期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1981
卷号：78
期号：9
页码：5754-5758
DOI：10.1073/pnas.78.9.5754
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Murine teratocarcinoma stem cells, unlike most other cell types, do not express major histocompatibility antigens. The steady-state levels of beta 2-microglobulin and H-2 mRNA from F9-derived teratocarcinoma stem and differentiated cells were examined by blot hybridization using cloned DNA probes specific for these mRNAs. No H-2- or beta 2-microglobulin-specific RNA was detected in F9 teratocarcinoma stem cells (clone 12-1); thus, F9 teratocarcinoma stem cells (clone 12-1) contain no more than 1/10 the H-2 and beta 2-microglobulin mRNAs of the differentiated daughter cells (clone 12-1a). We suggest that this regulation of major histocompatibility antigen expression is due to transcriptional control of the major histocompatibility antigen genes, H-2 and beta 2-microglobulin. The transcriptional regulation of these genes is accompanied by a change in their DNase I sensitivity. Normally, transcriptionally inactive genes are DNase I resistant, while active genes are DNase I sensitive. In contrast, the silent major histocompatibility antigen genes of teratocarcinoma stem cells are more DNase I sensitive than the active genes of the differentiated cells.
