Enzyme synthesis

Since the original description of macrophages in the nineteenth century, it has been known that the cytoplasmic granules of activated macrophages take up more of the dye neutral red than do those of nonacti-vated macrophages. Neutral red is a basic dye that is specific for the enzyme components of macrophage granules. Procedures in histochemistry, coupled with the more sophisticated techniques of electron microscopy, have revealed that acid phosphatase is abundant in the lysosomes of macrophages. These protein enzymes in lysosomes are actively synthesized by macrophages. After the fusion of a phagosome (which forms immediately after phagocytosis) with a lysosome, enzymes are discharged into the resulting phagolysosome, A residual body consisting of digested material is formed and is then extruded by exocytosis.

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