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- W40106520 abstract "Leukocyte integrins containing the common {beta}-subunit (CD18) mediate the adhesion of leukocytes to endothelial cells. It has been shown that the CD18 is phosphorylated in response to the phorbol ester PMA and proposed that phosphorylation of CD18 triggers the enhanced avidity of leukocyte integrins. The purpose of this study was to determine if CD18 in human neutrophils is also phosphorylated in response to physiological stimuli, i.e. receptor mediated activation. After labeling freshly isolated human neutrophils with {sup 32}p it was found that CD18 was phosphorylated in response to PMA in a time dependent manner that corresponded to the rate of PMA induced homotypic aggregation. The receptor mediated stimuli fMLP, LTB{sub 4}, IL-8, and C5a were also effective at initiating rapid CD18 dependent homotypic aggregation of neutrophils. However, in none of the receptor mediated responses was the level of CD18 phosphorylation increased at any time from the addition of stimuli to the peak of homotypic aggregation. Though not conclusive, this study suggests that in human neutrophils, activation of the leukocyte integrins by PMA may involve signaling pathways distinct from those involved in activation through receptor mediated stimulation." @default.
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- W40106520 date "1991-03-11" @default.
- W40106520 modified "2023-09-26" @default.
- W40106520 title "Phosphorylation of CD18 in response to neutrophil stimulation" @default.
- W40106520 hasPublicationYear "1991" @default.
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