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Rotavirus Activates Lymphocytes from Non-Obese Diabetic Mice by Triggering Toll-Like Receptor 7 Signaling and Interferon Production in Plasmacytoid Dendritic Cells


Understanding how viruses contribute to type 1 diabetes development is vital for disease prevention. Infection of children at-risk of diabetes with the gastrointestinal pathogen rotavirus is associated with increased immune responses to pancreatic islets, leading to the proposal that rotavirus infection may accelerate progression to diabetes. In a mouse model, we showed previously that rotavirus accelerates diabetes onset, in conjunction with virus spread to the lymph nodes, draining the intestine and pancreas. At these sites, rotavirus associates with antigen-presenting cells of the immune system, including dendritic cells, leading to their maturation, and induces the activation of B and T cells. Here we use this mouse model to define the contribution of rotavirus-exposed antigen-presenting cells to the activation of neighboring B and T cells. We found that rotavirus-exposed dendritic cells induce B and T cell activation through secretion of type I interferon. Activation of these dendritic cells depends on recognition of viral RNA by Toll-like receptor 7. Our studies suggest that this mechanism of B and T cell activation may occur in RRV-infected mice and contribute to their accelerated diabetes development. A similar mechanism may be involved in the enhanced islet autoantibody responses of children following rotavirus infection.


Vyšlo v časopise: Rotavirus Activates Lymphocytes from Non-Obese Diabetic Mice by Triggering Toll-Like Receptor 7 Signaling and Interferon Production in Plasmacytoid Dendritic Cells. PLoS Pathog 10(3): e32767. doi:10.1371/journal.ppat.1003998
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1003998

Souhrn

Understanding how viruses contribute to type 1 diabetes development is vital for disease prevention. Infection of children at-risk of diabetes with the gastrointestinal pathogen rotavirus is associated with increased immune responses to pancreatic islets, leading to the proposal that rotavirus infection may accelerate progression to diabetes. In a mouse model, we showed previously that rotavirus accelerates diabetes onset, in conjunction with virus spread to the lymph nodes, draining the intestine and pancreas. At these sites, rotavirus associates with antigen-presenting cells of the immune system, including dendritic cells, leading to their maturation, and induces the activation of B and T cells. Here we use this mouse model to define the contribution of rotavirus-exposed antigen-presenting cells to the activation of neighboring B and T cells. We found that rotavirus-exposed dendritic cells induce B and T cell activation through secretion of type I interferon. Activation of these dendritic cells depends on recognition of viral RNA by Toll-like receptor 7. Our studies suggest that this mechanism of B and T cell activation may occur in RRV-infected mice and contribute to their accelerated diabetes development. A similar mechanism may be involved in the enhanced islet autoantibody responses of children following rotavirus infection.


Zdroje

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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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