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. 1978 Dec;35(6):863–872.

Cellular requirements for the formation of EA rosettes by human monocytes.

J H Passwell, E Schneeberger, E Merler
PMCID: PMC1457450  PMID: 738764

Abstract

The binding of sensitized red cells to Fc receptors in human monocytes was studied by evaluating the effects of various pharmacological reagents and other treatments on EA rosette formation. Cytochalasin B and 2-deoxyglucose inhibited rosette formation in a dose-dependent manner. Sodium azide and incubation at 4 degrees also inhibited rosette formation, while at 37 degrees increased numbers of RBCs bound to the monocytes. The microtubular poisons, vinblastine and colchicine at high concentrations resulted in decreased adherence of monocytes and inhibition of rosette formation, while at low concentrations of colchicine, enhanced rosette formation was sometimes observed. Contrary to the effects on rosette formation, binding of [125I] IgG to monocyte monolayers was not altered by treatment of the monocytes with drugs. Magnesium ions were required to promote monocyte adherence, but both magnesium and calcium were needed for the best rosette formation. We conclude that the formation of EA rosettes is dependent not merely on binding of IgG to the Fc receptor but requires metabolically active monocytes, an intact cytostructure and suitable environmental conditions (temperature and cation concentration).

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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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