J-LEAPS vaccines initiate murine Th1 responses by activating dendritic cells

P. R. Taylor, G. K. Koski, C. C. Paustian, E. Bailey, Peter A Cohen, F. B G Moore, D. H. Zimmerman, K. S. Rosenthal

Research output: Contribution to journalArticle

15 Scopus citations


The Ligand Epitope Antigen Presentation System (LEAPS) converts a peptide containing a T cell epitope as small as 8 amino acids into an immunogen and directs the nature of the subsequent response. Tandem synthesis of the J peptide (a peptide from the beta-2-microglobulin) with peptides of 15 or 30 amino acids from HSV-1 or HIV made them immunogenic and promoted Th1 immune responses. Immunization of A/J or C57BL/6 mice with J-LEAPS heteroconjugates containing an epitope from the HSV-1 glycoprotein D (JgD) or an epitope from the HIV gag protein (JH) emulsified with Seppic ISA51 induced increased levels of IL-12p70 by day 3 and increased levels of interferon gamma (IFN-gamma) on days 10 and 24. Interestingly, levels of IL-10, TNF-alpha, and IL-6 did not change. Neither the H nor the gD peptides alone elicited responses and only weak responses followed immunization with the J peptide. Bone marrow (BM) cells became CD86 and CD11c positive within 48. h of treatment with JgD or JH. JH or JgD treatment promoted IL-12p70 production and expression of CD8 denoting the maturation and activation of a subclass of myeloid DCs. Pure cultures of immature myeloid DCs also responded to JgD treatment, forming clusters, developing dendrites, and producing IL-12p70 within 24. h. The JH or JgD treated bone marrow cells (JgD-DC) were necessary and sufficient to activate splenic T cells to produce IFN-gamma and the JgD-DC provided an antigen specific booster response to T cells from JgD immunized mice. Adoptive transfer of JgD-DC was also sufficient to initiate protective antigen specific immunity from lethal challenge with HSV-1. The J-LEAPS vaccines appear to act as an adjuvant and immunogen on DC precursors in a unique manner to promote activation and maturation into IL-12p70 producing DCs which then can initiate sufficient Th1 immune responses to elicit protection without production of acute phase cytokines.

Original languageEnglish (US)
Pages (from-to)5533-5542
Number of pages10
Issue number34
StatePublished - Aug 2010



  • Adoptive transfer
  • Dendritic cells
  • HIV
  • HSV
  • IL12
  • Th1
  • Vaccines

ASJC Scopus subject areas

  • Immunology and Microbiology(all)
  • Infectious Diseases
  • Public Health, Environmental and Occupational Health
  • veterinary(all)
  • Molecular Medicine
  • Medicine(all)

Cite this

Taylor, P. R., Koski, G. K., Paustian, C. C., Bailey, E., Cohen, P. A., Moore, F. B. G., Zimmerman, D. H., & Rosenthal, K. S. (2010). J-LEAPS vaccines initiate murine Th1 responses by activating dendritic cells. Vaccine, 28(34), 5533-5542. https://doi.org/10.1016/j.vaccine.2010.06.043