2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN (TCDD) REDUCES LEISHMANIA MAJOR BURDENS IN C57BL/6 MICE

OWEN J. BOWERS Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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KIRSA B. SOMMERSTED Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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RYAN T. SOWELL Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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GRETCHEN E. BOLING Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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WILLIAM H. HANNEMAN Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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RICHARD G. TITUS Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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GREGORY K. DEKREY Department of Medicine, University of Colorado at Denver and Health Sciences Center, Denver, Colorado; Department of Biological Sciences, College of Natural and Health Sciences, University of Northern Colorado, Greeley, Colorado; Department of Immunology, University of Texas, Graduate School of Biomedical Sciences at Houston, Houston, Texas; Department of Environmental and Radiological Health Sciences and Department of Microbiology, Immunology and Pathology, College of Veterinary and Biomedical Sciences, Colorado State University, Fort Collins, Colorado

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Acute exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) can suppress adaptive immunity. In this study, pre-exposure of Leishmania major–infected mice to TCDD caused a dose-dependent and unexpected decrease in parasite burdens on day 20 after infection. In contrast, TCDD-mediated lymphoid atrophy, suppressed antibody levels, and enhanced interleukin-2 production were observed as expected. These results suggest that TCDD may enhance resistance to L. major in the face of immune suppression.

Author Notes

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