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- W2018125594 abstract "Fractalkine is a unique chemokine possessing a long mucin-like stalk and a transmembrane region that has been proposed to act as an adhesion molecule. We investigated the ability of fractalkine to recruit leukocytes from whole blood, using an immobilized fractalkine fusion protein in the parallel-plate flow-chamber assay. Significant adhesion of leukocytes to fractalkine peaked at 2 dynes/cm(2) but was minimal at 10 dynes/cm(2). In contrast, VCAM-1 could recruit cells from whole blood at 10 dynes/cm(2). Co-immobilization of fractalkine and VCAM-1 at 10 dynes/cm(2) resulted in a twofold increase in adherent cells compared with VCAM-1 alone, suggesting that fractalkine can mediate adhesion at high shear if combined with a molecule that can mediate leukocyte tethering. Pretreatment of blood with pertussis toxin eliminated this increase in adhesion, implicating intracellular signaling in fractalkine-mediated mechanisms of adhesion to co-immobilized fractalkine/VCAM-1. Analysis of the cell types recruited to fractalkine alone at low shear, or to fractalkine and VCAM-1 at 10 dynes/cm(2), revealed that monocytes were recruited to fractalkine with the highest specificity. In conclusion, fractalkine is unlikely to act alone at shear forces found in most vascular beds where it most likely co-operates with tethering molecules, e.g. VCAM-1, in the recruitment of monocytes." @default.
- W2018125594 created "2016-06-24" @default.
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- W2018125594 date "2003-03-01" @default.
- W2018125594 modified "2023-09-25" @default.
- W2018125594 title "Human fractalkine mediates leukocyte adhesion but not capture under physiological shear conditions; a mechanism for selective monocyte recruitment" @default.
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- W2018125594 doi "https://doi.org/10.1002/eji.200323502" @default.
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