大鼠胰腺癌和非癌胰腺组织的KiSS-1 mRNA表达

目的:建立Sprague-Dawely大鼠胰腺癌模型,研究模型中胰腺导管癌和非癌胰腺组织中KiSS-1mRNA的表达情况.方法:将二甲基苯并蒽(dimethylbenzanthracene,DMBA)直接置入胰腺被膜下实质内建立胰腺癌模型组(A组),另一组同样注入DMBA并每周腹腔注射曲古霉素(trichostatin,TSA)设立干预组(B组),A组和B组于3～5个月内处死,对照组(C组)于第5个月处死,肉眼检查大组织及HE染色观察胰腺癌发生情况;采用原位杂交方法检测KiSS-1 mRNA.结果:(1)实验组(A组)3～5个月癌发生率为48.7%(18/37),17例为胰腺导管癌,1例为纤维肉瘤;B组3～5个月癌发生率为33.3%(12/36),11例为胰腺导管癌,1例为纤维肉瘤,A组胰腺癌最大径均值大于B组(P＜0.05);C组胰腺及A组、B组胰腺非主要脏器均无明显病理改变.(2)A组和B组胰腺癌组织中KiSS-1mRNA阳性率明显低于非癌胰腺组织(P＜0.01),A组和B组胰腺癌KiSS-1mRNA阳性率分别低于相应A组和B组非癌组织(P＜0.01),非癌胰腺组织中KiSS-1 mRNA阴性表达者导管上皮均呈中至重度不典型增生,C组胰腺组织KiSS-1mRNA均阳性表达.结论:较大剂量DMBA置入胰实质内,可在短期内获得较高胰腺癌发生率;TSA能干预胰腺癌的生长;KiSS-1失表达在胰腺癌发生发展中可能具有重要的作用.

Expression of KiSS-1mRNA in pancreatic ductal adenocarcinomaand non-cancerous pancreatic tissues in SD rats

OBJECTIVE: To establish a model of pancreatic cancer in Spragu-Dawely (SD) rats, and to examine the expression level of KiSS-1mRNA in pancreatic cancer and non-cancerous pancreatic tissues in SD rats. METHODS: Dimethylbenzanthracene (DMBA) was directly implanted into the parenchyma of pancreas in SD rats (Group A), and DMBA combined with trichostatin (TSA) was implanted in the intervention group (Group B). The carcinogenesis of rats executed within 3 - 5 months in Group A and Group B were observed by HE staining and macrography. Meanwhile, the rats in the control (Group C) were executed in 5 months. The expression of KiSS-1mRNA was assayed by in situ hybridization. RESULTS: (1) The incidence of pancreatic cancer in Group A within 3 - 5 months was 48.7% (18/37), including 17 cases of pancreatic ductal adenocarcinoma and 1 case of fibrosarcoma. The incidence of pancreatic cancer in Group B was 33.3% (12/36), including 11 pancreatic ductal adenocarcinoma and 1 fibrosarcoma. The maxial diameter of tumor mass in Group A was higher than that in Group B (P<0.05). (2) The positive rates of KiSS-1 mRNA in pancreatic cancer in Group A and Group B were significantly lower than those in non cancerous pancreatic tissues in Group A and Group B (P<0.01). The positive rates of KiSS-1mRNA in Group A or Group B with ductal adenocarcinoma were significantly lower than those in Group A or Group B without ductal adenocarcinoma (P<0.01). The middle or severely atypical ductal hyperplasia was observed in non-cancerous pancreatic tissues with the negative KiSS-1mRNA. CONCLUSION: DMBA directly implanted into the parenchyma of pancreas can obtain an ideal pancreatic cancer model with high incidence in a short time. TSA may have an inhibitive effect on the carcinogenesis and the growth of pancreatic ductal adenocarcinoma in rats, and KiSS-1 may play an important role in inhibiting the invasion and metastasis of pancreatic cancer.