【摘要】目的通过RNA干扰(RNAi)沉默HER2基因在涎腺黏液表皮样癌Mc3细胞中的表达方法将目的基因靶序列小干扰RNA(siRNA)转染Mc3细胞,并设置对照组,采用RTPCR、免疫组化检测RNA干扰后HER2基因在Mc3细胞中的表达情况。结果RTPCR结果显示RNA干扰后,HER2基因mRNA在涎腺黏液表皮样癌细胞中的表达与对照组比较明显降低;免疫组化实验结果显示RNA干扰后HER2基因蛋白在涎腺黏液表皮样癌细胞中的表达降低,与mRNA表达情况相一致。结论RNA干扰成功抑制了涎腺黏液表皮样癌细胞中HER2基因的表达,为口腔涎腺黏液表皮样癌针对癌基因HER2为靶基因的基因治疗提供研究基础。
ObjectiveTo summarize the clinical features of pulmonary mucoepidermoid carcinoma (PMEC) and improve the level of the diagnosis and therapy.MethodsA case of PMEC was reported and related literatures were reviewed in PubMed, WanFang data and China National Knowledge Infrastructure.ResultsA 21-year-old female patient, complaining of cough and expectoration for 5 months, intermittent hemoptysis for 3 months and repeated fever more than 4 days, was hospitalized in March 2017. After admission, the patient was diagnosed as low-grade PMEC and received anti-infection, fibrobronchoscope sputum aspiration and alveolar lavage therapy. During the hospitalization, the anti-infection of the patients was not much effective, and the chest CT examination suggested space-occupying lesions in the middle lobe of the right lung. After the surgical removal of the right lung, the syndrome of the patient was improved. A total of 13 patients were reviewed, there was no obvious gender difference, and the median age was about 40 years old (most frequently occurred in younger adults with an average age less than 50 years). Frequent clinical manifestations were cough, fever and hemoptysis, which were often accompanied with atelectasis. Most of the patients could be improved after surgical resection, and a few need comprehensive treatment including radiotherapy, chemotherapy and targeted treatment, etc.ConclusionsPMEC is rare and the etiology is still unclear. The pathology is mainly low-grade. Majority of patients with PMEC could be cured after surgical resection.
This patient was a 47-year female who underwent carinal resection and reconstruction because of left main bronchial mucoepidermoid carcinoma. She underwent four cycles chemotherapy when recovering from surgery because of subcarinal lymph node metastasis. However, the patient suffered from recurred productive cough and dyspnea during chemotherapy. Bronchoscopic assessment revealed stenosis at the reconstructed carina and left main bronchus five months after surgery. The granulation tissues of the left main bronchus showed no evidence of cancer recurrence. After repeated bronchoscopic resection of granulation tissue combined with bronchial stent placement, the left main bronchial stenosis gradually worsened with granulation tissue growth. Three acid-fast bacilli were found in the granulation tissue harvested ten months after surgery. The reason of postoperative bronchostenosis was confirmed as endobronchial tuberculosis, and antitubercular agents were added. Unfortunately, she had persistent left main bronchostenosis due to irreversible destruction and left pulmonary atelectasis thereafter. Therefore, for the recurring anastomotic granulomas after tracheobronchial reconstruction, the possibility of tuberculosis infection should be considered.