Comparative characterization of cellular and molecular anti-restenotic profiles of paclitaxel and sirolimus. Implications for local drug delivery

Thromb Haemost. 2007 Jun;97(6):1003-12.


Pleiotropic anti-restenotic properties of drugs that are eluted from coated stents are critical for efficacy and safety. Little is known about comparative drug properties in appropriate human coronary target cell lines for the two compounds that are utilized on FDA-approved drug-eluting stent (DES) platforms, paclitaxel (PTX) and sirolimus (SRL). Target cell lines that play a pivotal role for the pathogenesis of restenosis and vascular healing include human coronary artery smooth muscle (CASMC) and endothelial cells (CAEC). PTX and SRL inhibited CASMC and CAEC proliferation and migration efficiently. However, there was a differential effect on proliferation and migration in CAEC with a more profound inhibition of both parameters by PTX, even at low dosages. Induction of cytotoxicity and apoptosis was pronounced in PTX- and very modest in SRL-treated CASMC and CAEC. PTX increased eNOS activity and nitric oxide (NO) release from CAEC. Neutrophilic leukocyte activation and transmigration, which should be avoided since it may precipitate adverse coronary events such as restenosis and stent thrombosis, was suppressed by SRL, whereas PTX tended to increase neutrophilic leucocyte activity. Therefore, although the primary drug target, inhibition of mitogen-mediated CASMC proliferation, is effectively accomplished by both drugs, auxiliary pharmacological properties that are crucial for the anti-restenotic drug effect and vascular healing are considerably different between PTX and SRL. In comparison with PTX, SRL shows minor interference with endothelial cell proliferation and migration, lower levels of cytotoxicity and apoptosis, a broader therapeutic range and distinctive immunosuppressive properties.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Apoptosis / drug effects
  • Cardiovascular Agents / administration & dosage
  • Cardiovascular Agents / pharmacology*
  • Cardiovascular Agents / toxicity
  • Cell Cycle Proteins / metabolism
  • Cell Movement / drug effects
  • Cell Proliferation / drug effects
  • Cell Shape / drug effects
  • Cell Survival / drug effects
  • Cells, Cultured
  • Coronary Restenosis / pathology
  • Coronary Restenosis / prevention & control*
  • Coronary Vessels / drug effects
  • Dose-Response Relationship, Drug
  • Endothelial Cells / drug effects*
  • Endothelial Cells / metabolism
  • Endothelial Cells / pathology
  • Enzyme Activation / drug effects
  • Humans
  • Immunosuppressive Agents / administration & dosage
  • Immunosuppressive Agents / pharmacology*
  • Immunosuppressive Agents / toxicity
  • Muscle, Smooth, Vascular / drug effects*
  • Muscle, Smooth, Vascular / metabolism
  • Muscle, Smooth, Vascular / pathology
  • Myocytes, Smooth Muscle / drug effects*
  • Myocytes, Smooth Muscle / metabolism
  • Myocytes, Smooth Muscle / pathology
  • Neutrophil Activation / drug effects
  • Nitric Oxide / metabolism
  • Nitric Oxide Synthase Type III / metabolism
  • Paclitaxel / administration & dosage
  • Paclitaxel / pharmacology*
  • Paclitaxel / toxicity
  • Prosthesis Design
  • Research Design
  • Sirolimus / administration & dosage
  • Sirolimus / pharmacology*
  • Sirolimus / toxicity
  • Stents


  • Cardiovascular Agents
  • Cell Cycle Proteins
  • Immunosuppressive Agents
  • Nitric Oxide
  • NOS3 protein, human
  • Nitric Oxide Synthase Type III
  • Paclitaxel
  • Sirolimus