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Biomphalaria  snails may display varying levels of susceptibility to  Schistosoma mansoni  infection. We have been developing an  in vitro  model to study the interaction between the snail and the parasite, using tissue-derived cell cultures from  Biomphalaria .METHODS:   The digestive gland- and kidney-derived cells from primary cultures of resistant ( B. tenagophila  Taim) and susceptible ( B. tenagophila  HM and  B. glabrata  BH) strains of  Biomphalaria  were exposed to  S. mansoni  sporocysts.RESULTS:S. mansoni  sporocysts were surrounded and encapsulated exclusively by cells derived from the digestive gland (DG) of  B. tenagophila  Taim. The process was followed by a marked decrease in the number of free sporocysts in the culture medium. The morphological characteristics of DG-derived cells in culture have been described.CONCLUSIONS:   Cells derived from DG (but not SK) primary cultures of  B. tenagophila  Taim may participate in  S. mansoni  sporocyst control.

Interaction of Biomphalaria cells in primary cultures with Schistosoma mansoni sporocysts