Characterization of granuloma T lymphocyte function from Schistosoma mansoni-infected mice.
This study was undertaken to characterize and compare T lymphocyte function from the vigorous and modulated liver granulomas of Schistosoma mansoni-infected mice. Although both types of lesion contained equal percentages of T lymphocytes, the T cell subset distribution was different. For vigorous lesions, the ratio of helper/effector to suppressor/cytotoxic T cells was 2 to 3:1. For modulated lesions the ratio was lower (1:1). Differences in the phenotypic profiles of vigorous and modulated granuloma (Gr) T cells were reflected in their functional activity. Vigorous Gr T cells were more active in lymphoproliferation, IL-2 production, and granuloma formation than those from modulated lesions. Moreover, modulated Gr T cells suppressed the functional activity of vigorous Gr T cells in a dose-dependent manner. The selective depletion of T cell subsets showed that phenotypically, the Gr delayed-hypersensitivity T cell is L3T4+, Lyt-1+ whereas the Gr Ts cell is an Lyt-2+ lymphocyte. Both of these T cell subsets are present in vigorous and modulated lesions. During acute infection, delayed-hypersensitivity T cell lymphocyte functions predominate, whereas Ts lymphocyte functions appear to prevail during chronic infection.
Ragheb
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Department of Immunology and Microbiology, Wayne State University School of Medicine, Detroit, MI 48201.
Boros
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D000818:Animals; D000947:Antigens, Helminth / Q000276:immunology; D005260:Female; D006099:Granuloma / Q000276:immunology* / Q000469:parasitology; D007116:Immunization, Passive; D007376:Interleukin-2 / Q000096:biosynthesis; D008109:Liver Diseases, Parasitic / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D008808:Mice, Inbred CBA; D010063:Ovum / Q000276:immunology; D010641:Phenotype; D012555:Schistosomiasis mansoni / Q000276:immunology*; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology* / Q000637:transplantation; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
D000947:Antigens, Helminth; D007376:Interleukin-2