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. 1986 Jan;77(1):27–33. doi: 10.1172/JCI112286

Excessive binding of natural anti-alpha-galactosyl immunoglobin G to sickle erythrocytes may contribute to extravascular cell destruction.

U Galili, M R Clark, S B Shohet
PMCID: PMC423303  PMID: 3944254

Abstract

A large proportion of sickle erythrocytes is removed from the circulation by the macrophages of the reticuloendothelial system. In view of the proposed role for natural antibodies in the destruction of normal senescent erythrocytes, we looked for a possible similarity in the antibodies that bind in situ to senescent and sickle cells. Bound IgG molecules were detected by a highly sensitive rosetting antiglobulin test, using K562 myeloid cells. After separation on Stractan density gradients, the 0.6% most dense (senescent) normal cells and the most dense 40% sickle cells displayed membrane-bound IgG as reflected by the high proportion of rosettes formed. No antibody was found on low-density cells of either type. The bound antibodies were readily eluted from both sickle and normal senescent cells by carbohydrates containing alpha-galactosyl residues. These antibodies appear identical to the recently discovered human natural anti-alpha-galactosyl IgG (anti-Gal), an IgG antibody present in high titers in normal sera. Moreover, affinity-purified anti-Gal interacted specifically with sickle and normal cells depleted of the autologous antibodies. A similar pattern of binding to the various erythrocyte subpopulations was observed when the radiolabeled lectin with anti-alpha-galactosyl specificity, Bandeiraea simplicifolia, was used. In vitro phagocytosis of normal and sickle erythrocyte subpopulations correlated with the presence of anti-Gal on these cells. The in situ binding of anti-Gal to a large proportion of sickle erythrocytes may reflect an accelerated physiologic aging process by which immune recognition of prematurely exposed alpha-galactosyl-bearing antigenic sites contributes to shortened cell survival.

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Selected References

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