Related Experiment Videos
Post-translational modifications of self antigens: implications for autoimmunity
1University of Edinburgh, Institute of Immunology and Infection Research, School of Biological Sciences, Kings Buildings, West Mains Road, Edinburgh, EH9 3JT, UK. Steve.anderton@ed.ac.uk
Current Opinion in Immunology
|October 30, 2004
Summary
Altered self proteins can create new epitopes, triggering autoimmune responses. Post-translational modifications (PTMs) are key in how the immune system recognizes these altered self-epitopes, influencing immune attack.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Self proteins can be altered by changes in amino acid sequence, generating neo-epitopes.
- These neo-epitopes can lead to autoimmune diseases by triggering an autoaggressive immune attack.
- Post-translational modifications (PTMs) are a significant factor in the immune system's recognition of self-epitopes.
Purpose of the Study:
- To explore how post-translational modifications (PTMs) of mammalian proteins contribute to the immune recognition of neo-self epitopes.
- To investigate the impact of PTMs on the binding affinity of Major Histocompatibility Complex (MHC) and T-cell receptors (TCR).
- To understand the subtle effects of PTMs on proteolytic enzymes involved in antigen processing and their role in directing self-recognition.
Main Methods:
- Analysis of amino acid sequence alterations in self proteins.
- Investigating various post-translational modifications (PTMs) of mammalian proteins.
- Assessing the binding affinity of MHC and T-cell receptors to neo-epitopes.
- Studying the activity of proteolytic enzymes in antigen processing.
- Examining the interplay between inflammation, enzyme activity, and protein modification.
Main Results:
- Alterations in amino acid sequences can generate neo-epitopes from self proteins, initiating autoimmune responses.
- Post-translational modifications (PTMs) enable immune recognition of these neo-self epitopes.
- PTMs can modulate MHC and T-cell receptor binding affinity, influencing immune responses.
- Subtle effects of PTMs on proteolytic enzymes involved in antigen processing were observed.
- Complex interactions involving inflammation, enzyme activity, and protein modification direct self-recognition.
Conclusions:
- Post-translational modifications (PTMs) play a crucial role in the generation and immune recognition of neo-self epitopes.
- The interplay between inflammation, enzyme activity, and PTMs is critical in directing self-recognition and autoimmune responses.
- Understanding these mechanisms offers insights into the development of autoimmune diseases and potential therapeutic strategies.