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Infect. Immun., Mar 1996, 913-918, Vol 64, No. 3
JH Gong, M Zhang, RL Modlin, PS Linsley, D Iyer, Y Lin and PF Barnes
To characterize the mechanism by which interleukin 10 (IL-10) inhibits Th1
responses to intracellular pathogens, we evaluated the interaction between
IL-10 and Mycobacterium tuberculosis-induced gamma interferon (IFN-gamma)
production by peripheral blood mononuclear cells from persons across the
spectrum of tuberculous infection. M. tuberculosis- induced IFN-gamma
production was highest in healthy tuberculin reactors, intermediate in
human immunodeficiency virus (HIV)-negative tuberculosis patients, and
lowest in HIV-infected tuberculosis patients. Neutralizing antibodies to
IL-10 increased IFN-gamma production in HIV-infected and HIV-negative
tuberculosis patients by enhancing monocyte IL-12 production. Expression of
the T-cell- costimulatory molecule CTLA-4 was depressed in M. tuberculosis-
stimulated peripheral blood mononuclear cells from tuberculosis patients,
and anti-IL-10 and Il-12 upregulated expression of CTLA-4. These findings
provide evidence that intracellular pathogens can inhibit Th1 responses and
downregulate expression of specific costimulatory molecules.
Copyright © 1996, American Society for Microbiology
Interleukin-10 downregulates Mycobacterium tuberculosis-induced Th1 responses and CTLA-4 expression
Department of Medicine, University of Southern California School of Medicine, Los Angeles, 90033, USA.
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