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Mast cell phagocytosis of red blood cells.

The prevalence of mast cells infiltrating bone marrow of different rats varied widely, as did the staining properties and size of their cytoplasmic granules. Bone marrow mast cells from several rats revealed large membrane-limited inclusions which stained metachromatically or orthochromatically and resembled inclusions in some macrophages. Ultrastructurally, mast cells varied widely in content of uniform dense granules or enlarged granules with less dense, fine grained content. Some of the large inclusions observed ultrastructurally in mast cells were heterophagic vacuoles which contained erythrocytes or reticulocytes, or remnants from other phagocytized cells, possibly neutrophils or unidentified homogeneous material. Smaller bodies, interpreted as fragments of erythrocytes, lay extracellularly near mast cells and occupied small, membrane-limited, heterophagic vacuoles in some mast cells. In other mast cells, communal vacuoles enclosed several specific cytoplasmic granules in various stages of disruption. The communal vacuoles occasionally opened to the extracellular space. A few large indeterminate vacuoles in mast cells contained amorphous flocculent matter which apparently derived either from coalescence of cytoplasmic granules through fusion of granule membranes or from endocytosis.