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Scientists identified key regulators of lambda interferon 1 (IFNL1) in human colon cells. Inhibiting ZEB1 or NF-κB p50 boosted antiviral defenses, suggesting new therapeutic strategies for intestinal infections.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Molecular Biology

Background:

  • Intestinal immune responses are vital for colon health, with viruses like noroviruses being significant pathogens.
  • Lambda interferons (IFNL1-3), or Type III interferons, are crucial for antiviral defense in the intestine.
  • The IFNL1 receptor is expressed on epithelial and immune cells, highlighting its role at the immune-epithelial interface.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling IFNL1 expression in human colon epithelial cells.
  • To identify transcription factors and signaling pathways that modulate IFNL1 expression.
  • To explore potential therapeutic targets for enhancing antiviral immunity in the colon.

Main Methods:

  • Utilized the TLR3 agonist poly I:C to induce IFNL1 expression in SW480 colon cells.
  • Employed small interfering RNA (siRNA) to knockdown specific transcription factors.
  • Analyzed the effects of transcription factor manipulation on IFNL1 expression and antiviral gene induction.

Main Results:

  • ZEB1 and BLIMP-1 were identified as potent inhibitors of IFNL1 expression.
  • BLIMP-1 inhibited both Type I and Type III interferons, while ZEB1's inhibition was specific to IFNL1.
  • NF-κB p65 was found to activate IFNL1, whereas NF-κB p50 acted as an inhibitor.
  • siRNA-mediated knockdown of ZEB1 or NF-κB p50 significantly increased secreted IFN-λ1 protein and OAS1 expression.
  • Knockdown of p65 inhibited these antiviral responses.

Conclusions:

  • ZEB1 and NF-κB p50 are key negative regulators of IFNL1 expression in human colon epithelial cells.
  • NF-κB p65 is a key positive regulator of IFNL1 expression.
  • Modulating these factors offers a potential therapeutic strategy to enhance antiviral immunity in the colon.
  • These findings provide critical insights into the molecular control of IFNL1, a key antiviral mediator in the gut.