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- W2110028195 abstract "ABSTRACT Progressive granuloma formation is a hallmark of chronic mycobacterial infection. Granulomas are localized, protective inflammatory reactions initiated by CD4 + T cells, which contribute to control of bacterial growth and blockade of bacterial dissemination. In order to understand the costimulatory requirements that allow CD4 + T cells to directly or indirectly induce granulomas, we studied granuloma formation after 6 weeks in Mycobacterium bovis BCG-infected CD28- and CD40 ligand (CD40L)-deficient mice and compared it to granuloma formation in infected wild-type inbred mice and infected cytokine-deficient mice. We characterized granulomas morphologically in liver sections, analyzed granuloma infiltrating cells by flow cytometry, and measured cytokine production by cultured granuloma cells. CD28-deficient mice have no defect at the local inflammatory site, inasmuch as they form protective granulomas and control bacterial growth. However, there are fewer activated T cells in the spleen compared to infected wild-type animals, and quantitative differences in the cellular composition of the granuloma are observed by flow cytometry. In CD40L-deficient mice, the granuloma phenotype is very similar to the phenotype in gamma interferon (IFN-γ)-deficient mice. Both IFN-γ-deficient and CD40L-deficient mice form granulomas which prevent bacterial dissemination, but control of bacterial growth is significantly impaired. The relative proportion of CD4 + T cells in granulomas from both CD28 −/− and CD40L −/− mice is significantly decreased compared with wild-type animals. Both models demonstrate that the phenotype and activation stage of systemic T cells do not always correlate with the phenotype and activation stage of the localized granulomatous response." @default.
- W2110028195 created "2016-06-24" @default.
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- W2110028195 date "2001-04-01" @default.
- W2110028195 modified "2023-10-16" @default.
- W2110028195 title "Mycobacterium bovis BCG-Induced Granuloma Formation Depends on Gamma Interferon and CD40 Ligand but Does Not Require CD28" @default.
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- W2110028195 doi "https://doi.org/10.1128/iai.69.4.2596-2603.2001" @default.
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