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Histone deacetylase 6 (HDAC6) inhibition reduced inflammatory monocytes and neutrophils in a lupus model. However, T and B cell activation and IFN signature genes were not affected, indicating partial efficacy of HDAC6 inhibition in lupus.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Autoimmune Diseases

Background:

  • Systemic lupus erythematosus (SLE) involves excessive inflammation and autoantibodies.
  • Histone deacetylase 6 (HDAC6) inhibition shows potential in reducing lupus inflammation.
  • HDAC6-/- mice and a selective inhibitor (ACY-738) were used to investigate HDAC6's role.

Purpose of the Study:

  • To investigate the role of HDAC6 in pristane-induced lupus model.
  • To determine the effect of HDAC6 deficiency on inflammatory cell populations and IFN signature genes.
  • To explore the in vitro effects of HDAC6 inhibition on inflammatory signaling pathways.

Main Methods:

  • Pristane or PBS was administered to wild-type (WT) and HDAC6-/- mice.
  • Spleen and body weights were measured; sera and cells were collected for flow cytometry.
  • RT-qPCR was used to analyze IFN signature genes; in vitro studies used J774A.1 cells.

Main Results:

  • Pristane increased spleen weight and inflammatory monocytes/neutrophils, which were reduced in HDAC6-/- mice.
  • HDAC6 deficiency increased CD69+ T and B cells but did not affect IFN signature genes.
  • In vitro, HDAC6 inhibition increased NF-κB acetylation and Stat1 phosphorylation, leading to iNOS production.

Conclusions:

  • HDAC6 deficiency partially ameliorates lupus inflammation by reducing inflammatory monocytes and neutrophils.
  • HDAC6 plays a complex role, with inhibition affecting some inflammatory pathways but not others, including IFN responses.
  • Further research is needed to fully elucidate HDAC6's therapeutic potential in SLE.