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Laboratories of
*
Immunology and
Bacteriology and Medical Mycology, Istituto Superiore di Sanità, Rome, Italy; and
Department of Virology, National Public Health Institute, Helsinki, Finland
Macrophages and dendritic cells (DC) play an essential role in the
initiation and maintenance of immune response to pathogens. To analyze
early interactions between Mycobacterium tuberculosis
(Mtb) and immune cells, human peripheral blood monocyte-derived
macrophages (MDM) and monocyte-derived dendritic cells (MDDC) were
infected with Mtb. Both cells were found to internalize the
mycobacteria, resulting in the activation of MDM and maturation of MDDC
as reflected by enhanced expression of several surface Ags. After Mtb
infection, the proinflammatory cytokines TNF-
, IL-1, and IL-6 were
secreted mainly by MDM. As regards the production of IFN-
-inducing
cytokines, IL-12 and IFN-
, was seen almost exclusively from infected
MDDC, while IL-18 was secreted preferentially by macrophages. Moreover,
Mtb-infected MDM also produce the immunosuppressive cytokine IL-10.
Because IL-10 is a potent inhibitor of IL-12 synthesis from activated
human mononuclear cells, we assessed the inhibitory potential of this
cytokine using soluble IL-10R. Neutralization of IL-10 restored IL-12
secretion from Mtb-infected MDM. In line with these findings,
supernatants from Mtb-infected MDDC induced IFN-
production by T
cells and enhanced IL-18R expression, whereas supernatants from MDM
failed to do that. Neutralization of IFN-
, IL-12, and IL-18 activity
in Mtb-infected MDDC supernatants by specific Abs suggested that IL-12
and, to a lesser extent, IFN-
and IL-18 play a significant role in
enhancing IFN-
synthesis by T cells. During Mtb infection,
macrophages and DC may have different roles: macrophages secrete
proinflammatory cytokines and induce granulomatous inflammatory
response, whereas DC are primarily involved in inducing
antimycobacterial T cell immune response.
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