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An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets
Published on: April 18, 2016
Cytokines regulate proteolysis in major histocompatibility complex class II-dependent antigen presentation by
E Fiebiger1, P Meraner, E Weber
1Division of Immunology, Allergy, and Infectious Diseases, Department of Dermatology, University of Vienna Medical School, Austria.
The Journal of Experimental Medicine
|April 17, 2001
Summary
Pro-inflammatory cytokines boost endolysosomal protease activity in dendritic cells, enhancing antigen presentation. Anti-inflammatory cytokines suppress this activity, impairing antigen presentation and T cell receptor interactions.
Area of Science:
- Immunology
- Cell Biology
- Protease biochemistry
Background:
- Endolysosomal proteases are crucial for antigen processing and presentation by major histocompatibility complex (MHC) class II molecules.
- Dendritic cells (DCs) play a central role in initiating adaptive immune responses through antigen presentation.
Purpose of the Study:
- To investigate the impact of pro-inflammatory and anti-inflammatory cytokines on endolysosomal protease activity in dendritic cells.
- To determine how cytokine-mediated protease modulation affects MHC class II dimer formation, antigen degradation, and T cell receptor engagement.
Main Methods:
- Treatment of human dendritic cells with tumor necrosis factor alpha, interleukin-1beta, and interleukin-10.
- Assay of cathepsin S and cathepsin B activity.
- Analysis of MHC class II sodium dodecyl sulfate-stable dimer formation.
- Measurement of T cell receptor downregulation in antigen-specific T cell clones upon exposure to tetanus toxoid.
Main Results:
- Pro-inflammatory cytokines (TNF-alpha, IL-1beta) rapidly increased cathepsin S and cathepsin B activity in DCs.
- This protease activation led to increased MHC class II dimer formation in a cathepsin S-dependent manner.
- Anti-inflammatory cytokine IL-10 suppressed cathepsin S and B activity, delaying MHC class II dimer formation and impairing antigen degradation.
- IL-10 treatment reduced the availability of MHC class II-peptide complexes for T cell receptor recognition.
Conclusions:
- Cytokine-mediated regulation of endolysosomal protease activity is a key mechanism controlling antigen presentation by dendritic cells.
- Pro-inflammatory cytokines enhance antigen presentation by activating proteases, while anti-inflammatory cytokines dampen it.
- This finding highlights a critical checkpoint in immune response modulation at the level of antigen processing.
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