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. 1968 Oct 31;128(5):1059–1079. doi: 10.1084/jem.128.5.1059

THE SUBCELLULAR DISTRIBUTION OF ANTIGEN IN MACROPHAGES

E Kölsch 1, N A Mitchison 1
PMCID: PMC2138563  PMID: 5682940

Abstract

The intracellular fate of phagocytosed antigens in cells from peritoneal exudate in CBA mice has been studied by using 126I and 131I labeled antigens. After uptake of labeled antigen, cells were homogenized and the subcellular fractions were analyzed by isopycnic centrifugation in a sucrose gradient. The uptake of heat-denatured BSA (c BSA) by these cells in vivo is 3.5 µg/mg c BSA injected/108 cells. The uptake by cells in animals which were exposed 2 days earlier to 900 r whole body irradiation is slightly lower but does not differ significantly. 90% of the phagocytosed material is degraded within 2–3 hr, the residual 10% is retained at least over an 8 hr periods. Using a pulse and chase technique, with 125I and 131I c BSA in vitro and in vivo it was shown that newly phagocytosed antigen is found mainly in a lysosomal turnover compartment of a density 1.19 g cm–3. Antigen which has been in the cells for longer was found in a denser fraction (1.26 g cm–3). In a comparison of nhrmal and X-irradiated cells it can be shown that after irradiation with 900 r less c BSA is found in this storage compartment. Binding of the antigen to the subcellular fractions, and its behavior towards several detergents has been studied. Subcellular fractions do not have the increased immunogenic capacity of antigen enclosed in living macrophages. Two synthetic polypeptide antigens, poly(D-Tyr, D-Glu, D-Ala) and poly-(L-Tyr, L-Glu) have a different subcellular distribution from c BSA, BSA, or bovine gamma globulin. Apart from also being found in the 1.26 storage compartment the polypeptide antigens are mainly located in a 1.15 compartment and only to a small extent in the 1.19 compartment. The half-life of these antigens in the cells is much longer than the half-life of the protein antigens studied. The finding of several subcellular compartments is discussed in connection with the functions possibly performed by macrophages.

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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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