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Heat shock increases antigenic peptide generation but decreases antigen presentation
E Pépin1, C L Villiers, F M Gabert
1Laboratoire d'Immunochimie, CEA-G, INSERM U238 and Université Joseph Fourier, Grenoble, France. PEPIN@dsvgre.cea.fr
European Journal of Immunology
|December 1, 1996
Summary
Heat shock impairs B cell antigen presentation by disrupting intracellular peptide loading onto MHC class II molecules, despite normal antigen capture and processing. This stress response affects immune cell function.
Area of Science:
- Immunology
- Cellular Stress Response
Background:
- The heat shock response is a conserved cellular mechanism to cope with stress.
- B cells play a crucial role in antigen presentation to T cells.
Purpose of the Study:
- To investigate the impact of elevated temperature (heat shock) on B cell antigen presentation capacity.
- To elucidate the specific mechanisms affected by heat shock in B cells.
Main Methods:
- Assessing antigen processing and presentation of tetanus toxin by B cells under heat shock conditions.
- Evaluating antigen capture, MHC class II molecule expression, and intracellular peptide generation.
- Measuring cathepsin B activity in stressed and non-stressed B cells.
Main Results:
- Heat shock significantly inhibits the ability of B cells to present tetanus toxin to T cells.
- Antigen capture and MHC class II expression remain unaffected by heat shock.
- Heat shock increases intracellular antigen peptide generation and cathepsin B activity.
Conclusions:
- Heat shock disrupts B cell antigen presentation by interfering with the intracellular loading of peptides onto MHC class II molecules.
- The observed increase in peptide generation and cathepsin B activity suggests a bottleneck in peptide-MHC complex formation during cellular stress.