Lack of MHC-II expression in activated mouse T cells correlates with DNA methylation at the CIITA-PIII region |
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Authors: | Erik Schooten Petra Klous Peter J van den Elsen Tjadine M Holling |
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Institution: | (1) Division of Molecular Biology, Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Building 1, E3-Q, Albinusdreef 2, 2333 ZA Leiden, The Netherlands;(2) Department of Pathology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands |
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Abstract: | In contrast to activated human T cells, activated mouse T cells fail to express MHC class II molecules (MHC-II) at their cell
surface. This is because mouse T cells hardly produce mRNA encoding the MHC-II molecules I-A and I-E, due to severely impaired
expression levels upon T-cell activation of the mhc2ta gene, encoding the class II transactivator (CIITA). In humans, activated T cells express exclusively the CIITA promoter III
(CIITA-PIII) isoform, which results in cell surface expression of all MHC-II isotypes (HLA-DR, -DP and -DQ). In this study,
we demonstrate that methylation of CIITA-PIII contributes to the failure of mouse T cells to transcribe the mhc2ta and the resulting I-A/E genes, explaining the lack of I-A/E molecule expression at the cell surface following activation. |
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Keywords: | Mouse T cell Epigenetic modification DNA methylation |
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