目的：评价长春新碱长循环热敏脂质体（VTSL）的体内外抗肿瘤活性。方法采用MTT法评价长春新碱注射液（VCR）和VTSL对sw620、PANC细胞的细胞毒作用；使用香豆素-6（Cou-6）标记脂质体，Hoechst 33258细胞染色，激光共聚焦显微镜观察HT-1080细胞对长循环热敏脂质体（TSL）摄取情况；建立荷瘤裸鼠模型（HepG-2、MCF-7），给药后加热肿瘤部位30 min，测量裸鼠体质量和肿瘤体积，比较研究VTSL的抑瘤效果。结果脂质体组给药后72 h，sw620细胞活性均＜5%，PANC细胞活性均＜20%，较VCR显示出更强的细胞毒作用；Cou-6标记脂质体加热后细胞内绿色荧光增强，细胞摄取增多；同剂量下VCR和VTSL对HepG-2、MCF-7的抑瘤率分别是50.0%和69.7%，47.8%和76.1%，治疗结束后肿瘤质量存在显著性差异。结论将长春新碱制备成为VTSL提高了细胞毒性，加热能促进脂质体与细胞膜融合；在相同治疗剂量下，VTSL比VCR抑瘤率显著提升且存在一定的剂量依赖性。结果表明将长春新碱制备为VTSL应用于实体瘤治疗，能显著提高其治疗效果，有潜力拓展该药物的临床适用范围。%Objective To investigate the anti-tumor activity of long-circulation thermosensitive liposom-loaded vincristine (VTSL)in vivo and in vitro. Methods The inhibitory effects of VTSL and vincristine injection(VCR)on sw620 cell and PANC cell were detected by MTT assay. The uptake capacity of HT-1080 was studied by using Cou-6-loaded liposome. Different xenograft nude mice models of HepG-2 and MCF-7 were established. To study anti-tumor effect of VTSL,drugs were given via tail and heat therapeu⁃tic area for 30 minutes,mice weight and tumor weight were recorded. To study anti-tumor effect of VTSL,drugs were given via tail vein and heat therapeutic areas for 30 min,mice body mass and tumor mass were recorded. Results After VTSL was given 72 h,the activ⁃ity of sw620 and PANC was less than 5%and 20%,respectively. VTSL showed stronger cytotoxic effect than vincristine. At the same dose,tumor inhibitory rate of VCR and VTSL on HepG-2 and MCF-7 bearing nude mice was 50%,69.7%,47.8%and 76.1%,respec⁃tively. There were significant differences in tumor weight after treatment. Conclusion VTSL enhances the cytotoxicity by heating. Loading vincristine into TSL increased cytotoxicity,and heating could promote the fusion of liposomes and cell membrane. Under the same dosage,VTSL showed much higher tumor inhibition rate than VCR,and there was a certain dose dependence. The results show that VTSL can be used in treatment of solid tumor and has the potential to expand vincristine clinical application.
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