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Interleukin-1 beta (IL-1β) promotes low-density lipoprotein (LDL) transcytosis in early atherosclerosis via a novel pathway involving the LDL receptor (LDLR) and Rab27a. This finding may explain how IL-1β accelerates early cardiovascular disease.

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Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Cell Biology

Background:

  • Early atherosclerosis involves low-density lipoprotein (LDL) transcytosis across endothelial cells.
  • The CANTOS trial showed interleukin-1 beta (IL-1β) blockade reduced cardiovascular events in advanced atherosclerosis.
  • The role of IL-1β in early atherosclerosis and LDL transcytosis was previously unknown.

Purpose of the Study:

  • To investigate the effect of IL-1β on LDL transcytosis in early atherosclerosis.
  • To elucidate the molecular mechanisms by which IL-1β regulates LDL transport.
  • To determine if IL-1β-mediated LDL transcytosis contributes to early cardiovascular disease.

Main Methods:

  • Quantification of LDL transcytosis using total internal reflection fluorescence microscopy in human coronary artery endothelial cells.
  • In vivo studies in mice involving IL-1β and LDL injection to visualize aortic arch deposition.
  • Genetic manipulation (knockdown, knockout, overexpression) of key molecules like LDLR, Rab27a, and Cav-1.

Main Results:

  • IL-1β induced LDL transcytosis at picomolar concentrations, independent of known receptors ALK-1 and SR-BI.
  • IL-1β increased LDL receptor (LDLR) expression, which was essential for the induced transcytosis.
  • Knockdown of Rab27a or its effector JFC1 abrogated IL-1β-induced LDL transcytosis in vitro and in vivo.
  • IL-1β-induced LDL accumulation in mouse aortas was blocked in LDLR or Rab27a-deficient mice.

Conclusions:

  • IL-1β induces LDL transcytosis through a novel pathway requiring LDLR and Rab27a, distinct from basal transcytosis.
  • This IL-1β-driven pathway may play a significant role in the progression of early atherosclerosis.
  • Targeting this pathway could offer new therapeutic strategies for preventing cardiovascular events.