副作用且抑瘤效果更加显著。

Yang等[39]发现全反式维甲酸和藻蓝蛋白对HeLa细胞联合治疗能显著降低全反式维甲酸的剂量和毒副作用。联合用药可显著下调抗凋亡蛋白Bcl-2的表达,上调促凋亡蛋白Caspase-3的表达,抑制细胞周期相关蛋白CDK-4和cyclin D1蛋白的表达,抑制补体调节蛋白CD59的表达和诱导细胞凋亡。

Li等[40]将A549细胞分为对照组、C-PC组、ATRA组、C-PC联合ATRA组,培养24 h后用MTT比色法检测A549细胞的生长情况。结果显示C-PC和ATRA都能抑制A549的生长,并与剂量呈正相关,两者联合时,抑制作用明显加强。

藻蓝蛋白联合全反式维甲酸抗肿瘤的效果明显增强,C-PC和ATRA两者都能抑制肿瘤细胞的生长,两者联合能降低ATRA的浓度,减少毒副作用,延长用药时间,增加了C-PC抗肿瘤的能力。

4 藻蓝蛋白联合其他药物

Gantar[41]用10%常规剂量的拓扑替康和藻蓝蛋白联合作用治疗前列腺癌(LNCaP),结果表明,两者联合用药的效果远远高于两者单独作用。藻蓝蛋白和拓扑替康联合使用激活了Caspase-9和Caspase-3的表达活性,增加了氧自由基(ROS)的表达水平,诱导肿瘤细胞的凋亡,并且降低了拓扑替康单独使用时的副作用。

Saini等[42]用吡罗昔康(传统的非甾体类抗炎药)和藻蓝蛋白联合用药治疗DMH诱导的大鼠结肠癌,结果表明,联合用药使DNA片段化,环氧合酶-2(COX-2)及前列腺素E2(PGE2)的表达水平明显降低。此外,肿瘤细胞的数量和体积也明显减少。

Bingula等[43]对肺癌A549细胞联合甜菜碱和藻蓝蛋白用药时,A549细胞的活力下降了60%,远远高于甜菜碱或藻蓝蛋白单独使用时的细胞活力。甜菜碱和藻蓝蛋白的联合用药降低了NF-κB的表达,增加了促凋亡蛋白p38的表达,引起细胞G2/M细胞周期阻滞。

阿霉素联合藻蓝蛋白作用于成年大鼠,结果表明,阿霉素能显著降低活性氧(ROS)的形成并减少DNA的片段化,其细胞凋亡率明显降低。因此,藻蓝蛋白能降低阿霉素引起的氧化应激与心肌细胞凋亡[44]

5 新型藻蓝蛋白/羧甲基壳聚糖-CD59配体肽纳米微球靶向作用

Li等[45-46]发现藻蓝蛋白具有抗肿瘤和提高机体免疫力的功效,但其稳定性较差、在体内易降解,限制了它在生物医学领域的应用。吕丛仪[47]利用羧甲基壳聚糖(CMC)包埋水溶性藻蓝蛋白,通过CaCl2介导的离子交联法制备藻蓝蛋白/羧甲基壳聚糖纳米微球(C-PC/CMC-NPs)。利用流式细胞术检测加药前后HeLa细胞的凋亡状况,发现C-PC、CMC和C-PC/CMC-NPs均可以诱导细胞发生凋亡,其中C-PC/CMC-NPs的凋亡效果更为明显。进一步实验表明C-PC、CMC和C-PC/CMC-NPs均可以抑制抗凋亡蛋白Bcl-2的表达,促进促凋亡蛋白JNK和Caspase-3的表达,其中C-PC/CMC-NPs的作用效果最为明显。C-PC/CMC-NPs诱导HeLa细胞发生凋亡的分子机制可能是通过抑制Bcl-2蛋白的表达,促进JNK蛋白和Caspase-3蛋白的表达,从而实现凋亡信号在JNK信号转导通路中的传递,诱导肿瘤细胞发生凋亡。

殷启风等[48]以C-PC为抗肿瘤的模式药物,CMC为载体,CD59配体肽(CD59sp)为靶向分子,将C-PC包裹在CMC中,制备出C-PC/CMC-NPs,再将CD59sp连接到纳米微球上,合成靶向纳米药物C-PC/CMC-CD59sp-NPs,实现纳米微球的靶向输送,并对靶向纳米药物在肿瘤细胞的靶向性、安全性、抗肿瘤效果进行研究。将CD59sp连接到纳米微球上,制备出靶向纳米药物,旨在利用CD59配体肽和肿瘤细胞表面的CD59蛋白的特异性结合,在CD59sp的引导下实现药物的靶向停靠和摄入。在CD59sp的引导作用下,C-PC/CMC-CD59sp-NPs能靶向高效抵达HeLa细胞表面,并对HeLa细胞增殖有明显抑制作用。该微球可促进Caspase-3和PARP蛋白的表达,抑制Bcl-2蛋白的表达,促进凋亡信号在胞内的转导,同时发现该纳米微球能明显抑制细胞周期的进程,出现G1期阻滞现象。Wang等[49]发现新型C-PC/CMC-CD59sp纳米微球能促进肿瘤细胞的凋亡、抑制肿瘤细胞的增殖。

新型C-PC/CMC-CD59sp-NPs纳米微球以C-PC为抗肿瘤的模式药物,CMC为载体,CD59sp为靶向分子进行肿瘤靶向治疗。该纳米微球可以显著减少C-PC的降解,增加C-PC的稳定性,改变药物的溶出率,提高药物的利用率,能够长时间保持药物的有效浓度,从而提高药物的疗效、降低毒副作用。利用CD59sp特异性与CD59结合,既可作为靶向引导分子连接在纳米药物上,实现靶向给药,又可封闭CD59,促进MAC的形成,增强抗肿瘤效果。

6 结论

藻蓝蛋白用途广泛,具有明显抑制肿瘤生长的作用,无毒、高效,但其含量较低、稳定性差,在体内易降解、利用率低,限制了其应用。以天然藻蓝蛋白为对象进行药物开发存在着许多问题,比如成本高、杂质多、周期长等。其联合其他药物的抗肿瘤效应有待于进一步开发,其中靶向抗肿瘤载体系统的构建为药物研发提供了新思路。

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