CD40 activation in vivo overcomes peptide-induced peripheral cytotoxic T-lymphocyte tolerance and augments anti-tumor vaccine efficacy


The outcome of antigen recognition by naive CD8+ cytotoxic T lymphocytes (CTLs) in the periphery is orchestrated by CD4+ T-helper cells, and can either lead to priming or tolerization. The presence of T-helper cells favors the induction of CTL immunity, whereas the absence of T-helper cells can result in CTL tolerance. The action of T helper cells in CTL priming is mediated by CD40–CD40 ligand interactions. We demonstrate here that triggering of CD40 in vivo can considerably enhance the efficacy of peptide-based anti-tumor vaccines. The combination of a tolerogenic peptide vaccine containing a minimal essential CTL epitope with an activating antibody against CD40 converts tolerization into strong CTL priming. Moreover, CD40 ligation can provide an already protective tumor-specific peptide vaccine with the capacity to induce therapeutic CTL immunity in tumor-bearing mice. These findings indicate that the CD40–CD40 ligand pair can act as a 'switch', determining whether naive peripheral CTLs are primed or tolerized, and support the clinical use of CD40-stimulating agents as components of anti-cancer vaccines.

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Figure 1: Mice injected with the E1A peptide are no longer able to mount E1A-specific CTLs.
Figure 2: Tolerizing E1A peptide is rapidly distributed systemically after subcutaneous injection in IFA.
Figure 3: CTL tolerance induction is reverted to priming of CTLs after triggering of CD40 in vivo.
Figure 4: E1A-specific CD8+ cells can only be detected in the spleen after E1A peptide administration in combination with triggering of CD40.
Figure 5: B cells are not required for the induction of CTL tolerance after peptide administration.
Figure 6: B cells are not required for the restoration of CTL responses through CD40 activation.
Figure 7: Treatment of HPV16 E6- and E7-transformed cells by a combination of peptide together with in vivo CD40 triggering.


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We thank F. Claas for critically reading our manuscript and A.H. Zwinderman for statistical analysis. The research of R.E.M.T. was made possible by a fellowship of the Royal Academy of Arts and Sciences. This work was supported by the Dutch Cancer Foundation (grants RUL 97-1449 and RUL-97-1450). S.P.S is supported by a grant from the American Cancer Society.

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Correspondence to Linda Diehl or Rene E. M. Toes.

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