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Infection and Immunity, November 1999, p. 5658-5663, Vol. 67, No. 11
0019-9567/99/$04.00+0
Repeated Administration of Synthetic
Oligodeoxynucleotides Expressing CpG Motifs Provides Long-Term
Protection against Bacterial Infection
Dennis M.
Klinman,*
Jackie
Conover, and
Cevahir
Coban
Section of Retroviral Immunology, Center for
Biologics Evaluation and Research, Food and Drug Administration,
Bethesda, Maryland
Received 24 May 1999/Returned for modification 29 June
1999/Accepted 9 August 1999
Synthetic oligodeoxynucleotides (ODN) expressing unmethylated CpG
motifs stimulate an innate immune response characterized by the
production of polyreactive immunoglobulin M antibodies and
immunomodulatory cytokines. This immune response has been shown to
protect mice from challenge by Listeria monocytogenes and
Francisella tularensis for up to 2 weeks. By repeatedly
administering CpG ODN two to four times/month, we found that this
protection could be maintained indefinitely. Protection was associated
with a significant increase in the number of spleen cells that could be
triggered by subsequent pathogen exposure to secrete gamma interferon
and interleukin-6 in vivo (P < 0.01). ODN-treated
animals remained healthy and developed neither macroscopic nor
microscopic evidence of tissue damage or inflammation. Thus, repeated
administration of CpG ODN may provide a safe means of conferring
long-term protection against infectious pathogens.
*
Corresponding author. Mailing address: Bldg. 29A Rm. 3 D 10, CBER/FDA Bethesda, MD 20892. Phone: (301) 827-1707. Fax: (301) 496-1810. E-mail: Klinman{at}CBER.FDA.GOV.
Infection and Immunity, November 1999, p. 5658-5663, Vol. 67, No. 11
0019-9567/99/$04.00+0
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