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- W2072804932 abstract "In the present study we describe the expression and functional activity of the α4β1 heterodimer molecule on human natural killer (NK) cells. Flow cytometric analyses showed that fresh and activated NK cells expressed high levels of very late activation antigen-4 (VLA-4) molecules. These cells bound to fibronectin (FN) and to its 38 000-MW proteolytic fragment through the VLA-4 integrin that was blocked with HP2/1 anti-α4 monoclonal antibodies (mAbs) and with the FN peptide fragment CS1. No inhibitory effects were observed in the presence of anti-α5 mAb, FN peptide fragment CS2 or other irrelevant mAb. Fresh NK cells were unable to aggregate, despite their expression of VLA-4, and only activated (cultured and lymphocyte-activated killer cells) NK cells showed homotypic aggregation with HP1/7 and HP2/4 anti-α4 mAb related to cellular activation. These results underline new evidence of how NK cells in different states of activation maintain different constitutive levels of α4β1 integrin activity, and highlight the possibility of a different functional regulation by the cells bearing VLA-4, in the expression of these epitopes and their ability to interact with their ligands." @default.
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- W2072804932 date "2000-05-01" @default.
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- W2072804932 title "Expression and functional activity of the very late activation antigen-4 molecule on human natural killer cells in different states of activation" @default.
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- W2072804932 doi "https://doi.org/10.1046/j.1365-2567.2000.00994.x" @default.
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