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. 1985 Jun;47(6):837–840. doi: 10.1016/S0006-3495(85)83987-4

Novel fluorescence method to visualize antibody-dependent hydrogen peroxide-associated "killing" of liposomes by phagocytes.

H R Petty, J W Francis
PMCID: PMC1435157  PMID: 4016201

Abstract

We have developed a new methodology to examine effector-cell-mediated immune attack using liposomes as targets. Hydrogen peroxide-associated killing of liposomes was observed with fluorescence intensification microscopy. Liposomes were composed of 98-99 mol % egg phosphatidylcholine and 1-2 mol % dinitrophenyl lipid hapten. Anti-dinitrophenyl IgG antibody was used to opsonize liposomes. Liposomes were loaded with dihydroxymandelic acid (DHMA) and peroxidase. Macrophage- or neutrophil-mediated recognition of liposomes triggers the release of H2O2 and other oxidative products. Upon interaction of H2O2 or OH radical with liposome contents, DHMA dimerizes forming a fluorescent derivative. Our studies indicate that individual living neutrophils and macrophages deposit oxidative products in a heterogenous fashion among bound targets.

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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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