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Laboratory of Mycobacteria, Division of Bacterial Products,
Laboratory of Enteric and Sexually Transmitted Diseases, Division of Bacterial Products, and
Retroviral Immunology Section, Laboratory of Retrovirology, Division of Viral Products, Center for Biologics Evaluation and Research, Rockville, MD 20852
Bacterial DNA containing unmethylated CpG motifs activates
mammalian lymphocytes and macrophages to produce cytokines and
polyclonal Ig. These include IFN-
, IL-12, TNF-
, and IL-6, which
are important in the control of intracellular bacterial infection.
Here, we show that bacterial DNA, as well as synthetic oligonucleotides
containing CpG motifs, induce protection against large lethal doses of
Francisella tularensis live vaccine strain (LVS) and
Listeria monocytogenes. Methylation of DNA at CpG
dinucleotides or inversion of the motif abolished this protection.
Surprisingly, DNA-mediated protection was highly dependent on
lymphocytes, particularly B cells, as well as the production of
IFN-
. Optimal protection was elicited 23 days after inoculation
with DNA and persisted for up to 2 wk. Further, animals surviving
lethal challenge developed pathogen-specific secondary immunity. These
findings indicate that host innate immune responses to bacterial DNA
may contribute to the induction of protective immunity to bacteria and
the subsequent development of memory.
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