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Regulation of STAT1 and STAT4 Expression by Growth Factor and Interferon Supplementation in Sjögren's Syndrome Cell

Jean-Luc C Mougeot1,2, Thomas E Thornburg1,2, Braxton D Noll1,2

  • 1Translational Research Laboratories, Oral Medicine, Oral & Maxillofacial Surgery, Atrium Health-Carolinas Medical Center, Charlotte, NC 28203, USA.

International Journal of Molecular Sciences
|March 28, 2024
PubMed

Insights

Epidermal growth factor (EGF) and interferons (IFNs) impact STAT1 and STAT4 expression in Sjögren's syndrome cells. Targeting EGF/IFN pathways may regulate salivary gland epithelial cell inflammation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Sjögren's syndrome involves salivary gland inflammation and dysfunction.
  • Signal transducer and activator of transcription (STAT) proteins are crucial in immune responses.
  • Understanding STAT1 and STAT4 regulation in salivary gland epithelial cells is key for Sjögren's syndrome research.

Purpose of the Study:

  • To investigate the effects of epidermal growth factor (EGF) and interferons (IFNs) on STAT1 and STAT4 mRNA and protein expression.
  • To explore the role of these pathways in Sjögren's syndrome cell culture models.
  • To identify potential therapeutic targets for Sjögren's syndrome.

Main Methods:

  • Utilized immortalized salivary gland epithelial cells (iSGECs) and A253 cells.
  • Treated cells with EGF, IFN-alpha, -beta, -gamma, or p38-MAPK inhibitor.
  • Quantified STAT1 and STAT4 mRNA via qRT-PCR and detected phosphorylated proteins by Western blot analysis.

Main Results:

  • EGF treatment decreased STAT4 mRNA levels in all tested cell lines.
  • EGF and p38-MAPK inhibitor reduced STAT4 mRNA in A253 cells.
  • EGF combined with IFN-gamma synergistically increased phospho-STAT1 and phospho-STAT4 levels.

Conclusions:

  • EGF and interferons modulate STAT1 and STAT4 expression in salivary gland epithelial cells.
  • The Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway is a potential therapeutic target for Sjögren's syndrome.
  • Further research is needed to optimize targeting of the JAK/STAT pathway in Sjögren's syndrome.
Keywords:
EGFSTAT1STAT4cytokine regulationinterferons

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