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Title

CpG oligodeoxynucleotides can circumvent the Th2 polarization of neonatal responses to vaccines but may fail to fully redirect Th2 responses established by neonatal priming

Authors
Bozzotti, P
Love-Homan, L
Davis, HL
Krieg, AM
Published in Journal of Immunology. 1999, vol. 162, no. 3, p. 1611-7
Abstract Neonatal murine responses to a panel of conventional vaccines differ qualitatively from adult responses by a particular polarization toward a Th2 pattern and a frequent limitation of the Th1 and CTL responses required for protection against intracellular microorganisms. In contrast, DNA vaccines induce adult-like Th1/CTL neonatal responses against the same vaccine Ags. In this report, we show that this can be related to their content in unmethylated CpG motifs. Oligodeoxynucleotides (ODN) containing CpG motifs activate neonatal APCs to produce IL-12 in vitro and induce adult-like Th1 responses to tetanus toxoid and measles Ags in vivo, with production of IgG2a-specific Abs and adult-like secretion of IFN-gamma and IL-5 by Ag-specific T cells. However, in spite of their capacity to trigger neonatal B cell proliferation in vitro, CpG-ODN only partially enhanced early life Ab responses. Finally, using Th1-driving CpG-ODN with the boosting dose of a protein vaccine was sufficient to redirect adult but not neonatally primed Th2 responses. These observations could be important for the development of novel vaccines that will have to be effective early in life.
Keywords AnimalsAnimals, NewbornB-Lymphocytes/immunologyBase SequenceCpG IslandsMiceMice, Inbred BALB COligodeoxyribonucleotides/administration & dosage/geneticsT-Lymphocytes/immunologyT-Lymphocytes, Cytotoxic/immunologyTh2 Cells/immunologyVaccines, DNA/administration & dosage/genetics
Identifiers
PMID: 9973420
Full text
Structures
Research group Centre de Vaccinologie et d'Immunologie néonatale (177)
Citation
(ISO format)
KOVARIK, Jiri et al. CpG oligodeoxynucleotides can circumvent the Th2 polarization of neonatal responses to vaccines but may fail to fully redirect Th2 responses established by neonatal priming. In: Journal of Immunology, 1999, vol. 162, n° 3, p. 1611-7. https://archive-ouverte.unige.ch/unige:74348

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Deposited on : 2015-07-27

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