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- W2036372783 abstract "An emerging paradigm in vaccinology is that multiple adjuvant combinations may be more effective than individual adjuvants in enhancing immune responses to vaccine antigens. We investigated whether the polyphosphazenes used in combination with CpG oligodeoxynucleotides (ODN) were potent adjuvant formulations. BALB/c mice were immunized subcutaneously with Hepatitis B surface antigen (HBsAg) alone, or in various combinations with poly[di(sodium carboxylatophenoxy)phosphazene] (PCPP), poly[di(sodium carboxylatoethylphenoxy)phosphazene] (PCEP) or CpG ODN. All three adjuvants enhanced HBsAg-specific IgG1 antibody responses with PCEP inducing the highest responses. PCEP and CpG ODN significantly enhanced the Th1-associated antibody isotype IgG2a. As expected CpG ODN induced predominantly Th1-type immune responses while PCEP was associated with mixed Th1/Th2 immune responses. Interestingly, PCEP and PCPP synergized with CpG ODN to further enhance antibody responses. Since the mechanisms which mediate the adjuvant activity of polyphosphazenes are not fully understood, we investigated whether PCEP and PCPP could stimulate innate immune responses. Incubation of mouse splenocytes with PCEP or PCPP (in the absence of antigen) stimulated production of IL-4 and IL-12, but only PCEP induced significant IFNγ production. Additionally, IL-12 was not required for PCEP induced IFNγ response. We conclude that the polyphosphazene–CpG ODN combination is a potent adjuvant formulation that is more effective in enhancing immune responses than either of the individual adjuvants. In addition, we provide evidence that PCEP and PCPP can stimulate innate cytokine production, suggesting a potential mechanism by which polyphosphazenes achieve their potent adjuvant effects." @default.
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- W2036372783 date "2008-05-01" @default.
- W2036372783 modified "2023-10-16" @default.
- W2036372783 title "Co-administration of polyphosphazenes with CpG oligodeoxynucleotides strongly enhances immune responses in mice immunized with Hepatitis B virus surface antigen" @default.
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- W2036372783 doi "https://doi.org/10.1016/j.vaccine.2008.03.031" @default.
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