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J. Exp. Med.,
Volume 187, Number 7, April 6, 1998 1145-1150
By
From the Department of Immunology, The Scripps Research Institute, La Jolla, California 92037
How strong adjuvants such as complete Freund's adjuvant (CFA) promote T cell priming to
protein antigens in vivo is still unclear. Since the unmethylated CpG motifs in DNA of bacteria and other nonvertebrates are stimulatory for B cells and antigen-presenting cells, the strong adjuvanticity of CFA could be attributed, at least in part, to the presence of dead bacteria, i.e., a
source of stimulatory DNA. In support of this possibility, evidence is presented that insect
DNA in mineral oil has even stronger adjuvant activity than CFA by a number of parameters.
Synthetic oligodeoxynucleotides (ODNs) containing unmethylated CpG motifs mimic the effects of insect DNA and, even in soluble form, ODNs markedly potentiate clonal expansion of
T cell receptor transgenic T cells responding to specific peptide.
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