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- W90181130 abstract "Previous investigations of the C5a receptor have been performed using intact human PMNL. To circumvent some of the potential problems with such whole cell assays (e.g. internalization or metabolism of radioligand) the authors have developed a PMNLM binding assay. Human PMNLM were prepared by nitrogen cavitation and Percoll gradient centrifugation. Specific binding of (/sup 125/I)C5a to PMNLM was: high affinity, K/sub D/ = 0.6 nM; saturable, B/sub max/ = 8.7 pmol/mg protein; and reversible. Kinetic measurements agree with the K/sub D/ value obtained by Scatchard analysis. Furthermore, the binding activity of C5a correlates with biological activity as measured by myeloperoxidase release from human PMNL. Human serum C5a and recombinant C5a bind with similar affinities when measured by competition or direct binding and label the same number of sites in human PMNLM. The nonhydrolyzable GTP analog, GppNHp, induces a low affinity state of the C5a receptor (4-6 fold shift in K/sub D/) with little effect on B/sub max/. In summary, the criteria have been satisfied for identification of a biologically relevant C5a binding site in human PMNLM. Regulation of the C5a receptor and its membrane transduction mechanism(s) appears to involve guanyl nucleotides, as has been found for other chemoattractant receptors." @default.
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- W90181130 date "1986-05-01" @default.
- W90181130 modified "2023-09-23" @default.
- W90181130 title "C5a binding to human polymorphonuclear leukocyte plasma membrane (PMNLM) receptors" @default.
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