Related Experiment Video

Updated: Jun 14, 2025

Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice

Published on: March 24, 2017

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Protein kinase R is highly expressed in dermatomyositis and promotes interferon-beta-induced muscle damage

Guoyong Zhang1,2, Lining Zhang3,4, Dandan Zhao3

  • 1Department of Neurology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China.

Annals of the Rheumatic Diseases
|September 5, 2024
PubMed
Abstract

Insights

Protein kinase R (PKR) is specifically expressed in dermatomyositis (DM) muscle, suggesting its role in the disease. Inhibiting PKR may offer a therapeutic strategy for DM by reducing muscle damage.

Area of Science:

  • Immunology
  • Molecular Biology
  • Muscle Diseases

Background:

  • Dermatomyositis (DM) pathogenesis is linked to the type I interferon (IFN-I) pathway.
  • The exact molecular mechanisms and therapeutic targets in DM require further elucidation.

Purpose of the Study:

  • To explore molecular mechanisms underlying DM pathogenesis.
  • To identify potential therapeutic targets for DM.

Main Methods:

  • Bioinformatics analysis to identify molecular signatures in DM.
  • Quantitative PCR, Western blot, and immunohistochemistry (IHC) to assess protein kinase R (PKR) expression in DM muscle.
  • In vitro studies using IFN-β stimulation of myoblasts and myotubes to investigate PKR's role.

Main Results:

  • Bioinformatics analysis highlighted viral infection and IFN-I signaling as key pathological processes.
  • PKR was significantly expressed in the cytoplasm of myofibers in DM patients, with high diagnostic sensitivity (84.6%) and specificity (97.6%).
  • IFN-β upregulated PKR and pathogenic molecules in vitro; PKR inhibition reduced IFN-β-induced muscle damage.

Conclusions:

  • PKR shows specific cytoplasmic expression in DM muscle tissue.
  • Inhibiting PKR ameliorates IFN-β-induced muscle damage in vitro, indicating potential diagnostic and therapeutic roles for PKR in DM.
Keywords:
Autoimmune DiseasesAutoimmunityDermatomyositis

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