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08:31
Characterization of Human Monocyte-derived Dendritic Cells by Imaging Flow Cytometry: A Comparison between Two Monocyte Isolation Protocols
Published on: October 18, 2016
Ethanol inhibits antigen presentation by dendritic cells.
Ahmet Eken1, Vivian Ortiz, Jack R Wands
1Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, Rhode Island, USA.
Clinical and Vaccine Immunology : CVI
|May 13, 2011
Summary
Chronic ethanol exposure impairs dendritic cell (DC) antigen presentation, particularly affecting peptide-MHCII complexes and costimulatory molecules, leading to T-cell dysfunction and immunosuppression.
Area of Science:
- Immunology
- Toxicology
- Cell Biology
Background:
- Chronic ethanol exposure is linked to altered virus-specific T-cell responses.
- Dendritic cells (DCs) are suspected to be involved in ethanol-induced immune dysfunction.
- Understanding ethanol's impact on DC antigen presentation is crucial for immune health.
Purpose of the Study:
- To investigate the effects of chronic ethanol consumption on exogenous antigen presentation by dendritic cells (DCs).
- To assess how ethanol influences peptide-MHC complex formation and costimulatory molecule expression on DCs.
- To determine the role of DCs in ethanol-induced immunosuppression.
Main Methods:
- Mice were fed ethanol or a control diet for 8 weeks.
- Splenic DCs were expanded, purified, and assessed for antigen presentation, processing, and peptide-MHC (pMHC) formation.
- T-cell activation was measured via IL-2 production in DC-T cell cocultures; flow cytometry analyzed pMHC complexes and costimulatory molecules.
Main Results:
- Ethanol suppressed allogeneic and exogenous ovalbumin (OVA) peptide presentation by DCs to T cells.
- Reduced peptide-MHC class II (pMHCII) complexes were observed on DCs from ethanol-fed mice.
- Cross-presentation via MHC class I (MHCI) remained intact, but DCs showed altered costimulatory molecule expression (reduced B7-DC, enhanced ICOS-L).
Conclusions:
- Ethanol inhibits exogenous and allogeneic antigen presentation by DCs, primarily affecting pMHCII formation.
- Altered costimulatory molecule expression on ethanol-exposed DCs contributes to T-cell dysfunction.
- DC antigen presentation and costimulatory environment are critical targets for ethanol's immunosuppressive effects.
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