小剂量环磷酰胺治愈荷膀胱癌小鼠动物模型的建立

目的]建立单一剂量环磷酰胺（cyclophosphamide,CTX）治愈荷膀胱癌小鼠的动物模型。方法]T739小鼠皮下接种小鼠可移植性膀胱移行细胞癌组织建立荷瘤小鼠模型。肿瘤接种后第7天,不同剂量的CTX单次腹腔内注射,观察荷瘤小鼠用药后体重和肿瘤结节直径的变化,找出CTX可治愈多数荷瘤小鼠的最低有效剂量。然后再取12只荷瘤T739小鼠随机分成两组,最低有效剂量的CTX单次腹腔内注射,等量生理盐水作对照,分别在治疗后第4、14天内眦静脉取血进行白细胞计数。结果]接种2 mm^3的小鼠膀胱癌肿瘤组织可使T739小鼠肿瘤进行性生长,接种后第7天肿瘤直径约为2-4 mm。15-400 mg/kg的CTX单次腹腔内注射后1周内,荷瘤小鼠肿瘤结节缩小的速率和毒性反应均与所用CTX的剂量呈正相关。CTX治疗后2月,100-200 mg/kg CTX治疗组的荷瘤小鼠全部死亡;40 mg/kg CTX治疗后20%的荷瘤小鼠存活;15 mg/kg CTX治疗组60%的荷瘤小鼠存活,与对照组比较差异具有统计学意义（P〈0.01）。15 mg/kg CTX治疗后第4天荷瘤小鼠外周血WBC为（11.36±0.30）×10^9/L,对照组为（11.14±2.14）×10^9/L,两组数据比较差异无统计学意义（P〉0.05）;治疗后第14天,治疗组小鼠WBC计数降为（8.46±0.76）×10^9/L,与CTX治疗后第4天WBC计数比较差异具有统计学意义（P〈0.05）,但与对照组（9.86±3.40）×10^9/L比较差异无统计学意义（P〉0.05）。结论]15 mg/kg CTX单次腹腔内注射后荷瘤小鼠无明显毒性反应,并可使多数荷瘤小鼠肿瘤治愈,因此,小剂量CTX治愈荷膀胱癌小鼠模型成功建立。

Experimental study on establishing mouse model of BTT739 tumor-bearing mice cured by a low dose of CTX

Objective] To establish an animal model of BTT739 mice cured by a single dose of cyclophosphamide(CTX).Methods] Mouse bladder carcinoma tissue was inoculated subcutaneously into BTT739 mice.7 days later,different doses of CTX were used intraperitoneally to treat these tumor-bearing mice.Tumor sizes and body weight were observed and recorded subsequently,and the minimal effective dose of CTX that could cure most of the tumor-bearing mice was found.Then another 12 tumor-bearing mice were randomly divided in...