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. 1985 May;55(1):97–103.

Erythrocyte enhancement of C3b-mediated phagocytosis by human neutrophils in vitro: a combined effect of the erythrocyte complement receptors CR1 and erythrocyte scavengers to reactive oxygen metabolites (ROM).

J Forslid, J Hed, O Stendahl
PMCID: PMC1453591  PMID: 3158597

Abstract

Human erythrocyte CR1 receptors have been shown to bind complement-fixing immune complexes and, thus, facilitate their elimination from the circulation. The autotoxic effect of free radicals released from phagocytes during phagocytosis can be alleviated by scavengers like catalase and superoxide dismutase. Erythrocytes are known to contain these antioxidants. This study showed that 74% of opsonized yeast particles adhered to human erythrocytes. No difference was seen between yeast opsonized with C3b and yeast opsonized with both IgG and C3b. This adherence was due to the C3b receptor (CR1), as monoclonal antibodies against the CR1 receptor could abrogate the adherence. The yeast phagocytosis by neutrophils was increased by 15% when yeast-C3b was used, and by 34% when yeast-IgG/C3b was used in the presence of human red blood cells. The increase of phagocytosis was not seen when rat erythrocytes (lacking CR1) were present. The cytochrome c reduction decreased with the presence of human erythrocytes during phagocytosis, indicating a scavenging effect on the superoxide anions. The addition of scavengers or erythrocyte lysate, instead of erythrocytes, enhanced phagocytosis of yeast-IgG/C3b to at least the same extent as the erythrocytes. These observations suggest that human erythrocytes primarily enhance phagocytosis through the scavenging effect of those erythrocytes which are concurrently attached with the prey through its CR1 receptor, and then attached to the PMN.

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Selected References

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