中药自拟方对慢性萎缩性胃炎癌前病变模型大鼠胃黏膜组织中c-myc、caspase-3表达的影响

目的：研究中药自拟方对慢性萎缩性胃炎癌前病变模型大鼠胃黏膜组织中原癌基因c-myc、半胱氨酸天冬氨酸蛋白酶-3(cysteinyl aspartate specific proteinase-3, caspase-3)表达的影响。方法将120只Wistar大鼠按随机数字表法分为正常组，模型组，自拟方大、中、小剂量组及胃复春组，每组20只。除正常组外，其余各组大鼠制备慢性萎缩性胃炎癌前病变大鼠模型。造模成功后，自拟方大、中、小剂量组分别灌胃生药含量为2.088、1.044、0.522 g/ml的自拟汤药，胃复春组灌胃胃复春混悬液0.076 g/ml，给药量1 ml/100g大鼠；正常组、模型组灌胃等体积生理盐水。1次/d，连续给药12周。采用免疫组化染色法检测大鼠胃黏膜中原癌基因 c-myc、caspase-3的表达。结果与模型组比较，自拟方大、中剂量组与胃复春组c-myc(30.25±3.56)%、(45.37±4.81)%、(38.79±4.02)%比(63.45±7.08)%]表达降低(P＜0.01或P＜0.05)，caspase-3(36.85±5.02)%、(31.24±4.55)%、(31.57±4.62)%比(23.43±2.95)%]表达升高(P＜0.01或P＜0.05)。结论中药自拟方可抑制慢性萎缩性胃炎癌前病变大鼠胃黏膜中c-myc的表达，激活caspase-3，增加慢性萎缩性胃炎癌前病变的细胞凋亡。

Effects of self-designed Chinese medicine decoction on the expression of c-myc and ;caspase-3 in the rats with precancerous lesion of chronic atrophic gastritis

Objective To investigate the effects of self-designed Chinese medicine decoction on the expression of c-myc, caspase-3 in the rats with precancerous lesion of chronic atrophic gastritis. Methods The 120 Wistar rats were randomly divided into the normal group, the model group, the Weifuchun group and the high-, medium-and low-dose decoction groups, with 20 rats each group. Except the normal group, the rats in the other groups were prepared for chronic atrophic gastritis precancerous lesion model. After establishing the models successfully, the rats of the high-, medium-and low-dose groups were given decoction via intragastric administration which contained crude drug 2.088, 1.044, 0.522 g/ml respectively, and the Weifuchun group was given drug liquid of Weifuchun with the concentration of 0.076 g/ml. The normal group and the model group were given the equal volume of normal saline. Medicines were given once a day for 12 weeks. Then the expression of c-myc and caspase-3 in the gastric mucosa of rats were detected by using immunohistochemical staining. Results Compared to the model group, the expression of c-myc in the high-, medium-dose decoction groups and the Weifuchun group (30.25%± 3.56 %, 45.37% ± 4.81%, 38.79%± 4.02% vs. 63.45% ± 7.08%) significantly decreased (P<0.01 or P<0.05);and the expression of caspase-3 (36.85%± 5.02%, 31.24%± 4.55%, 31.57%± 4.62%vs. 23.43%± 2.95%) significantly increased (P<0.01 or P<0.05). Conclusions Self-designed Chinese medicine decoction could inhibit the expression of c-myc, and activate caspase-3 expression,which may be one of the mechanisms of treating the disease.