【摘要】 背景与目的:据报道,肿瘤患者在急性感染后可出现肿瘤症状显著改善、肿瘤完全消退的现象。链球菌OK-432菌苗对多种动物肿瘤有显著抑制作用,并已试用于临床肿瘤治疗,除有发热与白细胞数升高外,无其他副作用。本研究旨在探讨三联菌苗对荷肉瘤180(S180)小鼠血清白介素12p70(IL-12p70)含量的变化及S180生长的影响,以及血清IL-12(p70)含量的变化与S180生长的关系。方法:所有实验小鼠接种S180后,按完全随机设计分成5组(即金黄色葡萄球菌菌苗组,A组、鼠伤寒沙门氏菌菌苗组,B组、草分枝杆菌菌苗组,C组、由前3种菌组成的三联菌苗组,D组、空白对照组,E组)进行实验。称重法检测各菌苗对小鼠S180的抑瘤率,ELISA法检测菌苗对S180小鼠血清IL-12(p70)的含量。结果:A、B、C组小鼠平均S180瘤重分别为1.39、1.50、1.36g,而D组小鼠的平均瘤重最低(0.62g),E组平均瘤重最高(2.40g)。各组小鼠S180重量的差异有非常显著性(F=66.73,P<0.001);A、B、C、D组的平均瘤重均比E组低,D组比A、B、C组的低,差异均有显著性(q检验,P<0.001)。胸腺、脾脏重量在各组间的差异无显著性(F=2.36,P>0.05;F=1.89,P>0.05)。A、B、C组的抑瘤率分别为42.08%、37.50%、43.33%,D组抑瘤率为74.17%。D组小鼠血清IL-12(p70)的平均含量最高(19.44pg/ml),A、B、C组IL-12(p70)的平均含量分别为11.88、10.35、11.68pg/ml,E组的最低(4.45pg/ml);各组小鼠血清IL-12(p70)含量的差异有显著性(F=15.76,P<0.0001);A、B、C组小鼠血清IL-12(p70)含量的差异无显著性(q检验,P>0.05),而其余任何两组均数比较,差异均有显著性(q检验,P<0.01)。结论:实验所选用的菌苗能诱导小鼠产生IL-12(p70)、抑制小鼠S180的增长,三联菌苗比单价菌苗的效果更好。更多还原

【Abstract】 BACKGROUND & OBJECTIVE: It was reported that the symptoms of tumor patients may be alleviated markedly and even the tumor may be regressed completely after acute infection. Bacterin OK-432 has notable inhibitory effect on the growth of various tumors in animals. At present, OK-432 has been used in clinical immunotherapy for tumors with no other adverse events besides of fever and leucocytosis. This study was to investigate the effects of combined bacterin on the serum level of interleukin 12(p70)[IL-12(p70)] and the growth of sarcoma 180 (S180) in mice. METHODS: After transplantation of S180, the mice were randomized into 5 groups, and received injection of Staphylococcus aureus, Salmonella typhimurium, Mycobactoria phlei, and combined bacterin containing the 3 bacteria strains, respectively, or received no treatment (blank control). The weight of S180 xenografts, the thymus, and the spleen in mice was measured. The serum level of IL-12(p70) was detected by ELISA. RESULTS: The mean weight of S180 tumors was 1.39 g in Staphylococcus aureus group, 1.50 g in Salmonella typhimurium group, 1.36 g in Mycobactoria phlei group, 0.62 g in combined bacterin group, and 2.40 g in blank control group; the differences among the 5 groups were significant (F=66.73, P<0.001). The mean weight of S180 tumors was significantly lower in the 4 bacterin groups than in control group, and significantly lower in combined bacterin group than in the 3 single bacterin groups (q test, P<0.001). The weights of the thymus and the spleen among the 5 groups had no significant difference (F=2.36, P>0.05; F=1.89, P>0.05). The inhibition rate of tumor growth was significantly higher in combined bacterin group than in Staphylococcus aureus, Salmonella typhimurium, and Mycobactoria phlei groups (74.17% vs. 42.08%, 37.50%, and 43.33%, P<0.01). The mean serum level of IL-12(p70) was 19.44 pg/ml in combined bacterin group, 12.41 pg/ml in Staphylococcus aureus group, 10.35 pg/ml in Salmonella typhimurium group, 11.68 pg/ml in Mycobactoria phlei group, and 4.45 pg/ml in control group; the difference among the 5 groups was significant (F=15.76, P<0.0001), but the difference among the 3 single bacterin groups was not significant (q test, P>0.05), while the differences between other groups were significant (q test, P<0.01). CONCLUSIONS: The chosen bacterins in this study can induce the mice to produce IL-12(p70) and suppress the growth of S180. The effect of the combined bacterin is much better than the single bacterins.更多还原