香菇多糖增强树突状细胞瘤苗的抗肿瘤作用及其机制研究

目的 进一步提高树突状细胞（DC）瘤苗的抗肿瘤作用，探索有效的抗肿瘤生物疗法。方法 以腺病毒为载体介导黑色素瘤抗原（gp100）转染至DC制备成DC瘤苗，研究不同剂量香菇多糖（lentinan，LNT）单独或联合gp100-DC瘤苗对荷瘤小鼠的免疫治疗作用及其相关机制。结果 LNT联合gp100-DC瘤苗能有效抑制恶性黑色素瘤生长，无瘤生存率达到66．7％。LNT联合gP100-DC瘤苗治疗后，能显著增强荷瘤小鼠的细胞毒性T淋巴细胞（CTL）和自然杀伤（NK）细胞活性，提高脾细胞的干扰素-γ（IFN-γ）和IL-2分泌水平，组织学检查发现瘤体及瘤周有大量炎性细胞浸润，肿瘤细胞发生明显坏死。结论 LNT联合gp100-DC瘤苗能有效地增强DC瘤苗的抗肿瘤免疫反应。

Study on Effect of Lentinan in Enhancing Anti-tumor Action of Dendritic Cytoma Vaccine and Its Mechanism

OBJECTIVE: To improve the anti-tumor effect of dendritic cytoma vaccine (DCV) for finding an effective anti-tumor biotherapy. METHODS: DC vaccine prepared by transfection of adenovirus mediated melanoma-associated antigen gene (gp100) into bone marrow-derived dendritic cell (DC) was used to study the immuno-therapeutic effect and the mechanism of lentinan (LNT) in different dosages, used alone or combined with gp100-DC for treatment of B16 melanoma bearing mice. RESULTS: After being treated with LNT combining gp100-DC, the growth of malignant melanoma was inhibited with the tumor-free survival in the experimental animals being 66.7%. The treatment could also significantly enhance the activity of cytotoxicity T lymphocyte (CTL) and natural killer (NK) cells, elevate the levels of interleukin-2 (IL-2) and interferon-gamma (IFN-gamma) in splenocytes, and histological examination showed that a large amount of inflammatory cells infiltrated inside and around the tumor, and obvious necrosis of tumor cells was found. CONCLUSION: By combined use with LNT the anti-tumor immuno-reaction of DCV vaccine could be enhanced effectively.