PMID: 11918694Mar 29, 2002Paper

Distribution of IFN-gamma, IL-4 and TNF-alpha protein and CD8 T cells producing IL-12p40 mRNA in human lung tuberculous granulomas

Immunology
Gael FenhallsPauline T Lukey

Abstract

In order to examine the immune response at the site of pathology in tuberculosis, we analysed cytokines present in lung granulomas, their associations with each other and with caseous necrosis as well as the phenotype of the cellular infiltrate. Paraffin-embedded tissue from the lungs of seven patients with pulmonary tuberculosis was analysed by immunohistochemistry and in situ hybridization to detect interferon-gamma (IFN-gamma), tumour necrosis factor-alpha (TNF-alpha) and interleukin-4 (IL-4) proteins and IL-12p40 mRNA. All seven patients had granulomas staining positive for IFN-gamma, TNF-alpha and IL-12p40, but only four stained positive for IL-4. Cells with the morphology of lymphocytes, macrophages and giant cells expressed TNF-alpha, IFN-gamma and IL-4 protein. Furthermore, CD68-positive myeloid cells expressed IL-12p40 mRNA, as expected, but a subset of CD3-positive lymphocytes also expressed this mRNA. These lymphocytes producing IL-12p40 also stained positive for CD8 but not CD4. A total of 141 granulomas were scored for the presence or absence of cytokine or necrosis and two major associations were identified. The first association was between IFN-gamma and IL-12, with 76% of granulomas staining positive for both cy...Continue Reading

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