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Infect. Immun., Apr 1996, 1351-1356, Vol 64, No. 4
Y Lin, M Zhang, FM Hofman, J Gong and PF Barnes
Depressed Th1 responses are a prominent feature of human tuberculosis, but
an enhanced Th2 response has not been detected in peripheral blood T cells
stimulated in vitro with Mycobacterium tuberculosis. In disease due to
Mycobacterium leprae, Th2 cells predominate in tissue lesions of patients
with extensive disease but are absent from peripheral blood. To determine
if Th2 cells are present in tissue lesions of tuberculosis patients, we
evaluated patterns of cytokine expression in lymph nodes from tuberculosis
patients with or without human immunodeficiency virus infection and in
controls without tuberculosis. Gamma interferon and interleukin-10 (IL-10)
mRNA expression in tuberculosis patients with or without human
immunodeficiency virus infection was high, whereas IL-4 expression in the
same patients was low. Immunolabeling studies showed that macrophage
production of IL-12 was increased in lymph nodes from tuberculosis
patients, that gamma interferon was produced by T cells, and that IL-10 was
produced by macrophages rather than Th2 cells. These results indicate that
Th2 responses are not enhanced either systemically or at the site of
disease in human tuberculosis.
Copyright © 1996, American Society for Microbiology
Absence of a prominent Th2 cytokine response in human tuberculosis
Division of Infectious Diseases, Department of Medicine, Los Angeles, California, USA.
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