咖啡酸钠与丝裂霉素抗肿瘤的协同作用

目的研究咖啡酸钠(CA-Na)与化疗药物丝裂霉素(MMC)抗肿瘤的协同作用。方法用MTT方法、流式细胞法和Western Blotting方法。结果CA-Na与MMC合用对BEL-7402细胞增殖的抑制具有协同作用。MMC与CA-Na合并用药后BEL-7402细胞周期的变化与单用MMC不同。合用CA-Na后胞内Ca²⁺含量明显增加;线粒体膜电位有较大幅度的降低;合用还可协同抑制Bcl-2的蛋白表达、活化caspase-3的表达。CA-Na与MMC合用对移植性小鼠肿瘤的生长有抗肿瘤协同作用。 结论CA-Na和MMC体内外合用均具有抗肿瘤协同作用。

SYNERGISTIC ANTITUMOR EFFECT OF SODIUM CAFFEATE AND MITOMYCIN

AIM: To study the synergistic antitumor effect of sodium caffeate (sodium 3,4-dihydroxycinnamate, CA-Na) and mitomycin C (MMC). METHODS: MTT assay, Western Blotting analysis and flow cytometry were used to determine the effects of MMC alone and in combination with CA-Na on tumor cell proliferation, cell cycle progression and the expression of apoptosis-involved proteins Bcl-2 and caspase-3. Intracellular Ca2+ level and mitochondria membrane potential were also assayed. Inhibition of tumor growth was evaluated with hepatoma 22 transplanted s.c. in mice. RESULTS: Synergistic inhibition of hepatoma BEL-7402 cell proliferation was achieved by the combination of MMC and CA-Na. The combination of MMC and CA-Na caused more remarkable cell cycle perturbation in BEL-7402 cells than MMC alone. Combination of CA-Na and MMC synergistically inhibited Bcl-2 expression and enhanced caspase-3 expression of the cells. Intracellular Ca2+ level was significantly increased when the cells were treated with MMC combined with CA-Na. Mitochondria membrane potential was markedly decreased when treated with the combination. At doses of 0.5, 1.0 and 1.5 mg.kg-1, i.p., x 10, MMC inhibited the growth of hepatoma 22 by 35.9%, 62.7% and 79.1%, respectively. In combination with CA-Na, the inhibition rates of MMC increased to 62.4%, 70.5% and 88.0%, respectively. CONCLUSION: The combination of CA-Na and MMC showed synergistic effect against tumor cell proliferation in vitro and tumor growth in vivo.