1，2-二甲肼对小鼠结直肠与卵巢的影响

Pathogenic and tumorigenic effect of 1,2-dimethylhydrazine in mouse colon and ovarian

目的探讨1,2-二甲肼（1,2-dimethylhydrazine,DMH）对小鼠结直肠与卵巢的影响。方法 60只雌性ICR小鼠随机平均分为A、B两组,A组给予腹腔注射DMH（20mg/kg,每周1次,连续24周）,B组注射生理盐水作为对照,首次注射后12、16、20、24、28和32周分批处死小鼠,观察其结直肠与卵巢病理形态学改变。结果 A组小鼠结直肠发生显著病理改变,DMH注射1216周后,小鼠结直肠上皮出现不同程度增生改变,20周后,2只小鼠发生结直肠肿瘤,并且随DMH作用时间的延长,肿瘤发生率逐渐增加,至32周共有7只小鼠发生结直肠腺瘤,5只结直肠腺癌,且肿瘤主要位于距肛门8cm内;值得注意的是,A组小鼠卵巢也发生明显病理改变,32周内共见21只A组小鼠发生卵巢血肿伴慢性炎症改变,而且,28和32周各发现1只A组小鼠卵巢出现绒毛膜癌病理学改变。实验过程中B组小鼠均未见异常。结论 DMH对小鼠结直肠与卵巢组织形态学变化具有显著影响。

Objective To study the pathogenic and tumorigenic effect of 1,2-dimethylhydrazine （DMH） on the colon and ovaries of mice. Methods Sixty ICR female mice were randomly divided into groups A and B for intraperitoneal injection of DMH （20 mg/kg） and saline （control） once a week for 24 weeks, respectively. The mice were sacrificed at 12, 16, 20, 24, 28 and 32 weeks after the first DMH injection for pathological examination of the colon and ovaries. Results In group A, colorectal adenomas were found in 7, colorectal adenocarcinomas in 5, and hemorrhagic lesions of the ovaries with chronic inflammatory in 21 mice. Choriocarcinoma in the ovaries were detected in one mouse at 28 weeks and in another at 32 weeks. No obvious pathological changes were found in group B following the injections. Conclusion Intraperitoneal injection of DMH may induce colon tumors and ovarian diseases in mice