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M. Angela Montesano^*,, Daniel G. Colley, Silvana Eloi-Santos, George L. Freeman, Jr., and W. Evan Secor

From the ^* Departamento de Microbiologia, Immunologia e Parasitologia, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil 36036; the Division of Parasitic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services, Atlanta, Georgia 30341; and the Departamento de Propedèutica Complementar, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil 30190

Exposure to maternal idiotypes (Ids) or antigens might predispose a child to develop an immunoregulated, asymptomatic clinical presentation of schistosomiasis. We have used an experimental murine system to address the role of Ids in this immunoregulation. Sera from mice with 8-wk Schistosoma mansoni infection, chronic (20-wk infection) moderate splenomegaly syndrome (MSS), or chronic hypersplenomegaly syndrome (HSS) were passed over an S. mansoni soluble egg antigen (SEA) immunoaffinity column to prepare Ids (8WkId, MSS Id, HSS Id). Newborn mice were injected with 8WkId, MSS Id, HSS Id, or normal mouse immunoglobulin (NoMoIgG) and infected with S. mansoni 8 wk later. Mice exposed to 8WkId or MSS Id as newborns had prolonged survival and decreased morbidity compared with mice that received HSS Id or NoMoIgG. When stimulated with SEA, 8WkId, or MSS Id, spleen cells from mice neonatally injected with 8WkId or MSS Id produced more interferon than spleen cells from mice neonatally injected with HSS Id or NoMoIgG. Furthermore, neonatal exposure to 8WkId or MSS Id, but not NoMoIgG or HSS Id, led to significantly smaller granuloma size and lower hepatic fibrosis levels in infected mice. Together, these results indicate that perinatal exposure to appropriate anti-SEA Ids induces long-term effects on survival, pathology, and immune response patterns in mice subsequently infected with S. mansoni.

Key Words: schistosomiasis • idiotypes • granuloma • splenomegaly • mice

Abbreviations used: CCA, circulating cathodic antigen; CRI, cross-reactive Id; HSS, hypersplenomegaly syndrome; Id, idiotype; MSS, moderate splenomegaly syndrome; NoHuIgG, normal human Ig; NoMoIgG, normal mouse Ig; SEA, schistosome soluble egg antigen(s); SWAP, schistosome adult worm antigenic preparation.

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