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Ultrastructural evidence for intracellular formation of amyloid fibrils in macrophages

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Summary

Early amyloid deposition in the spleen was studied by immunoelectron microscopy following the administration of rapid amyloid-inducing agents to mice.

Two days after the injection of an amyloidenhancing factor and casein solution, a small amount of amyloid material was observed at the border of the white pulp and the marginal zone (perifollicular area) and also within the white pulp. At this stage, amyloid fibrils were seen mainly in an extracellular distribution along the cytoplasmic processes of reticular cells and also in the cytoplasmic invaginations of macrophages. By immunoelectron microscopy, gold particles labelled fibrillar structures in lysosome-derived organelles in some macrophages as well as dense bodies consisted of a homogeneous, granular matrix not having any recognizable fibrillar structures. Similar immunolabelled organelles were also observed in the amyloid resorption stage, although, at that stage, they commonly contained other phagocytized materials as well.

From these findings, we suggest that at least some amyloid fibrils are polymerized in the cytoplasm of the macrophages by the proteolytic cleavage of previously pinocytized serum amyloid A protein (SAA).

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This work was supported by a Grant-in-Aid for Scientic Research of the Ministry of Education [C62570164] and a Research Grant for Scientific Disease from the Ministry of Health and Welfare

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Takahashi, M., Yokota, T., Kawano, H. et al. Ultrastructural evidence for intracellular formation of amyloid fibrils in macrophages. Vichows Archiv A Pathol Anat 415, 411–419 (1989). https://doi.org/10.1007/BF00747742

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  • DOI: https://doi.org/10.1007/BF00747742

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