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- W4313384911 abstract "Abstract Streptococcus pneumoniae (S. pneumoniae) is the leading cause of bacterial pneumonia in children and the elderly and it kills close to half a million children under 5 years old worldwide every year. Recent reports indicate that epithelial cells act not only as a physical barrier to pathogen invasion, but also as an extension of the immune system to prevent infection or eliminate pathogen. The herpes virus entry mediator (HVEM) is a member of the tumor necrosis factor (TNF) receptor super family. HVEM polymorphisms are a risk factor for several inflammatory and infectious diseases. Although lymphocytes and myeloid cells express HVEM, our previous data suggested that HVEM expression by epithelial cells was critical for innate immunity in the lung. However, the mechanism of HVEM-mediated host defense against S. pneumoniae is still unknown. To address the issue, we have analyzed mice with a lung epithelial cell-specific deletion of HVEM (Cc10-cre x Hvemfl/fl). We found that Cc10-cre x Hvemfl/fl mice were highly susceptible to S. pneumoniae, with an increased bacterial load by 24h and reduced survival. Mice treated with an antibody that blocks HVEM had a similar outcome, confirming that HVEM expression is required during the infection. HVEM has three ligands: the TNF super family member LIGHT and the Ig super family members BTLA and CD160. We determined that BTLA-deficient mice showed increased bacterial load in the lung and reduced survival, similar to HVEM deficiency. Moreover, CD11c-cre x BTLA fl/fl mice were highly susceptible to S. pneumoniae. Our data show that interaction between BTLA expressed by a CD11c positive myeloid cell type and HVEM expressed by lung epithelial cells leads to a protective innate response in the lung after infection." @default.
- W4313384911 created "2023-01-06" @default.
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- W4313384911 date "2017-05-01" @default.
- W4313384911 modified "2023-09-23" @default.
- W4313384911 title "HVEM-BTLA interactions stimulate lung innate immunity following <i>S. pneumoniae</i> infection." @default.
- W4313384911 doi "https://doi.org/10.4049/jimmunol.198.supp.77.14" @default.
- W4313384911 hasPublicationYear "2017" @default.
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