dorsal/arxiv
View SchemaL-selectin mediated leukocyte tethering in shear flow is controlled by multiple contacts and cytoskeletal anchorage facilitating fast rebinding events
| Authors | Ulrich S. Schwarz, Ronen Alon |
|---|---|
| Categories | |
| ArXiv ID | q-bio/0504008 |
| URL | https://arxiv.org/abs/q-bio/0504008 |
| DOI | 10.1073/pnas.0305822101 |
| Journal | PNAS 101: 6940-6945 (2004) |
Abstract
L-selectin mediated tethers result in leukocyte rolling only above a threshold in shear. Here we present biophysical modeling based on recently published data from flow chamber experiments (Dwir et al., J. Cell Biol. 163: 649-659, 2003) which supports the interpretation that L-selectin mediated tethers below the shear threshold correspond to single L-selectin carbohydrate bonds dissociating on the time scale of milliseconds, whereas L-selectin mediated tethers above the shear threshold are stabilized by multiple bonds and fast rebinding of broken bonds, resulting in tether lifetimes on the timescale of $10^{-1}$ seconds. Our calculations for cluster dissociation suggest that the single molecule rebinding rate is of the order of $10^4$ Hz. A similar estimate results if increased tether dissociation for tail-truncated L-selectin mutants above the shear threshold is modeled as diffusive escape of single receptors from the rebinding region due to increased mobility. Using computer simulations, we show that our model yields first order dissociation kinetics and exponential dependence of tether dissociation rates on shear stress. Our results suggest that multiple contacts, cytoskeletal anchorage of L-selectin and local rebinding of ligand play important roles in L-selectin tether stabilization and progression of tethers into persistent rolling on endothelial surfaces.
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"abstract": "L-selectin mediated tethers result in leukocyte rolling only above a\nthreshold in shear. Here we present biophysical modeling based on recently\npublished data from flow chamber experiments (Dwir et al., J. Cell Biol. 163:\n649-659, 2003) which supports the interpretation that L-selectin mediated\ntethers below the shear threshold correspond to single L-selectin carbohydrate\nbonds dissociating on the time scale of milliseconds, whereas L-selectin\nmediated tethers above the shear threshold are stabilized by multiple bonds and\nfast rebinding of broken bonds, resulting in tether lifetimes on the timescale\nof $10^{-1}$ seconds. Our calculations for cluster dissociation suggest that\nthe single molecule rebinding rate is of the order of $10^4$ Hz. A similar\nestimate results if increased tether dissociation for tail-truncated L-selectin\nmutants above the shear threshold is modeled as diffusive escape of single\nreceptors from the rebinding region due to increased mobility. Using computer\nsimulations, we show that our model yields first order dissociation kinetics\nand exponential dependence of tether dissociation rates on shear stress. Our\nresults suggest that multiple contacts, cytoskeletal anchorage of L-selectin\nand local rebinding of ligand play important roles in L-selectin tether\nstabilization and progression of tethers into persistent rolling on endothelial\nsurfaces.",
"arxiv_id": "q-bio/0504008",
"authors": [
"Ulrich S. Schwarz",
"Ronen Alon"
],
"categories": [
"q-bio.SC"
],
"doi": "10.1073/pnas.0305822101",
"journal_ref": "PNAS 101: 6940-6945 (2004)",
"title": "L-selectin mediated leukocyte tethering in shear flow is controlled by multiple contacts and cytoskeletal anchorage facilitating fast rebinding events",
"url": "https://arxiv.org/abs/q-bio/0504008"
},
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