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PubMed1975

Genetic studies of pathologic conditions and susceptibility to infection in Biomphalaria glabrata.

During studies on the genetics of variation in susceptibility of B. galbrata to infection with S. mansoni, four types of proliferative amoebocytic accumulations have been observed. They occur in four different clonal stocks of B. glabrata, beginning as amoebocytic aggregations, namely, in the atrial cavity, pericardial cavity, periaortic space, and hemocoel between the stomach and intestine. Persistent amoebocytic accumulations involve the sinuses around the stomach, intestine, and hepatopancreas. In these snails, nests of undifferentiated cells occur in the anterior pericardial wall, which is considered to be a hemopoietic area. Crossing experiments indicate the involvement of genetic factors, possibly in combination with infectious agents.

Animals↗
PubMed1975

In vitro cultivation of cells and a microsporidian parasite of Biomphalaria glabrata (Pulmonata: Basommatophora).

Cells from juvenile heart and gonads of B. glabrata have been grown in vitro for more than 1 year. These cell cultures are not actively mitotic but show other characteristics normal for metazoan cells in culture. They are tolerant of widely variable culture conditions. Challenges with mitogens, mutagens, and altered cyclic nucleotide levels have failed to induce mitosis. A microsporidian parasite grows intracellularly in vitro. The ultrastructural details of sporogeny and pansporoblastic maturation are described. Several pansporoblasts can occur in one snail cell; maturation of spores within a pansporoblast is not synchronous, which is a highly unusual feature. Time-lapse cinemicrography reveals engulfment of free spores by snail cells. Polar tube and sporoplasm release are reported photographically. Drug therapy failed to eliminate the protozoan. The potential value of microsporidia in schistosome control programs is evaluated as slight.

Animals↗