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Compound C Reducing Interferon Expression by Inhibiting cGAMP Accumulation.

Junzhong Lai1,2, Xuan Luo1,2, Shuoran Tian1,2

  • 1Fujian Key Laboratory of Innate Immune Biology, Biomedical Research Center of South China, Fujian Normal University Qishan Campus, Fuzhou, China.

Frontiers in Pharmacology
|March 18, 2020
PubMed
Summary
This summary is machine-generated.

Compound C inhibits the cyclic GMP-AMP synthase (cGAS) pathway, reducing type I interferon production. This finding offers a new therapeutic strategy for autoimmune diseases driven by DNA sensing.

Keywords:
DNA sensingcGAMPcGAScompound Cdorsomorphintype I interferon

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Area of Science:

  • Immunology
  • Molecular Biology
  • Pharmacology

Background:

  • Cyclic GMP-AMP (cGAMP) synthase (cGAS) is a key sensor of cytosolic DNA, initiating innate immune responses.
  • Dysregulated cGAS signaling is implicated in autoimmune diseases like Aicardi-Goutieres syndrome and systemic lupus erythematosus.
  • Inhibiting cGAS presents a potential therapeutic avenue for these conditions.

Purpose of the Study:

  • To investigate the potential of Compound C, a known inhibitor of AMPKs and ALK kinases, in modulating the cGAS-STING pathway.
  • To determine if Compound C's effects on DNA-induced interferon production are independent of AMPK activity.
  • To explore Compound C's therapeutic potential in a preclinical model of autoimmune disease.

Main Methods:

  • In vitro enzymatic assays to assess Compound C's effect on cGAMP accumulation.
  • Liquid chromatography-mass spectrometry (LC-MS) for quantifying cGAMP levels.
  • Evaluation of Compound C in a mouse model with Trex1 deficiency to assess autoimmune phenotypes.

Main Results:

  • Compound C suppressed dsDNA-dependent type I interferon induction.
  • The observed suppression was independent of AMP-activated protein kinase (AMPK) activity.
  • Compound C reduced cyclic GMP-AMP (cGAMP) accumulation, indicating modulation of the cGAS-STING pathway.
  • Compound C ameliorated autoimmune phenotypes in a Trex1-deficient mouse model.

Conclusions:

  • Compound C exhibits a novel inhibitory effect on the cGAS-STING pathway, independent of AMPK.
  • Compound C reduces type I interferon production triggered by cytosolic DNA.
  • Compound C demonstrates therapeutic potential for autoimmune conditions associated with aberrant DNA sensing.