Holscher M, Givan A L, Brooks C G
Department of Immunology, The Medical School, Newcastle upon Tyne.
Immunology. 1991 May;73(1):44-51.
To test the hypothesis that major histocompatibility complex (MHC) molecules protect target cells from lysis by natural killer cells (NKC), we transfected the MHC- B16 melanoma line F10 with the class I genes encoding Dd, Kb, and Kk. Only low levels of Dd expression could be obtained and there was no protection against NKC. By contrast, Kb and Kk transfectants were obtained which displayed significant resistance to NKC, and with the latter transfectants resistance was clearly related to the level of transgene expression. Various mutants of the F10 line with altered patterns of MHC expression were also obtained. These mutant lines provided evidence that (i) the Db molecule is also capable of inducing resistance to NKC and (ii) high MHC class I expression does not by itself guarantee lowered susceptibility to NKC.
为了验证主要组织相容性复合体(MHC)分子可保护靶细胞免受自然杀伤细胞(NKC)裂解这一假说,我们用编码Dd、Kb和Kk的I类基因转染了MHC - B16黑色素瘤细胞系F10。仅获得了低水平的Dd表达,且未观察到对NKC的保护作用。相比之下,获得了对NKC具有显著抗性的Kb和Kk转染细胞,对于后者,抗性明显与转基因表达水平相关。还获得了具有改变的MHC表达模式的F10细胞系的各种突变体。这些突变细胞系提供了以下证据:(i)Db分子也能够诱导对NKC的抗性;(ii)高MHC I类表达本身并不能保证对NKC的易感性降低。