Margination propensity of vascular-targeted spheres from blood flow in a microfluidic model of human microvessels. Academic Article uri icon


  • Many variants of vascular-targeted carriers (VTCs) have been investigated for therapeutic intervention in several human diseases. However, in order to optimize the functionality of VTC in vivo, carriers' physical properties, such as size and shape, are important considerations for a VTC design that evades the reticuloendothelial system (RES) and successfully interacts with the targeted vessel wall. Nonetheless, little evidence has been presented on the role of size in VTC's interactions with the vascular wall, particularly in the microcirculation. Thus, in this work, we explore how particle size, along with hemodynamics (blood shear rate and vessel size) and hemorheology (blood hematocrit) affect the capacity for spheres to marginate (localize and adhere) to inflamed endothelium in a microfluidic model of human microvessels. Microspheres, particularly the 2 m spheres, were found to show disproportionately higher margination than nanospheres in all hemodynamic conditions evaluated due to the poor ability of the latter to localize to the wall region from midstream. This work represents the first evidence that nanospheres may not exhibit "near wall excess" in microvessels, e.g., arterioles and venules, and therefore may not be suitable for imaging and drug delivery applications in cancer and other diseases affecting microvessels.

published proceedings

  • Langmuir

altmetric score

  • 35.5

author list (cited authors)

  • Namdee, K., Thompson, A. J., Charoenphol, P., & Eniola-Adefeso, O.

citation count

  • 103

complete list of authors

  • Namdee, Katawut||Thompson, Alex J||Charoenphol, Phapanin||Eniola-Adefeso, Omolola

publication date

  • February 2013