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Mice with severe combined immunodeficiency (SCID mice) lack functional B and T cells. Egg laying by Schistosoma mansoni and S. japonicum was delayed in SCID mice, but in a matter of weeks worm fecundity was equivalent to that in intact mice. SCID mice formed smaller hepatic granulomas and showed less fibrosis than did intact mice. The reduction in egg-associated pathology in SCID mice correlated with marked reductions in interleukin-4 (IL-4), IL-5, IL-13, and gamma interferon mRNA expression in the liver. S. mansoni infections were frequently lethal for SCID mice infected for more than 9 weeks, while S. japonicum-infected SCID mice died at the same rate as infected intact mice. We were unable to affect hepatic granuloma formation or egg laying by worms in SCID mice by administration of recombinant murine tumor necrosis factor alpha (TNF-alpha). In fact, SCID and BALB/c mice appeared to express nearly equivalent levels of TNF-alpha mRNA in their granulomatous tissues, suggesting that there is little or no deficit in TNF-alpha expression in infected SCID mice. The data indicate that TNF-alpha may be in large part derived from a non-T-cell source. Together, these findings provide little evidence that TNF-alpha alone can reconstitute early fecundity, granuloma formation, or hepatic fibrosis in schistosome-infected SCID mice.

infection and immunity

Egg Laying Is Delayed but Worm Fecundity Is Normal in SCID Mice Infected with<i>Schistosoma japonicum</i>and<i>S. mansoni</i>with or without Recombinant Tumor Necrosis Factor Alpha Treatment

Egg Laying Is Delayed but Worm Fecundity Is Normal in SCID Mice Infected withSchistosoma japonicumandS. mansoniwith or without Recombinant Tumor Necrosis Factor Alpha Treatment