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Deutsches Rheumaforschungszentrum, Berlin, Germany;
Genetics Institute, Cambridge, MA 02140; and
Medizinische Klinik m.S. Rheumatologie/Klinische Immunologie, Universitätsklinikum Charité, Berlin, Germany
Naive Th cells can be directed in vitro to develop into Th1 or Th2
cells by IL-12 or IL-4, respectively. In vivo, chronic immune reactions
lead to polarized Th cytokine patterns. We found earlier that
Borrelia burgdorferi, the spirochaete that causes Lyme
disease, induces Th1 development in 
TCR-transgenic Th cells.
Here, we used TCR-transgenic Th cells and oligonucleotide arrays to
analyze the differences between Th1 cells induced by IL-12 vs those
induced by B. burgdorferi. Transgenic Th cells primed
with peptide in the presence of B. burgdorferi expressed
several mRNAs, including the mRNA encoding IL-17, at significantly
higher levels than Th cells primed with peptide and IL-12. Cytometric
single-cell analysis of Th cell cytokine production revealed that IL-17
cannot be categorized as either Th1 or Th2 cytokine. Instead, almost
all IL-17-producing Th cells simultaneously produced TNF-
and most
IL-17+ Th cells also produced GM-CSF. This pattern was also
observed in humans. Th cells from synovial fluid of patients with Lyme
arthritis coexpressed IL-17 and TNF-
upon polyclonal stimulation.
The induction of IL-17 production in Th cells is not restricted to
B. burgdorferi. Priming of TCR-transgenic Th cells in
the presence of mycobacterial lysates also induced IL-17/TNF-
coproduction. The physiological stimulus for IL-17 production was
hitherto unknown. We show here for the first time that microbial
stimuli induce the expression of IL-17 together with TNF-
in both
murine and human T cells. Chronic IL-17 expression induced by microbes
could be an important mediator of infection-induced
immunopathology.
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