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Area of Science:

  • Cardiovascular Research
  • Immunology
  • Molecular Biology

Background:

  • HMG-CoA reductase inhibitors (statins) reduce cardiovascular mortality through incompletely understood mechanisms.
  • T cells and apoptotic cells are present in atherosclerotic plaques, with reduced cellularity indicating plaque stability.
  • The Fas-Fas ligand (FasL) system is a key pathway for T cell-mediated apoptosis.

Purpose of the Study:

  • To investigate whether HMG-CoA reductase inhibitors regulate FasL expression and cytotoxicity in human T cells.
  • To elucidate the molecular mechanisms underlying statin-mediated regulation of FasL expression.

Main Methods:

  • Human T cells (Jurkat cells) were activated and treated with atorvastatin or simvastatin.
  • The role of protein prenylation and Rho GTPases in FasL expression was assessed using mevalonate, geranylgeranylpyrophosphate, farnesylpyrophosphate, and C3 exotoxin.
  • RhoA signaling was manipulated using constitutively active and dominant-negative constructs.
  • Cytotoxic activity was measured using FasL-sensitive target cells.
  • FasL expression was also analyzed in peripheral blood mononuclear cells and human carotid atherosclerotic plaques.

Main Results:

  • Atorvastatin and simvastatin prevented the increase in FasL expression on activated T cells.
  • Protein geranylation, specifically geranylgeranylation, and RhoA signaling were implicated in T cell FasL expression.
  • Atorvastatin reduced the cytotoxic activity of activated T cells.
  • Atorvastatin decreased FasL expression in peripheral blood mononuclear cells and atherosclerotic plaques.

Conclusions:

  • Atorvastatin regulates FasL expression in T cells, likely via inhibition of RhoA prenylation.
  • These findings suggest a novel mechanism by which atorvastatin influences T cell cytotoxicity and cellular content within atherosclerotic plaques.