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Related Experiment Videos

Stress-induced modulation of antigen-presenting cell function.

A D Rees1, Y Donati, G Lombardi

  • 1MRC Tuberculosis & Related Infections Unit, Hammersmith Hospital, London, U.K.

Immunology
|November 1, 1991
PubMed
Summary
This summary is machine-generated.

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Heat and oxygen radicals affect antigen presentation by B cells. Stress enhances T-cell responses, but hydrogen peroxide inhibits antigen processing, impacting immune cell interactions.

Area of Science:

  • Immunology
  • Cellular Stress Responses

Background:

  • Antigen-presenting cells (APCs), specifically B cells, play a crucial role in initiating immune responses by presenting antigens to T cells.
  • Cellular stress, induced by heat or oxygen radicals, can modulate APC function and influence T-cell activation.
  • Understanding how stress affects antigen presentation is vital for comprehending immune regulation in various physiological and pathological conditions.

Purpose of the Study:

  • To investigate the impact of heat stress and oxygen radicals on the antigen-presenting capabilities of an HLA-DR1 B-cell line.
  • To determine how these stress conditions affect the stimulation of both auto- and alloreactive T-cell clones, as well as antigen-specific T-cell clones.
  • To elucidate the mechanisms underlying stress-induced modulation of antigen presentation, including changes in protein synthesis and cell-surface molecule expression.

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Main Methods:

  • Utilized an HLA-DR1 B-cell line as the APC model.
  • Applied heat stress and oxygen radicals (hydrogen peroxide) to induce cellular stress.
  • Assessed T-cell stimulation using DR1-restricted and anti-DR1 auto- and alloreactive T-cell clones, as well as an influenza-virus specific T-cell clone.
  • Analyzed protein synthesis via SDS-PAGE, focusing on heat-shock proteins (HSP).
  • Investigated antigen processing by treating APCs at different time points with antigen and peroxide.

Main Results:

  • Both heat and oxygen radical stress enhanced B-cell stimulation of auto- and alloreactive T-cell clones and peptide presentation.
  • Heat stress augmented the presentation of whole influenza virus, correlating with increased MHC class II expression, though insufficient to fully explain functional effects.
  • Hydrogen peroxide inhibited whole antigen presentation in a dose-dependent manner and did not induce stress proteins.
  • Heat stress did not protect APCs from the inhibitory effects of subsequent peroxide treatment.
  • Peroxide's inhibition of antigen presentation occurred at a stage similar to aldehyde fixation, suggesting interference with antigen processing.

Conclusions:

  • Cellular stress, particularly heat, can enhance APC function and T-cell responses through mechanisms possibly involving MHC class II upregulation.
  • Oxygen radicals, specifically hydrogen peroxide, exert distinct inhibitory effects on antigen presentation, primarily by interfering with the antigen processing pathway.
  • The differential effects of heat and peroxide highlight the complexity of stress-induced modulation of immune cell interactions and suggest distinct cellular targets for each stressor.