HLA-G mRNA差异表达对细胞膜表面HLA-G异构体分子表达的影响

目的 探讨HLA-G异构体(HLA-G1～6)mRNA差异表达对HLA-G分子在细胞表面表达的影响.方法 通过RT-PCR方法分析卵巢癌细胞株HO-8910、H0-8910PM、OVCAR-3,白血病细胞株Jurkat、K562、HL60、MUTZ-1,绒癌细胞株JEG-3、JAR内HLA-G异构体mRNA的表达种类,采用流式细胞术分析上述细胞株细胞表面及细胞内HLA-G分子的分布及表达水平.结果 阳性对照JEG-3细胞内表达HLA-G1～6 mRNA,阴性对照JAR不表达HLA-G1～6 mRNA.HLA-G1 mRNA在HO-8910、HO-8910PM、OVCAR-3、MUTZ-1、Jurkat细胞内表达.除阳性对照JEG-3外,其他细胞均不表达HLA-G2 mRNA;表达HLA-G3 mRNA的细胞有HO-8910、HO-8910PM、K562、HL60、MUTZ-1、OVCAR-3、Jurkat;表达HLA-G4 mRNA的细胞有HO-8910、HO-8910PM、HL60、Jurkat;表达HLA-G5mRNA的细胞为Jurkat.FACS分析显示在JEG-3、HO-8910PM、Jurkat细胞膜表面表达HLA-G分子,而除JAR细胞外,其他细胞内均表达HLA-G分子.结论 HLA-G2、-G3、-G4、-G5、-G6均不能在细胞表面表达,而HIJA-G1分子则能在特定的细胞表面表达.

Effect of different HLA-G isoforms mRNA on its cell membrane expression

Objective To investigate the mechanism of different HLA-G isoform mRNA patterns in different cells alters its cell membrane expression.Methods RT-PCR was used to analyze HLA-G isoform mRNA(HLA-Gl-6)of ovarian cancer cell lines HO-8910,HO-8910PM and OVCAR-3,leukemia cell lines Jurkat,K562,HIJ60,MUTIZ-1,and the chorioeareinoma cell lines JEG-3,JAR.HLA-G between cellular membrane and intracellular expression were analyzed by flow cytometry.Results All HLA-G mRNA isoforms were observed in the positive control cell line JEG-3,but none in the negative control cell line JAR.HLA-G1 isoform mRNA was expressed in HO-8910,HO-8910PM,OVCAR-3,MUTZ-1 and Jurkat cells.HLA-G2 mRNA was not detected in any cell line but JEG-3.HLA-G3 mRNA was found in HO-8910,HO-8910PM,K562,HIJ60,MUTZ-1,OVCAR-3 and Jurkat cells.HO-8910,HO-8910PM,HIJ60,Jurkat cells expre8sed HLA-G4 mRNA.Only the Jurkat cells expressed HLA-G5 mRNA.FACS results showed that JEG3 and HO-8910PM cells membrane expressed HLA-G,however,the intraeellular HLA-G expression was detected in all tested cells except the negative control cell JAR.Conclusion Only the HLA-G1 isoform could be exDressed on cell membrane in particular cell lines. Other isoforms including HLA-C2,-G3,-G4,-G5 and HLA-G6 could not reach cell snrface.