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. 1978 Jul;21(1):28–33. doi: 10.1128/iai.21.1.28-33.1978

Effects of surface-active agents on neutrophil receptors.

L A Boxer, S B Richardson, R L Baehner
PMCID: PMC421952  PMID: 30696

Abstract

An easily performed assay to identify the C3b and Fc receptors on human neutrophils was developed. Salmonella typhimurium were treated with fluorescein and then incubated in nonimmune fresh human serum, which led to C3b fixation via activation of the alternative pathway. Similarly, type II pneumococci were treated with fluorescein and opsonized with type-specific rabbit antiserum. Neutrophils bearing C3b and Fc receptors formed rosettes with the respective bacteria, which were easily readable because of their bright fluorescence. Incubation of neutrophils at 37 degrees C with C3-coated bacteria generated 54 +/ 4% C3b rosettes, whereas neutrophils incubated with immunoglobulin G-coated bacteria yielded 75 +/ 7% rosettes. Incubation at 4 degrees C inhibited the formation of C3b rosettes but not Fc rosettes. Heat inactivation of the fresh human serum at 56 degrees C for 30 min completely inhibited the formation of the C3b rosettes, and addition of heat-aggregated immunoglobulin G to the polymorphonuclear leukocyte blocked the ability of the polymorphonuclear leukocyte to bind immunoglobulin G-coated bacteria. Addition of 1.0 mM N-ethylmaleimide, 0.1 mg of trypsin per ml, 10 mM H2O2, O2- generated by xanthine-xanthine oxidase, and 8 times 10(-4) M hydrocortisone inhibited the C3b receptor, but did not inhibit the Fc receptor. In neutrophils, the selective effect of the various inhibitors suggests that the Fc and C3b receptors are distinct entities.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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