Fine Structural Localization of Acid Phosphatase in Granulocytes of the Pelecypod Mercenaria mercenaria

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Abstract
Acid phosphatase (EC 3.1.3.2, orthophosphoric monoester phosphohydrolase) activity within electron-opague, membrane-bound vesicles of M. mercenaria granulocytes was localized by employing cytochemistry at the light and electron microscope levels. These vesicles can be considered lysosomes. They presumably function, at least in part, as storage organelles for acid hydrolases, and are therefore analogous to the granules in mammalian polymorphonuclear and monocytic leukocytes. Lysosomes containing acid phosphatase are probably the sources of this enzyme found in cellular and serum fractions of the hemolymph of M. mercenaria, although the mechanism for enzyme release remains uncertain.

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