Life Sci:喜讯|浙大转化医学院闵军霞团队在天然产物抗胃癌研究领域获得重要进展

2019-01-13 佚名 营养发现

梅、兰、竹、菊,是我国传统绘画中常见的重要题材,称为“四君子”。 竹子,不仅青翠挺拔,“劲节虚心”深为国人喜爱;同时,竹子还蕴藏着造福人类健康的药物分子。

梅、兰、竹、菊,是我国传统绘画中常见的重要题材,称为“四君子”。 竹子,不仅青翠挺拔,“劲节虚心”深为国人喜爱;同时,竹子还蕴藏着造福人类健康的药物分子。

近日,浙江大学转化医学院闵军霞团队通过对16种植物多糖天然产物系统性筛选,发现来源于竹子的竹茹多糖(Bamboo Shaving Polysaccharide, BSP)对癌有显著的防治效应,其抗癌效应明显优于我们所熟知的香菇多糖。成果于1月3日在线发表在国际医学著名期刊《Life Sciences》,论文题为“Functional Characterization of A Potent Anti-tumor Polysaccharide in A Mouse Model of Gastric Cancer”。该研究成果首次揭示了竹茹多糖的抗胃癌效应及免疫调节活性,不仅丰富了竹茹多糖抗肿瘤的理论基础,而且为多糖药物治疗胃癌的临床应用提供了可靠的实验依据。



竹茹多糖抗胃癌图示摘要

胃癌是亚太地区发病率及死亡率较高的常见癌症类型。因此,针对胃癌新型药物的研发一直是肿瘤治疗领域的热点及难点。具有生物活性的植物提取多糖,如香菇多糖,因其免疫调节活性,业已成为临床辅助治疗肿瘤的免疫调节剂。随着医学科研技术和临床治疗理念的进步,以肿瘤免疫靶向治疗和肿瘤生物治疗联合传统放化疗的综合肿瘤疗法逐渐被临床所采用。这些联合疗法不仅能够有效降低传统抗肿瘤化疗药物的使用剂量,降低化疗毒副作用,而且可以提高肿瘤治疗响应率,有效抑制肿瘤发展,提高患者生活质量,延长带瘤生存期,为患者争取到手术或其他的治疗机会。

相对于临床常用的各种抗肿瘤化疗药物,植物类提取多糖具备激活免疫细胞、诱导增加抗体生成、激活细胞因子分泌以及激活补体系统等多种增强免疫系统反应性的生物学活性。在抗肿瘤方面,植物多糖的生物活性则主要表现为抑制肿瘤细胞增殖、促进细胞凋亡、抑制癌基因的表达、蛋白质的合成,以及影响肿瘤细胞表面信号分子表达、信号传递等功能。研究表明,多糖类抗肿瘤药物在医药领域正显示出越来越大的优势。

为了筛选出高效的抗肿瘤活性多糖药物,在闵军霞教授的指导下,博士研究生李广宇(第一作者)和博士后张亦然博士(共同一作)在多种人源及鼠源的胃癌、肺癌、肝癌细胞株及正常胃粘膜上皮细胞株(GES-1)、人肺支气管细胞株(BEAS-2b)和人肝细胞株(HepLL)中的天然多糖产物杀伤功能进行了系统筛选。通过比较16种多糖产物杀肿瘤细胞功能,发现竹茹多糖(BSP)能够选择性抑制胃癌细胞的生长,其机制主要是通过抑制G1/S细胞周期的转换,减少S期DNA合成(BrdU+)的胃癌细胞百分比,从而诱导胃癌细胞发生细胞周期阻滞于G1期。



体外生物活性多糖筛选发现BSP选择性抑制胃癌细胞增殖

为了进一步研究BSP的体内抗肿瘤活性,研究团队构建了Syngeneic胃癌荷瘤小鼠模型及MNK-BALB/c裸鼠模型。研究发现:BSP能够有效抑制肿瘤组织生长,并显著延长荷瘤小鼠的生存时间,其体内活性主要是通过诱导肿瘤细胞凋亡、增加肿瘤淋巴细胞浸润,以及下调肿瘤相关巨噬细胞(TAM)等综合效应机制发挥抗肿瘤效应。



BSP体内抗肿瘤效应及延长小鼠生存时间

该研究通过大量体内及外实验,揭示了BSP多糖的有效抗胃癌活性,为进一步的胃癌临床实验提供了实验依据,通过研究探索竹茹多糖这种尚未开发的自然资源,能够拓展具有药用价值的新型抗肿瘤多糖药物。

该成果已获得国家发明专利授权,专利证书如下:



竹茹,为中药名。取新鲜竹茎,除去外皮,将稍带绿色的中间层刮成丝条,或削成薄片,捆扎成束,阴干。中医药认为竹茹具有清热化痰,除烦,止呕功效。以竹茹为原料,通过特殊工艺可提纯获得竹茹多糖。本研究中竹茹多糖由浙江大学食品科学学院张英教授团队提供。

论文共同第一作者为博士研究生李广宇和博士后张亦然;浙江大学转化医学研究院闵军霞教授为通讯作者。浙江大学食品科学学院张英教授及医学院/公共卫生学院王福俤教授参与部分研究。本研究得到国家自然科学基金委及浙江省自然科学基金委的科研经费资助。

原始出处:
Guangyu Li, YiranZhang, Enjun Xie, et al. Functional characterization of a potent anti-tumor polysaccharide in a mouse model of gastric cancer. Life Sciences. Jan 3, 2019.

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    2019-07-20 clmlylxy
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    2019-03-04 jyzxjiangqin

    浙大转化医学院招收入联合。

    0

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    2019-02-10 jyzxjiangqin

    浙江大学转化医学。

    0

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    2019-02-02 jyzxjiangqin

    浙大转化医学院。

    0

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    2019-01-22 jyzxjiangqin

    天然产物抗胃癌研究。

    0

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