Summary
The splenic macrophages of rats and mice were studied by light and fluorescence microscopy to determine their phagocytotic uptake of carbon and neutral polysaccharide (Fic-F), and their lysosomal enzyme activities. In rats, the large macrophages of the marginal zone (MZ) showed a moderate to strong acid phosphatase activity, and took up most of the Fic-F, even though they showed a weak phagocytotic activity to carbon particles. Red-pulp macrophages, however, ingested a large quantity of carbon particles, and are considered to be the major scavengers in the rat spleen. In contrast, the MZ macrophages in the mouse spleen were the major scavengers and showed a vigorous uptake of both carbon and Fic-F. In rats, the marginal metallophils (MM), located at the outer border of the periarterial lymphatic sheath and boundary between the MZ bridging channel and surrounding tissue, ingested Fic-F, whereas those located around the follicular area did not. In mice, on the other hand, the MM never ingested Fic-F. Lightly carbon-ladened small cells were constantly seen in the MZ of both rats and mice. They showed little acid phosphatase activity and did not ingest Fic-F. They were also present in the blood circulation.
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Matsuno, K., Fujii, H. & Kotani, M. Splenic marginal-zone macrophages and marginal metallophils in rats and mice. Cell Tissue Res. 246, 263–269 (1986). https://doi.org/10.1007/BF00215888
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DOI: https://doi.org/10.1007/BF00215888