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Related Experiment Video

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Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus
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Epigenetically Altered T Cells Contribute to Lupus Flares.

Bruce Richardson1

  • 1Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI 48103-2200, USA. brichard@umich.edu.

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|February 16, 2019
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Summary

Environmental triggers like infections and certain drugs can cause lupus flares by activating specific T cells. These autoreactive cells, previously uncharacterized, are now a key therapeutic target for managing lupus flares.

Keywords:
DNA methylationenvironmentepigeneticslupus

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Lupus flares are triggered by environmental factors and drugs in genetically susceptible individuals.
  • The precise mechanisms underlying these flares, particularly the role of specific immune cells, have remained largely unclear.
  • Existing evidence suggested a link between certain drugs and environmental agents to immune system dysregulation.

Purpose of the Study:

  • To elucidate the mechanisms by which exogenous agents trigger lupus flares.
  • To identify and characterize the specific subset of CD4+ T cells involved in lupus pathogenesis.
  • To explore potential therapeutic targets for treating lupus flares based on these cellular mechanisms.

Main Methods:

  • Analysis of gene expression in CD4+ T cells following exposure to lupus-triggering agents.
  • Identification of distinct CD4+ T cell subsets in patients with active lupus.
  • Transcriptional profiling to identify unique protein expression in the identified T cell subset.

Main Results:

  • Procainamide, hydralazine, and inflammation induce DNA methylation changes in CD4+ T cells, leading to autoreactivity.
  • These modified CD4+ T cells were sufficient to induce lupus in mice and are present in active human lupus cases.
  • A distinct CD4+ T cell subset responsible for lupus flares was identified, exhibiting unique protein expression.

Conclusions:

  • Environmental agents and drugs can reprogram CD4+ T cells via DNA methylation, creating autoreactive cells that drive lupus flares.
  • This distinct CD4+ T cell subset represents a promising therapeutic target for lupus flare management.
  • Identifying unique proteins on these cells offers a strategy for targeted depletion and treatment of lupus flares.