Expression of A, G and B melanoma antigen genes in human hepatocellular carcinoma

Objective: To observe the expression of the A melano- ma antigen (MAGE), G melanoma antigen (GAGE) and B melanoma antigen (BAGE) genes in human hepatocellular carcinoma cell lines. Methods: The MAGE-1, MAGE-3, GAGE1-8, GAGE1-2 and BAGE mRNA lever in hepatocellular carcinoma cell lines SMMC-7721, QQY-7701, BEL- 7402 were studied by reverse transcription polymer- ase chain reaction and were compared with biopsied liver tissues. Results: MAGE-1 and BAGE mRNA were expressed in SMMC-7721, MAGE-3 and BAGE in QGY-7701, MAGE-1 and GAGE1-2 in BEL-7402. None of these genes was expressed in biopsied liver tissues. Conclusions: MAGE-1, MAGE-3, GAGE1-8, GAGE1-2 and BAGE were expressed in hepatocellu- lar carcinoma cell lines, respectively. These tumor- specific antigens can be used as molecular markers and possible targets of immunotherapy for patients with hepatocellular carcinoma.

MAGE-A家族抗原共同B细胞表位预测分析

目的：预测和筛选黑色素瘤抗原A（MAGE-A）家族抗原的共同B细胞表位。方法：以MAGE-A1的全长氨基酸序列为基础,利用生物信息学软件,采用Hopp＆Woods的亲水性方案、Zimmerman极性参数和Jameson-Wolf抗原指数方案和Emini表面可及性方案等,结合MAGE-A1的二级结构与其柔性区域及跨膜区域对MAGE-A1的优势B表位区段进行综合分析,进一步运用抗原指数分析预测MAGE-A1的B细胞表位,并将其与MAGE-A家族中其他成员（MAGE-A2至A12）进行比对,以预测MAGE-A家族抗原的共同B细胞表位。结果：MAGE-A1的全长为309个氨基酸,相对分子质量为46 kDa,为可溶性蛋白。经综合分析,其B细胞优势表位可能存在于氨基酸序列N端的9~14,84~88,118~124,160~165,208~214,233~240区段;经与MAGE-A家族中其他成员的氨基酸序列比对,MAGE-A1的9~14,84~88,118~124及233~240区段,即HCKPEE,EEEGP,RAREPVTK,GEPRKLLT肽段可能为MAGE-A家族抗原共同B细胞优势表位。结论：利用生物信息学预测发现MAGE-A1的优势B细胞表位中,9~14,84~88,118~124及233~240区段可能为MAGE-A家族抗原的共同B细胞表位,可为表位疫苗的研制等提供理论依据。

人血型B抗原模拟多肽P1/Fas-Mip3β双表达重组质粒的构建及鉴定

目的构建并鉴定人血型B抗原模拟多肽、巨噬细胞炎症蛋白3β(Mip3β)双表达重组质粒。方法抗血型B抗体筛选噬菌体随机12肽库,筛选阳性噬菌体克隆P1,设计特异性引物扩增P1噬菌体DNA,同样设计特异性引物扩增PBluscript-Fas基因的跨膜区及胞内段,与P1酶切连接,最后与质粒PORF5-mMip3βv21扩增巨噬细胞炎症蛋白3β基因酶切连接,获得血型B抗原模拟多肽、Mip3β双表达重组质粒并进行鉴定,并在人黑色素瘤细胞株B16中转染与表达。结果和结论成功制备了血型B抗原模拟多肽、Mip3β双表达重组质粒,并在黑色素瘤细胞株B16中成功表达。