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Genistein Targets STING-Driven Antiviral Responses.

Tomalika R Ullah1,2, Katherine R Balka3,4, Rebecca L Ambrose1,2

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Summary

Genistein, found in soy, inhibits the cyclic GMP-AMP (cGAMP) synthase (cGAS)-stimulator of interferon genes (STING) antiviral pathway. This compound reduces intercellular communication and STING activation, potentially hindering antiviral defenses.

Keywords:
GenisteinSTING inhibitorcGAMPgap junction

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Cytoplasmic DNA sensing by cyclic GMP-AMP (cGAMP) synthase (cGAS) activates the stimulator of interferon (IFN) genes (STING) pathway, crucial for antiviral immunity.
  • Intercellular transfer of cGAMP via gap junctions propagates STING-mediated antiviral responses to adjacent cells.

Purpose of the Study:

  • To investigate the effect of Genistein, a soy-derived flavonoid, on the cGAS-STING antiviral signaling pathway.
  • To elucidate the mechanisms by which Genistein modulates STING activation and intercellular communication.

Main Methods:

  • Genistein pretreatment of cells to assess its impact on gap-junction intercellular communication.
  • Inhibition assays using a murine agonist (DMXAA) to evaluate direct effects on STING activation.
  • Western blotting to analyze the interaction between STING, TBK1, and IKKε.
  • Assessment of antiviral activity against Semliki Forest Virus infection.

Main Results:

  • Genistein inhibited gap-junction intercellular communication, reducing STING signaling in adjacent cells.
  • Genistein directly blocked STING activation by decreasing STING's interaction with TBK1 and IKKε.
  • Genistein attenuated STING signaling in human and mouse cells, dampening antiviral activity against Semliki Forest Virus.

Conclusions:

  • Genistein exhibits a proviral activity by inhibiting the cGAS-STING pathway at two key levels: cGAMP transfer and STING sensing.
  • The findings suggest caution in using Genistein as an antiviral, as it may counteract host-protective STING activation.