为探究化学修饰对三角褐指藻胞内多糖抑制宫颈癌Hela细胞增殖抑制效果的影响。该研究采用超声破壁法结合热水辅助浸提法提取三角褐指藻胞内多糖PTP（Intracellular Polysaccharide from Phaeodactylum tricornutum），对三角褐指藻胞内多糖PTP进行四种化学修饰（硫酸化修饰、磷酸化修饰、乙酰化修饰和羧甲基化修饰），对三角褐指藻胞内多糖PTP、硫酸化多糖S-PTP、磷酸化多糖P-PTP、乙酰化多糖A-PTP和羧甲基化多糖C-PTP进行抑制宫颈癌Hela细胞增殖活性研究。结果显示，得到的硫酸化多糖S-PTP取代度为0.714，S-PTP较PTP抑制宫颈癌Hela细胞增殖率最大可提高9.22%、磷酸化多糖P-PTP取代度为0.191，P-PTP较PTP抑制宫颈癌Hela细胞增殖率最大可提高4.01%、乙酰化多糖A-PTP 取代度为0.513，A-PTP较PTP抑制宫颈癌Hela细胞增殖率最大可提高13.53%，羧甲基化多糖C-PTP 取代度为0.915，C-PTP较PTP抑制宫颈癌Hela细胞增殖率最大可提高8.39%。研究结果显示，四种修饰多糖对Hela细胞增殖抑制效果较PTP均有所提升，化学修饰对Hela细胞增殖抑制提升效果最大的为乙酰化修饰，A-PTP较PTP抑制宫颈癌Hela细胞增殖率最大可提高13.53%，达到46.05%。该实验通过对三角褐指藻多糖PTP进行化学修饰，证明三角褐指藻多糖在分子结构上引入新的化学基团对抑制宫颈癌细胞增殖有着较大影响，对进一步研究三角褐指藻的生物活性提供了重要参考，为后续的药物研发提供实验基础。

In order to explore the effect of chemical modification on the inhibitory effect of intracellular polysaccharides of Phaeodactylum tricornutum (PTP) on the proliferation of cervical cancer Hela cells, in this study, the PTP was extracted by the ultrasound-assisted wall-breaking method combined with the hot water extraction method. Four types of chemical modification (sulfation modification, phosphorylation modification, acetylation modification and carboxymethylation modification) were carried out on the PTP. The inhibitory effects of the initial PTP, sulfated polysaccharide (S-PTP), phosphorylated polysaccharide (P-PTP), acetylated polysaccharide (A-PTP) and carboxymethylated polysaccharide (C-PTP) on the proliferation of cervical cancer Hela cells were studied. The results showed that the degree of substitution of the S-PTP was 0.714, and the inhibitory effect of S-PTP on the proliferation rate of Hela cells could be up to 9.22% higher than that of PTP. The degree of substitution of P-PTP was 0.191, and the inhibitory effect of P-PTP on the proliferation rate of Hela cells could be up to 4.01% higher than that of PTP. The degree of substitution of acetylated polysaccharide A-PTP was 0.513, and the inhibitory effect of P-PTP on the proliferation rate of Hela cells could be up to 13.53% higher than that of PTP. The degree of substitution of C-PTP was 0.915, and the inhibitory effect of C-PTP on the proliferation rate of Hela cells could be up to 8.39% higher than that of PTP. The results showed that the inhibitory effects of four modified polysaccharides on the proliferation of Hela cells were all greater than that of PTP. Acetylation modification had the greatest inhibitory effect on the proliferation of Hela cells. Compared with PTP, the inhibitory effect of A-PTP against the proliferation rate of cervical cancer Hela cells was increased by 13.53%, reaching 46.05%. Through the experiments of chemical modification of PTP, it was proven that the introduction of a new chemical group into the molecular structure of PTP can lead to a great influence on the inhibition of cervical cancer cell proliferation. This result provides an important reference for further study on the biological activity of Phaeodactylum tricornutum and an experimental basis for subsequent drug research and development.

广西自然科学基金项目（2023GXNSFAA026409；2018GXNSFAA294032）