Abstract
Macrophages from the gastrophod mollusk Otala lactea are capable of in vitro recognition and phagocytosis of foreign particles such as yeast, mammalian erythrocytes, and bacteria. The degree of intensity of the phagocytic response, in certain instances, is governed by the surface characteristics of the particle in question as well as by the presence of opsonic factors. Hemagglutinins have been implicated as opsonins in certain invertebrates, including mollusks. Otala lacks serum lectins; however, its hemolymph stimulates phagocytosis of formalized yeast but not erythrocytes and bacteria. Hemagglutinin-containing extracts of Otala albumin gland were shown to opsonize formalized red cells. The rate of ingestion of the bacteria used in this study by Otala hemocytes was variable and was not influenced by the presence of hemolymph in the medium.
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