摘要：
目的 研究新型一氧化氮(NO)供体O2-(2,4-二硝基苯基)1-〔(4-乙氧羰基)哌嗪-1-yl〕偶氮-1-鎓-1,2-二醇(JS-K)对H22荷瘤小鼠肿瘤能量代谢的调节作用.方法 BALB/c小鼠皮下接种H22细胞建立荷瘤小鼠模型,并随机分为模型组、氟尿嘧啶(5-FU)组、JS-K 0.75和1.50 mg·kg-1组.JS-K组和模型组小鼠每3 d尾静脉注射不同剂量JS-K或生理盐水,连续14 d(共给药5次);5-FU组每天1次ip给予5-FU 20 mg·kg-1.给药后第15天将小鼠处死,分离胸腺、脾和完整瘤体,并称取其质量,计算抑瘤率和脏器系数.比色法检测瘤组织中己糖激酶(HK)、丙酮酸激酶(PK)、磷酸果糖激酶(PFK)、琥珀酸脱氢酶(SDH)和腺苷三磷酸酶(ATPase)活性,以及乳酸和ATP水平;Western蛋白印迹法检测各组瘤组织中缺氧诱导因子-1α(HIF-1α)和己糖激酶Ⅱ(HKⅡ)蛋白表达.结果 与模型组比较,JS-K 0.75和1.50 mg·kg-1组瘤质量显著下降(P<0.01),抑瘤率分别为23.9%和50.3%.JS-K 0.75和1.50 mg·kg-1组小鼠胸腺系数和脾系数与模型组无明显差异.比色法检测结果显示,JS-K 1.50 mg·kg-1组瘤组织中HK,PFK,SDH,PK和ATPase活性较模型组的〔22.6±3.7,14.4±2.6,(10.5±2.6)U·g-1蛋白,(12.9±3.2)kU·g-1蛋白和(0.70±0.10)mmolPi·g-1蛋白·h-1〕分别下降了42.0%,26.6%,23.3%,22.7%和21.7%(P<0.01,P<0.05);JS-K 1.50 mg·kg-1组瘤组织中ATP水平较模型组下降16.6%(P<0.01);JS-K 0.75和1.50 mg·kg-1组瘤组织中乳酸水平较模型组分别下降38.7%和59.4%(P<0.01).Western蛋白印迹检测结果显示,与模型组比较,JS-K 1.50 mg·kg-1组瘤组织中HIF-1α蛋白表达显著降低(P<0.01);JS-K 0.75和1.50 mg·kg-1组HKⅡ蛋白表达均显著降低(P<0.05,P<0.01).结论 JS-K能抑制H22荷瘤小鼠肿瘤生长,其机制可能与抑制糖酵解和有氧氧化途径从而调节肿瘤能量代谢有关.%OBJECTIVE To investigate the regulation of{O2 (2,4-dinitrophenyl)1-[(4-ethoxycarbonyl) piperazin-1-yl] diazen-1-ium-1, 2-diolate} (JS-K), a nitric oxide donor, on tumor energy metabolism in H22 tumor-bearing mice. METHODS The hepatoma animal model in BALB/c mice was established with H22 cell line. The inoculated mice were randomly divided into four groups. The JS-K group and model group received JS-K (0.75 and 1.50 mg?kg-1) and saline via tail the vein intravenously once every 3 d for 14 d, and 5 injections, respectively. The fluorouracil (5-FU) group received 5-FU 20 mg·kg-1 by intra-peritoneal injection once a day for 14 d. On the 15th day after the first administration, mice were sacri-ficed and the tumor, thymus and spleen were isolated and weighed immediately. The tumor growth inhibitory rate and organ index were calculated. The activities of hexokinase (HK), phosphofructokinase (PFK), pyruvate kinase (PK), succinate dehydrogenase (SDH), adenosinetriphosphatase (ATPase), and the levels of lactic acid (LD) and adenosine triphosphate (ATP) in tumor tissues were determined by colorimetric method. The expression of hypoxia-inducible factor 1 alpha (HIF-1α) and hexokinaseⅡ(HKⅡ) in the tumor tissue was analyzed by Western blotting. RESULTS Compared with model group, the tumor mass of JS-K 0.75 and 1.50 mg · kg-1 groups was significantly reduced (P<0.01), and the tumor growth inhibitory rate was 23.9%and 50.3%, respectively. There was no diffrence in thymic and splenic indexes between JS-K group and model group. The activity of HK, PFK, SDH, PK and ATPase of tumor tissue in model group was 22.6±3.7, 14.4±2.6, (10.5±2.6) U·g-1protein, (12.9±3.2) kU·g-1 protein and (0.70 ± 0.10) mmolPi · g-1protein · h-1, respectively, which dropped by 42.0%, 26.6%, 22.7%, 23.3%and 21.7%respectively (P<0.01, P<0.05) in JS-K 1.50 mg?kg-1 group. Compared with the model group, the level of ATP of tumor tissue in JS-K 1.50 mg?kg-1 groups dropped by 16.6%(P<0.01) and the level of LD in JS-K 0.75 and 1.50 mg?kg-1 groups dropped by 38.7%and 59.4%(P<0.01), respectively. In addi-tion, the expression of HIF-1αof tumor tissue in JS-K 1.50 mg?kg-1 group was decreased (P<0.01), and the expression of HKⅡ of tumor tissue in JS-K 0.75 and 1.50 mg?kg-1 groups was decreased signifi-cantly (P<0.05, P<0.01). CONCLUSION JS-K can inhibit the growth of tumor in H22 tumor-bearing mice and its mechanism may be related to regulating the tumor energy metabolism by inhibiting glycolysis and aerobic oxidation.
