Lotteau V, Sands J, Teyton L, Turmel P, Charron D, Strominger J L
Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.
J Exp Med. 1989 Jan 1;169(1):351-6. doi: 10.1084/jem.169.1.351.
In the human there are three isotypic forms of MHC class II gene products (HLA-DR, -DQ, and -DP). The isotype-matched alpha-beta dimers are predominant but isotype-mismatched dimers can also be expressed (DR alpha-DQ beta). Here it is shown that the expression of the DR alpha-DQ beta dimer can be correlated to a high ratio of DR alpha/DR beta mRNA. The DR alpha chain expression was modulated by transfection of a sense and antisense DR alpha cDNA. Overexpression of DR alpha promoted the appearance of the DR alpha-DQ beta dimer. On the other hand, pre-existing DR alpha-DQ beta dimer expression was suppressed after antisense DR alpha cDNA transfection. Therefore, imbalanced expression of the alpha and beta chain from a given isotype could lead to the modification of HLA class II phenotype.
在人类中,主要组织相容性复合体II类基因产物有三种同种型形式(HLA - DR、- DQ和- DP)。同种型匹配的α-β二聚体占主导地位,但同种型不匹配的二聚体也可以表达(DRα - DQβ)。本文表明,DRα - DQβ二聚体的表达与DRα/DRβ mRNA的高比率相关。通过转染正义和反义DRα cDNA来调节DRα链的表达。DRα的过表达促进了DRα - DQβ二聚体的出现。另一方面,在反义DRα cDNA转染后,预先存在的DRα - DQβ二聚体表达受到抑制。因此,来自给定同种型的α链和β链表达失衡可能导致HLA II类表型的改变。