培美曲塞脂质体的制备及其对乳腺癌的作用观察
Preparation of liposomal pemetrexed and its effects on breast cancer

目的 ·制备培美曲塞脂质体，观察其对乳腺癌细胞MCF-7及荷瘤裸鼠模型肿瘤的抑制作用。方法 ·采用薄膜分散法制作脂质体，CCK-8法检测其对MCF-7细胞的抑制作用；建立Balb/c裸鼠荷瘤模型，通过尾静脉给药以检测其抑瘤作用。结果 ·培美曲塞脂质体可抑制MCF-7细胞增殖，当培美曲塞浓度分别为0.20、0.40和10.00 μg/mL时，实验组（培美曲塞脂质体）的细胞生存率显著小于对照组（等浓度梯度培美曲塞），P值分别为0.013、0.035和0.041。与空白组（等剂量PBS）比较，实验组（培美曲塞脂质体）和对照组（等剂量培美曲塞）Balb/c裸鼠肿瘤的体积和质量均显著减小；实验组肿瘤的体积和质量也均显著小于对照组（均P=0.000）。结论 ·相对于培美曲塞原料药物，脂质体能抑制MCF-7细胞的增殖，通过尾静脉给药能有效抑制肿瘤在Balb/c裸鼠体内的生长。
： Objective · To prepare the liposomal pemetrexed and investigate its effects on MCF-7 breast cancer cells in vitro and nude mice bearing MCF-7 xenograft tumors. Methods · Liposomal pemetrexed was prepared by film dispersion method. Inhibition of MCF-7 breast cancer cell lines was evaluated by CCK-8 method, and anti-tumor effects were investigated on Balb/c nude mice bearing MCF-7 xenograft tumors. Results · Liposomal pemetrexed inhibited the growth of MCF-7 cells. When the concentrations of pemetrexed were 0.20, 0.40 and 10.00 μg/mL, the cell viability in experiment group (liposomal pemetrexed) was significantly lower than that in control group (pemetrexed of same concentration gradient), with P values of 0.013, 0.035 and 0.041, respectively. Compared with blank group (same volume of PBS), the volumes and weights of tumors of nude mice in experiment group(liposomal pemetrexed) and control group (same volume of pemetrexed) were significantly lower, and the volume and weight of tumor in experiment group were also significantly lower than those in control group (P=0.000). Conclusion · Compared to bulk drug of pemetrexed, liposomal pemetrexed can inhibit the growth of MCF-7 breast cancer cells and the Balb/c nude mice bearing MCF-7 xenograft tumors