Abstract
Excretory-secretory (E-S) products contained in supernatants from in vitro cultured Schistosoma mansoni primary sporocysts were assayed for their effects on the in vitro motility of Biomphalaria glabrata hemocytes. Both whole (unfractionated) and fractionated E-S products were tested in modified Boyden chemotaxis chambers. E-S product fractionation was accomplished using both membrane ultrafiltration (MF) and high-pressure liquid chromatography (HPLC). Transformation (Tr) products, but not those products released by 8-day sporocysts, significantly inhibited the random motility of hemocytes from an S. mansoni susceptible strain (M-Line) of B. glabrata. This activity was found in both high and low MF fractions of Tr but not in an intermediate MF fraction. In an effort to isolate the active component(s) of the high MF fraction, HPLC was used to separate components based on size exclusion. Although each of four HPLC fractions displayed some inhibitory activity, the greatest consistent activity was found in fraction 3, which was composed, predominantly, of a 108-kDa protein. In contrast to the response of M-Line cells to Tr E-S products, the motility of hemocytes from an S. mansoni-resistant strain (10-R2-OK) of B. glabrata was not significantly reduced from controls. The high MF fraction, however, elicited a slight positive chemokinetic response, while the low MF fraction reduced 10-R2-OK hemocyte motility slightly but not significantly. While three HPLC fractions significantly reduced 10-R2-OK hemocyte motility, this effect was significantly less than that produced by the same HPLC fractions on M-Line hemocyte motility. These data suggest that S. mansoni sporocyst Tr E-S products differentially affect the random motility of M-Line and 10-R2-OK snail hemocytes. Although the significance of this differential effect on the in vivo defenses of B. glabrata is not known, it could be important in the host-parasite interaction which leads to either resistance or susceptibility.
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