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目的 研究白花蛇舌草多糖提取物(HDP)对人喉癌Hep-2细胞的抗瘤作用.方法 采用MTT测量细胞活性,流式细胞仪进行凋亡分析.Transwell培养小室进行细胞侵袭实验,Western blotting测量多糖提取物诱导凋亡和抗侵袭活性的机制.结果 HDP对喉癌细胞的抑制呈时间和浓度依赖性,浓度越高,时间越长抑制率越高.细胞周期分析发现HDP(400 μg/mL)使细胞滞留于G0/G1期,同时发现药物作用24 h后细胞凋亡率明显升高,Western blotting结果分析发现相关凋亡蛋白caspase-3,caspase-8和caspase-9表达升高,而Bcl-2表达下降.同时细胞侵袭实验还发现HDP抑制喉癌细胞的侵袭,抑制MMP-2和uPA相关蛋白的表达.结论 研究发现HDP抑制喉癌细胞的凋亡和侵袭,对恶性肿瘤的治疗有潜在的应用价值.“,”Objective The aim of this study was to explore the anti-tumor potential of a polysaccharide isolated from Hedyotis diffusa (HDP) in Hep-2 human larynx squamous carcinoma cells. Methods Cell cycle and apoptosis were analyzed by detecting changes in protein expression by flow cytometry. Apoptosis was further characterized by detecting relevant proteins by western blotting. Results HDP suppressed the proliferation of Hep-2 cells in a time-and dose-dependent manner. Cell cycle analysis revealed that exposure to HDP (400 μg /mL) caused G0 /G1 cell cycle arrest in Hep-2 cells. Moreover, flow cytometry revealed that Hep-2 cells treated with HDP for 24 h underwent apoptosis to a significantly greater extent than untreated control cells. HDP treatment promoted the expression of caspase-3, caspase-8, and caspase-9, and reduced the expression of Bcl-2. HDP also inhibited cell migration and suppressed the expression of MMP-2 and uPA. Conclusion HDP possesses suppressive effects against aggressive phenotypes of human larynx squamous carcinoma cells and may have therapeutic potential for this particular malignancy.