title: Adhesive dynamics simulations of the mechanical shedding of L-selectin from the neutrophil surface.
abstract: Here we accurately recreate the mechanical shedding of L-selectin and its effect on the rolling behavior of neutrophils in vitro using the adhesive dynamics simulation by incorporating the shear-dependent shedding of L-selectin. We have previously shown that constitutively expressed L-selectin is cleaved from the neutrophil surface during rolling on a sialyl Lewis x-coated planar surface at physiological shear rates without the addition of exogenous stimuli. Utilizing a Bell-like model to describe a shedding rate which presumably increases exponentially with force, we were able to reconstruct the characteristics of L-selectin-mediated neutrophil rolling observed in the experiments. First, the rolling velocity was found to increase during rolling due to the mechanical shedding of L-selectin. When most of the L-selectin concentrated on the tips of deformable microvilli was cleaved by force exerted on the L-selectin bonds, the cell detached from the reactive plane to join the free stream as observed in the experiments. In summary, we show through detailed computational modeling that the force-dependent shedding of L-selectin can explain the rolling behavior of neutrophils mediated by L-selectin in vitro.
authors.affiliation: Department of Bioengineering, University of Pennsylvania, 19104, USA.
authors.forename: Dooyoung
authors.initials: D
authors.lastname: Lee
authors.forename: Kelly E
authors.initials: KE
authors.lastname: Caputo
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Hammer
authors.forename: Michael R
authors.initials: MR
authors.lastname: King
mesh_terms: D002448:Cell Adhesion / Q000502:physiology; D006801:Humans; D019041:L-Selectin / Q000378:metabolism* / Q000502:physiology; D036904:Leukocyte Rolling / Q000502:physiology; D040542:Mechanotransduction, Cellular / Q000502:physiology; D008955:Models, Cardiovascular; D009504:Neutrophils / Q000378:metabolism* / Q000502:physiology; D033081:Shear Strength / Q000502:physiology
chemical_list: D019041:L-Selectin