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Murine endothelia do not express MHC class II I-Ealpha subunit and differentially regulate I-Aalpha expression along
A Karasin1, S Macvilay, M N Hart
1Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison 53706, USA.
Endothelium : Journal of Endothelial Cell Research
|February 4, 1999
Summary
Endothelial cells in the brain and aorta express Major Histocompatibility (MHC) class II molecules, influencing immune responses. Interleukin-10 differentially regulates this expression, suggesting organ-specific immune mechanisms.
Area of Science:
- Immunology
- Vascular Biology
- Neuroimmunology
Background:
- Cellular elements of the vascular wall, including endothelium (En) and smooth muscle cells/pericytes (SM/P), possess immunologic properties.
- Murine brain microvessel En cells and SM/P express Major Histocompatibility (MHC) class II molecules and activate syngeneic CD4+ T cells.
- Understanding organ-specific immune responses requires comparing immune molecule expression in different tissues.
Purpose of the Study:
- To compare Major Histocompatibility (MHC) class II expression on brain microvessel endothelium versus aorta large vessel endothelium.
- To explore the mechanisms of immune responses in brain tissue compared to peripheral tissues.
- To investigate the differential regulation of MHC class II expression by cytokines.
Main Methods:
- Comparative analysis of MHC class II subunit expression (I-A and I-E) on endothelial cells from murine brain microvessels and aorta.
- Assessment of MHC class II upregulation by interferon-gamma (IFN-gamma) and activated T cells.
- Evaluation of Interleukin-10 (IL-10) effects on IFN-gamma-mediated MHC class II upregulation.
Main Results:
- Endothelial cells from both brain microvessels and large aortic vessels express the I-A subunit but not the I-E subunit of MHC class II molecules.
- Interferon-gamma (IFN-gamma) upregulates I-A class II molecule expression on both brain microvessel and aortic endothelial cells.
- Interleukin-10 (IL-10) inhibits IFN-gamma-mediated I-A class II upregulation on aortic endothelial cells, but not on microvessel endothelial cells.
- Activated T cells upregulate I-A, but not I-E, MHC class II molecules on brain microvessel endothelial cells.
Conclusions:
- Differences in organ-specific immune responses may be influenced by local parameters, such as the distribution and regulation of Major Histocompatibility (MHC) class II molecules.
- Endothelial cells play a significant role in modulating immune responses within the brain and periphery.
- The differential regulation of MHC class II by IL-10 suggests distinct immune surveillance mechanisms in the brain versus other organs.