CpG ODN 2006 and IL-12 are comparable for priming Th1 lymphocyte and IgG responses in cattle immunized with a rickettsial outer membrane protein in alum

Vaccine. 2003 Jul 4;21(23):3307-18. doi: 10.1016/s0264-410x(03)00176-2.

Abstract

Immunostimulatory oligodeoxynucleotides containing unmethylated CpG dinucleotides (CpG ODN) stimulate IL-12-dependent Th1 dominated cytokine and enhanced IgG responses when co-delivered with antigen to mice. However, the CpG ODN sequences that are optimal for each mammalian species may differ. Previously, we demonstrated that a CpG ODN containing the GTCGTT motif was optimal for stimulating bovine B cell proliferation, and induced IL-6, IL-12 and IFN-gamma production by peripheral blood mononuclear cells (PBMC). The current study was designed to test the hypothesis that the nuclease resistant phosphorothioate modified ODN 2006 (TCGTCGTTTTGTCGTTTTGTCGTT) would induce antigen-specific type 1 cytokine and enhanced IgG responses similar to those induced by IL-12. To test this adjuvant effect, calves were immunized with Anaplasma marginale major surface protein 2 (MSP2) with alum alone or combined with CpG ODN 2006, non-CpG ODN R2006 or IL-12. MSP2-specific IgG1 and IgG2 responses developed more rapidly in calves given IL-12, ODN 2006 or ODN R2006, but the highest IgG1 titers were obtained in CpG ODN-immunized calves. Antigen-specific lymphocyte proliferation and frequency of IFN-gamma-secreting cells were significantly increased in CpG ODN 2006- or IL-12-treated calves, and antigen-stimulated PBMC from these calves also expressed higher levels of IFN-gamma transcripts and lower levels of IL-4 transcripts. No differences in IL-10 mRNA expression were detected among the groups. These results indicate that CpG ODN 2006 is an effective vaccine adjuvant for stimulating both antibody and IFN-gamma mediated cellular immune responses in cattle.

Publication types

  • Comparative Study
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adjuvants, Immunologic / pharmacology*
  • Alum Compounds / chemistry
  • Anaplasma / immunology*
  • Animals
  • B-Lymphocytes / drug effects
  • Bacterial Outer Membrane Proteins / immunology*
  • Cattle
  • Cell Division / drug effects
  • Cytokines / biosynthesis
  • Immunization
  • Immunoglobulin G / biosynthesis*
  • Interferon-gamma / biosynthesis
  • Interleukin-12 / pharmacology*
  • Male
  • Oligonucleotides / pharmacology*
  • RNA, Messenger / biosynthesis
  • Th1 Cells / drug effects
  • Th1 Cells / immunology*

Substances

  • Adjuvants, Immunologic
  • Alum Compounds
  • Bacterial Outer Membrane Proteins
  • Cytokines
  • Immunoglobulin G
  • Oligonucleotides
  • RNA, Messenger
  • p44 protein, Anaplasma phagocytophila
  • Interleukin-12
  • aluminum sulfate
  • Interferon-gamma