Key Points
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Vaccines against cancer aim to induce both tumour-specific effector T cells that can reduce the tumour mass and tumour-specific memory T cells that can control tumour relapse.
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Dendritic cells (DCs) induce and regulate immune responses; therefore, they are a crucial target and tool for vaccination. The immunogenicity of antigens delivered by DCs has now been shown in patients with cancer.
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Basic principles of DC biology in the context of vaccination are discussed. By examining these principles, it is evident that certain parameters of vaccination with DCs need to be refined to improve efficacy. These include strategies for loading DCs with tumour antigens; manipulation of the different DC-maturation signals that can lead to different types of induced immune response; and promotion of the migration of DCs from the site of injection to draining lymph nodes.
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The importance of different DC subsets leading to the induction of distinct immune responses is reviewed. This complexity of the DC system requires that each DC subset be tested for efficacy at inducing antitumour responses in vivo. The ultimate ex vivo-generated DC vaccine will be heterogeneous and composed of several subsets, each of which will target a specific immune effector.
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The challenges of effective vaccination against chronic diseases, including cancer, are highlighted, particularly the exhaustion of antigen-specific T cells (owing to chronic activation) and the existence of other immune mechanisms that might hinder vaccine efficacy (for example, the development of tumour-antigen-specific regulatory T cells).
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Immune correlates of efficacy of DC vaccines are defined, including breadth of induced tumour-specific immunity, induction of tumour-specific effector and memory T cells, induction of T cells that kill tumour cells, and decreased numbers of T cells with regulatory function.
Abstract
Mouse studies have shown that the immune system can reject tumours, and the identification of tumour antigens that can be recognized by human T cells has facilitated the development of immunotherapy protocols. Vaccines against cancer aim to induce tumour-specific effector T cells that can reduce the tumour mass, as well as tumour-specific memory T cells that can control tumour relapse. Owing to their capacity to regulate T-cell immunity, dendritic cells are increasingly used as adjuvants for vaccination, and the immunogenicity of antigens delivered by dendritic cells has now been shown in patients with cancer. A better understanding of how dendritic cells regulate immune responses will allow us to better exploit these cells to induce effective antitumour immunity.
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Acknowledgements
We thank our patients for volunteering to participate in our studies. We thank our colleagues and collaborators, including J. Connolly, M. Dhodapkar, J. Fay, S. Paczesny, R. Steinman and H. Ueno, for their contributions to our progress. We are grateful to all former and current members of the Baylor Institute for Immunology Research (Dallas, United States). We thank M. Ramsay and W. Duncan for support. We thank M. Dhodapkar, R. Steinman and J. Weber for comments on the manuscript. We dedicate this review to P. Pascual. This research was supported by grants from the Baylor Health Care System Foundation and the National Institutes of Health (United States). J.B. is the recipient of the W. W. Caruth Jr Chair in Organ Transplantation Immunology. A.K.P. is the recipient of the Michael A. E. Ramsay Chair for Cancer Immunology Research.
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Competing interests
Jacques Banchereau has been a consultant for Argos Therapeutics and is a scientific founder of ODC Therapy, Inc., which are both private companies. He has stock options in both. A. Karolina Palucka is a scientific founder of ODC Therapy, Inc., and she also has stock options. These private companies undertake research associated with dendritic-cell vaccines. Neither one of them has in any way supported the clinical trials, the results of which are described in this paper.
Glossary
- IMMUNOSENESCENCE
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The decreased function of the immune system with age. In particular, the number of naive T cells decreases as thymic function decreases.
- CENTRAL TOLERANCE
-
The lack of self-responsiveness that occurs as lymphocytes develop. It is associated with the deletion of autoreactive clones. For T cells, this occurs in the thymus.
- PERIPHERAL TOLERANCE
-
The lack of self-responsiveness of mature lymphocytes to specific antigens. It is associated with suppression of production of self-reactive antibodies by B cells and inhibition of self-reactive effector cells, such as cytotoxic T lymphocytes and natural killer cells.
- ANERGY
-
A state of T cells that have been stimulated through their T-cell receptor in the absence of ligation of the co-stimulatory molecule CD28. On restimulation, these T cells cannot produce interleukin-2 or proliferate, even in the presence of co-stimulatory signals.
- INDUCIBLE REGULATORY T CELLS
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A subset of CD4+ T cells that mediate their effects through the secretion of cytokines such as interleukin-10 and transforming growth factor-β, which inhibit other T cells. Their role is to maintain self-tolerance.
- CD4+CD25+ REGULATORY T CELLS
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(TReg cells). A subset of CD4+ T cells that express high levels of CD25 (also known as the interleukin-2 receptor α-chain), are naturally anergic and require stimulation through the T-cell receptor for induction of their cell-mediated suppressive function. Their role is to maintain self-tolerance.
- ELISPOT
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(Enzyme-linked immunosorbent spot). An antibody-capture-based method for enumerating specific T cells (CD4+ and CD8+) that secrete a particular cytokine (often interferon-γ).
- TUMOUR-ASSOCIATED ANTIGENS
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Antigens that are expressed by tumour cells. These belong to three main categories: tissue-differentiation antigens, which are also expressed by non-malignant cells; mutated or aberrantly expressed molecules; and cancer testis antigens, which are normally expressed only by spermatocytes and occasionally in the placenta.
- MODIFIED HETEROCLITIC PEPTIDES
-
Short amino-acid sequences in which certain amino acids are replaced to ensure increased binding to MHC class I molecules.
- EXOSOMES
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Small lipid-bilayer vesicles that are released from dendritic cells and other cells. They are composed of cell membranes or are derived from the membranes of intracellular vesicles. They might contain antigen–MHC complexes and interact with antigen-specific lymphocytes directly, or they might be taken up by other antigen-presenting cells.
- CROSS-PRIMING
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The initiation of a CD8+ T-cell response to an antigen that is not present within antigen-presenting cells: in this case, dendritic cells. This occurs through the ability of dendritic cells to present peptides that are derived from exogenous antigens in the context of MHC class I molecules. This property is atypical, as most cells exclusively present peptides derived from endogenous proteins in the context of MHC class I molecules.
- IMMUNOEDITING
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The generation of tumour variants with reduced immunogenicity, which might therefore escape from immune responses.
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Banchereau, J., Palucka, A. Dendritic cells as therapeutic vaccines against cancer. Nat Rev Immunol 5, 296–306 (2005). https://doi.org/10.1038/nri1592
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DOI: https://doi.org/10.1038/nri1592
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