Copyright © 2006, European Society of Cardiology
Granulocyte colony-stimulating factor (G-CSF) accelerates reendothelialization and reduces neointimal formation after vascular injury in mice
Division of Cardiovascular Science, Department of Organ Regeneration, Shinshu University Graduate School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
* Corresponding author. Tel./fax: +81 263 37 3352/+81 263 37 2573. Email address: masafumi{at}sch.md.shinshu-u.ac.jp
Objective Neointimal formation following percutaneous coronary intervention (PCI), termed restenosis, limits therapeutic revascularization. Since reendothelialization is one of the determinant factors for the development of neointimal formation, we examined the effects of granulocyte colony-stimulating factor (G-CSF) on reendothelialization and neointimal formation after vascular injury in mice.
Methods and results Wire-mediated vascular injury was produced in the femoral artery of C57BL/6 mice. G-CSF pretreatment significantly accelerated reendothelialization and decreased neointimal formation following vascular injury; however, this inhibitory effect of G-CSF was diminished when G-CSF was started following the injury. Flow cytometry analysis revealed that G-CSF treatment increased the number of endothelial progenitor cells (EPCs: CD34+/Flk-1+) in the peripheral circulation. Vascular injury was also produced in 2 types of mice whose bone marrow was replaced with that of enhanced green fluorescent protein- and Tie2/LacZ-transgenic mice. In the reendothelialized artery of these mice, few bone marrow-derived EPCs were detected. Furthermore, G-CSF treatment reduced the serum level of interleukin (IL)-6.
Conclusion G-CSF treatment accelerated reendothelialization and decreased neointimal formation following vascular injury, although there was little contribution of bone marrow-derived EPCs to the reendothelialization of the artery. These results suggest that G-CSF pretreatment has a therapeutic potential for prevention of restenosis following PCI.
KEYWORDS Atherosclerosis; Cytokines; Restenosis; Stem cells
Time for primary review 23 days
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