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. 1999 Jul;77(1):587–596. doi: 10.1016/S0006-3495(99)76915-8

Mechanical anchoring strength of L-selectin, beta2 integrins, and CD45 to neutrophil cytoskeleton and membrane.

J Y Shao 1, R M Hochmuth 1
PMCID: PMC1300355  PMID: 10388783

Abstract

The strength of anchoring of transmembrane receptors to cytoskeleton and membrane is important in cell adhesion and cell migration. With micropipette suction, we applied pulling forces to human neutrophils adhering to latex beads that were coated with antibodies to CD62L (L-selectin), CD18 (beta2 integrins), or CD45. In each case, the adhesion frequency between the neutrophil and bead was low, and our Monte Carlo simulation indicates that only a single bond was probably involved in every adhesion event. When the adhesion between the neutrophil and bead was ruptured, it was very likely that receptors were extracted from neutrophil surfaces. We found that it took 1-2 s to extract an L-selectin at a force range of 25-45 pN, 1-4 s to extract a beta2 integrin at a force range of 60-130 pN, and 1-11 s to extract a CD45 at a force range of 35-85 pN. Our results strongly support the conclusion that, during neutrophil rolling, L-selectin is unbound from its ligand when the adhesion between neutrophils and endothelium is ruptured.

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Selected References

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