In the US, Toxoplasma gondii is the second leading cause of food borne mortality and more than 60 million people are persistently infected with this organism and this infection is a concern in many patients with primary or acquired defects in T cell mediated immunity. Due to the ease of transmission and its ability to cause severe disease, T. gondii is classified as a Class B Biodefense pathogen. The ability to balance the development of protective and pathological immunity is key in determining the outcome of this infection. This proposal studies the role of the cytokine IL-27 in controllinga unique population of regulatory T cells to limit inflammation and is broadly applicable to understanding how this cytokine may be useful as a therapy.

Public Health Relevance

Toxoplasma is a common opportunistic infection in patients with defects in T cell function and can cause significant disease in immune competent individuals. The ability to control the inflammatory response to this infection is essential to limt collateral damage and key to host cell survival. The overall goal of this proposal is to understand how the cytokine IL-27 controls the inflammatory response with the overarching goal of developing therapies that are useful to modulate the immune system.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
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Special Emphasis Panel (ZRG1-IMM-N (03))
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Lapham, Cheryl K
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University of Pennsylvania
Schools of Veterinary Medicine
United States
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DeLong, Jonathan H; Hall, Aisling O'Hara; Konradt, Christoph et al. (2018) Cytokine- and TCR-Mediated Regulation of T Cell Expression of Ly6C and Sca-1. J Immunol 200:1761-1770
Konradt, Christoph; Hunter, Christopher A (2018) Pathogen interactions with endothelial cells and the induction of innate and adaptive immunity. Eur J Immunol 48:1607-1620
O'Brien, Carleigh A; Overall, Christopher; Konradt, Christoph et al. (2017) CD11c-Expressing Cells Affect Regulatory T Cell Behavior in the Meninges during Central Nervous System Infection. J Immunol 198:4054-4061
Muallem, Gaia; Wagage, Sagie; Sun, Yan et al. (2017) IL-27 Limits Type 2 Immunopathology Following Parainfluenza Virus Infection. PLoS Pathog 13:e1006173
Glatman Zaretsky, Arielle; Konradt, Christoph; D├ępis, Fabien et al. (2017) T Regulatory Cells Support Plasma Cell Populations in the Bone Marrow. Cell Rep 18:1906-1916
Klein, Robyn S; Hunter, Christopher A (2017) Protective and Pathological Immunity during Central Nervous System Infections. Immunity 46:891-909
Silver, Jonathan S; Kearley, Jennifer; Copenhaver, Alan M et al. (2016) Inflammatory triggers associated with exacerbations of COPD orchestrate plasticity of group 2 innate lymphoid cells in the lungs. Nat Immunol 17:626-35
Pritchard, Gretchen Harms; Cross, Eric W; Strobel, Marjorie et al. (2016) Spontaneous partial loss of the OT-I transgene. Nat Immunol 17:471
Wagage, Sagie; Harms Pritchard, Gretchen; Dawson, Lucas et al. (2015) The Group 3 Innate Lymphoid Cell Defect in Aryl Hydrocarbon Receptor Deficient Mice Is Associated with T Cell Hyperactivation during Intestinal Infection. PLoS One 10:e0128335
Hirahara, Kiyoshi; Onodera, Atsushi; Villarino, Alejandro V et al. (2015) Asymmetric Action of STAT Transcription Factors Drives Transcriptional Outputs and Cytokine Specificity. Immunity 42:877-89

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