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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1990 Jul;87(14):5519–5522. doi: 10.1073/pnas.87.14.5519

Enhanced immunogenicity of a sequence derived from hepatitis B virus surface antigen in a composite peptide that includes the immunostimulatory region from human interleukin 1.

K V Rao 1, A R Nayak 1
PMCID: PMC54356  PMID: 2371286

Abstract

The effect on immunogenicity of coupling the immunostimulatory nonapeptide sequence (residues 163-171) from human interleukin 1 beta (IL-1 beta) to a small immunogen was examined. A 21-amino acid sequence spanning positions 12-32 on the large protein of hepatitis B surface antigen was chosen as a model. Three peptides were synthesized corresponding to the IL-1 beta-derived sequence [peptide IL-(163-171)], the hepatitis B surface antigen-derived sequence [peptide S1-(12-32)] and a composite peptide that included both these sequences separated by a spacer of two glycine residues [peptide S1-(12-32)-IL-(163-171)]. In an in vitro thymocyte proliferation assay, both peptides S1-(12-32)-IL-(163-171) and IL-(163-171) showed comparable activity, whereas peptide S1-(12-32) was inactive. Groups of five to seven mice each from C3H/CH, BALB/c, SJL/J, and C57BL/6 strains were immunized with equimolar amounts of either peptide S1-(12-32), peptide S1-(12-32)-IL-(163-171), or a mixture of peptides S1-(12-32) and IL-(163-171), and sera were screened for anti-S1-(12-32) antibodies. In all strains, peptide S1-(12-32)-IL-(163-171) elicited an increased primary and secondary anti-S1-(12-32) antibody response compared to the other two groups. Further, peptide S1-(12-32)-IL-(163-171) also induced an increased number of responders to primary immunization, though the number of responders was quantitative in all groups following secondary immunization. At least part of the enhanced immunogenicity of the S1-(12-32) sequence in peptide S1-(12-32)-IL-(163-171) appears to be due to augmented T-helper cell activity. These results suggest that coupling of the immunostimulatory IL-1 beta-derived sequence in tandem with an immunogen may confer inbuilt adjuvanticity.

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Selected References

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