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Ref-1 drives ulcerative colitis induced systemic defects in hematopoietic cells.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Hematology

Background:

  • Ulcerative colitis (UC) is an inflammatory bowel disease impacting the GI tract and bone marrow.
  • UC is linked to immune-mediated mechanisms causing systemic effects.
  • Abnormal hematopoiesis (blood cell formation) is a consequence of chronic UC.

Purpose of the Study:

  • To elucidate the molecular mechanisms of UC-induced abnormal hematopoiesis.
  • To investigate the role of the APE1/Ref-1/HIF-1α/IL-1r1 signaling pathway in UC-related hematopoiesis.
  • To evaluate the therapeutic potential of targeting this pathway.

Main Methods:

  • Analysis of molecular mechanisms in UC models.
  • Investigating HSPC (hematopoietic stem and progenitor cell) differentiation.
  • Pharmacological blockade of APE1/Ref-1 redox activity using APX3330.
  • Pharmacological inhibition of HIF-1α activity using echinomycin.

Main Results:

  • Chronic UC promotes HSPC differentiation towards myelopoiesis via APE1/Ref-1/HIF-1α/IL-1r1.
  • APX3330 inhibited HIF-1α expression and reversed aberrant HSPC dynamics in UC.
  • HIF-1α blockade suppressed pro-inflammatory Ly6Chi monocytes.
  • Targeting APE1/Ref-1 redox activity rescued abnormal HSPC function.

Conclusions:

  • The APE1/Ref-1/HIF-1α/IL-1r1 cascade is crucial in UC-associated aberrant hematopoiesis.
  • This signaling pathway contributes to UC pathophysiology through a feed-forward loop.
  • Targeting APE1/Ref-1 offers a potential therapeutic strategy for UC complications.