Magnetic Tagging Increases Delivery of Circulating Progenitors in Vascular Injury

Panagiotis G. Kyrtatos, Pauliina Lehtolainen, Manfred Junemann-Ramirez, Ana Garcia-Prieto, Anthony N. Price, John F. Martin, David G. Gadian, Quentin A. Pankhurst, Mark F. Lythgoe
2009 JACC: Cardiovascular Interventions  
Objectives We sought to magnetically tag endothelial progenitor cells (EPCs) with a clinical agent and target them to a site of arterial injury using a magnetic device positioned outside the body. Background Circulating EPCs are involved in physiological processes such as vascular re-endothelialization and post-ischemic neovascularization. However, the success of cell therapies depends on the ability to deliver the cells to the site of injury. Methods Human EPCs were labeled with iron oxide
more » ... rparamagnetic nanoparticles. Cell viability and differentiation were tested using flow cytometry. Following finite element modeling computer simulations and flow testing in vitro, angioplasty was performed on rat common carotid arteries to denude the endothelium and EPCs were administered with and without the presence of an external magnetic device for 12 min. Results Computer simulations indicated successful external magnetic cell targeting from a vessel with flow rate similar to a rat common carotid artery; correspondingly there was a 6-fold increase in cell capture in an in vitro flow system. Targeting enhanced cell retention at the site of injury by 5-fold at 24 h after implantation in vivo. Conclusions Using an externally applied magnetic device, we have been able to enhance EPC localization at a site of common carotid artery injury. This technology could be more widely adapted to localize cells in other organs and may provide a useful tool for the systemic injection of cell therapies. (J Am Coll Cardiol Intv 2009;2:794 -802)
doi:10.1016/j.jcin.2009.05.014 pmid:19695550 fatcat:7jai5egzprczbciz6rvrr3fcpm