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Institute for Medical Microbiology, Immunology and Hygiene, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany
Infections can influence concurrent and subsequent Th1 vs Th2
immune responses to Ags. Through pattern recognition of foreign
unmethylated CpG dinucleotides, the vertebrate innate immune system can
sense infectious danger and typically replies with a Th1-polarized
adaptive immune response. We examined whether CpG-DNA exposure would
influence subsequent responses to infection and soluble Ags. CpG-DNA
injection led to local lymphadenopathy characterized by maintenance of
cellular composition with some biasing toward elevated dendritic cell
composition. Sustained local production of IL-12 and IFN-
from
dendritic cells and T cells was shown. Prior injection by up to 2 wk
with CpG-DNA protected BALB/c mice from Th2 driven lethal
leishmaniasis. CpG-DNA injection by up to 5 wk before soluble Ag
challenge resulted in the generation of Ag-specific CTL, Th1 recall
responses to Ag, and Th1-polarized Ag-specific Abs. Thus, CpG-DNA
instigated a local predisposition for intense CTL responses and
Th1-polarized immune responses to subsequent infections or Ag
challenge. The induction by the innate immune system of a locally
contained hypersensitivity could represent a capacitating immune
reaction yielding rapid conditioned responses to secondary
infections.
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