卵巢癌不易发生脑转移的机制探讨

目的 分析卵巢癌明显脑转移少见的可能机制.方法 将肺腺癌A549细胞株和卵巢癌Skov3细胞株分别通过尾静脉、腹腔、颈总动脉、颅内途径注入雌性裸鼠体内(每个途径16只裸鼠):4～6周后处死裸鼠,取其脑、肺、肾、脾脏、肝脏、输卵管、卵巢及腹腔肿瘤包块,进行HE染色,分析脑内成瘤情况.结果 尾静脉注射途径Skov3细胞株组无脑转移,A549细胞株组有2例脑转移;腹腔注射途径Skov3细胞株组无脑转移,A549细胞株组有2例脑转移;颈总动脉注射途径Skov3细胞株组未发现脑内成瘤,A549细胞株组8例脑内成瘤.以上3种颅外注射途径,Skov3细胞株与A549细胞株在颅内成瘤率比较,差异有统计学意义(P＜0.01).而直接颅内注入途径Skov3细胞株组14例脑内成瘤,A549细胞株组10例脑内成瘤,二者比较差异无统计学意义(P＞0.05).结论 血脑屏障可能在阻止卵巢癌脑转移过程中起了重要作用.

Investigation on mechanism of ovarian cancer scarcely developing brain metastasis

Objective To observe the intracranial tumorigenicity situation of lung cancer cell strain and ovarian cell strain by injecting them into the female nude mice with different approaches and to analyze the possible mechanism for scarce brain metastasis of ovarian cancer to provide a certain thinking for the treatment of brain metastasis of lung cancer.Methods Ovarian cancer cell strain Skov3 and lung cancer cell strain A549 were injected into female nude mice respectively through tail veins,abdominal cavity,common carotid artery and brain tissue.There were 16 nude mice in each approach.All the nude mice were killed 4-6 weeks later.Then the brain,lungs,kidneys,spleen,liver,fallopian tube,ovary and abdominal tumor mass were taken by HE staining for observing the cerebral tumorigenicity situation.Results By the caudal vein injection,there was no brain metastasis in the Skov3 strain group,while in the A549 strain group,2 cases of brain metastasis occurred.By the aabdominal cavity injection,there was no brain metastasis in the Skov3 strain group,but 2 cases of brain metastasis occurred in the A549 strain group.By the common ca rotid artery injection,there was no brain metastasis in the Skov3 strain group,but 8 cases of brain metastases occurred in the A549 group.The intracranial tumorigenicity of Skov3 strain and A549 strain had statistical difference among these 3 kinds of extracranial injection approaches(P＜0.01).By intracranial direct injection approach,14 cases of brain tumorigenicity occurred in the Skov3 strain group,while 10 cases of brain tumorigenicity occurred in the A549 strain group,the difference had no statistical difference.Conclusion Blood brain barrier maybe plays an important role in preventing ovarian cancer cells from metastasizing into brain.