Dendritic cell-based cancer vaccine

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Dendritic cells (DCs) are powerful antigen presenting cells for the induction of antigen specific T cell response.[1] DC vaccine has been introduced as a new therapeutic strategy in cancer patients. DC-based immunotherapy is safe and can promote antitumor immune responses and prolonged survival of cancer patients.[2]

Human DC subsets[edit]

Immature dendritic cells[edit]

Non-activated (immature) DCs are usually located in the peripheral non-lymphoid tissues and they can present self-antigens to T cells, that leads to immune tolerance either through T cell deletion or through the differentiation of regulatory T cells or suppressor T cells.[3]

Mature dendritic cells[edit]

Mature DCs have ability to present antigens in the lymphoid tissues and prime, activate and expand effector immune cells with unique functions and cytokine profiles.[4]

Myeloid dendritic cells (cDCs)[edit]

Myeloid or conventional DCs (cDCs) are derived from myeloid progenitor cells in the bone marrow and are characterized by expression of CD11c.[5] cDCs can be subdivided into 3 groups: monocyte-derived DCs, CD1a- interstitial DCs, and CD1a+ Langerhans cells.[6]

Plasmacytoid dendritic cells (pDCs)[edit]

Plasmacytoid dendritic cells (pDCs) differentiate from lymphoid progenitor cells in the lymphoid tissues.[7] They express CD123 and product high levels of type I interferon.[8] pDCs also contribute to inflammatory responses in the steady state and in pathology. During inflammatory response, inflammatory DCs (iDCs) are generated from monocytes.[9]

Function of cancer therapeutic vaccines[edit]

The main goal of the therapeutic vaccines is to elicit cellular immunity.[10] They should prime naive T cells as well as induce transition from chronically activated non-protective CD8+ T cells to healthy CD8+ T cells able to produce cytotoxic T lymphocytes (CTLs), that recognise and eliminate cancer cells in an antigen-specific way and also provide long-lived memory CD8+ T cells that will act to prevent relapse.[11] The most critical step in vaccination is the effective presentation of cancer antigens to T cells and because of DCs are the most efficient antigen presenting cells, they are the promising option for improvement of therapeutic vaccines.[12]

Methods for exploiting dendritic cells in cancer therapeutic vaccines[edit]

DC-based immunotherapy approach can be employed in a couple of ways:

Direct targeting/stimulating of the DCs in vivo to accentuate their anticancer phenotype[edit]

Most of trials testing in vivo DCs’ stimulation with synthetic peptides failed because of inability of effective stimulation of CD4+ cellular responses and stimulation of Th2 type cytokines.[13] The solution showing clinical responses was pre-treatment with single-dose cyclophosphamide as well as vaccination with tumor associated antigens (TAAs) and granulocyte macrophage colony stimulating factor (GM-CSF).[14]

Stimulation of the DCs ex vivo and infusing them back into the host for carrying out anticancer effector function[edit]

In this way, DCs’ precursors are isolated from the patient through leukapheresis and after maturation/stimulation of these precursors ex vivo, fully mature DCs are injected back into the patient.[15] There are different ways applied to generate cancer cells-specific DCs. We can used specific TAAs, tumor lysates, created DC-cancer cell fusions, electroporation/transfection of DCs with total cancer cell-mRNA or tumor derived exosomes (TDEs) by the stimulation. There is also the possibility of additional co-stimulating with cytokine “cocktails” to assure strong maturation.[14]

Dendritic cell vaccine against brain tumor[edit]

The most well-known source of antigens used for vaccines in Glioblastoma (Aggressive type of brain tumor) investigations were whole tumor lysate, CMV antigen RNA and tumor associated peptides for instance EGFRvIII. The initial studies showed that patients developed immune responses as measured by Interferon-gamma expression in the peripheral blood, systemic cytokine responses, or CD8+ antigen specific T cell expansion. Clinical response rates were not as vigorous as the immune response rates. Overall survival (OS) and progression free survival (PFS) varied in different studies but were enhanced compared to historical controls.[16]

Sipuleucel-T[edit]

Sipuleucel-T is the first DCs- based cancer vaccine for men with asymptomatic or minimally symptomatic metastatic castration-resistant prostate cancer (CRPC), approved by the US Food and Drug Administration (FDA) .[17][18] It is an active cellular immunotherapy, which involves obtaining antigen-presenting autologous dendritic cells from the patient following a leukapheresis procedure.[19] The cells are incubated ex vivo in the presence of a recombinant fusion protein PA2024 containing a prostate antigen, prostate acid phosphatase and GM-CSF, an immune-cell activator. The cells are then returned to the patient to generate an immune response.[20][21]

References[edit]

  1. ^ Stockwin, Luke H.; McGonagle, Dennis; Martin, Iain G.; Blair, G. Eric (April 2000). "Dendritic cells: Immunological sentinels with a central role in health and disease". Immunology and Cell Biology. 78 (2): 91–102. doi:10.1046/j.1440-1711.2000.00888.x. ISSN 0818-9641. PMID 10762408.
  2. ^ Datta, Jashodeep; Terhune, Julia H.; Lowenfeld, Lea; Cintolo, Jessica A.; Xu, Shuwen; Roses, Robert E.; Czerniecki, Brian J. (2014-12-12). "Optimizing Dendritic Cell-Based Approaches for Cancer Immunotherapy". The Yale Journal of Biology and Medicine. 87 (4): 491–518. ISSN 0044-0086. PMC 4257036. PMID 25506283.
  3. ^ Mellman, Ira (2013-09-01). "Dendritic Cells: Master Regulators of the Immune Response". Cancer Immunology Research. 1 (3): 145–149. doi:10.1158/2326-6066.CIR-13-0102. ISSN 2326-6066. PMID 24777676.
  4. ^ Dalod, Marc; Chelbi, Rabie; Malissen, Bernard; Lawrence, Toby (2014-05-16). "Dendritic cell maturation: functional specialization through signaling specificity and transcriptional programming". The EMBO Journal. 33 (10): 1104–1116. doi:10.1002/embj.201488027. ISSN 0261-4189. PMC 4193918. PMID 24737868.
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  10. ^ Guo, Chunqing; Manjili, Masoud H.; Subjeck, John R.; Sarkar, Devanand; Fisher, Paul B.; Wang, Xiang-Yang (2013). Therapeutic Cancer Vaccines: Past, Present and Future. Advances in Cancer Research. 119. pp. 421–475. doi:10.1016/B978-0-12-407190-2.00007-1. ISBN 9780124071902. ISSN 0065-230X. PMC 3721379. PMID 23870514.
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  12. ^ Anguille, Sébastien; Smits, Evelien L; Lion, Eva; van Tendeloo, Viggo F; Berneman, Zwi N (2014-06-01). "Clinical use of dendritic cells for cancer therapy". The Lancet Oncology. 15 (7): e257–e267. doi:10.1016/S1470-2045(13)70585-0. PMID 24872109.
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  14. ^ a b Dudek, Aleksandra M.; Martin, Shaun; Garg, Abhishek D.; Agostinis, Patrizia (2013-12-11). "Immature, Semi-Mature, and Fully Mature Dendritic Cells: Toward a DC-Cancer Cells Interface That Augments Anticancer Immunity". Frontiers in Immunology. 4: 438. doi:10.3389/fimmu.2013.00438. ISSN 1664-3224. PMC 3858649. PMID 24376443.
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  18. ^ Anassi, Enock; Ndefo, Uche Anadu (April 2011). "Sipuleucel-T (Provenge) Injection". Pharmacy and Therapeutics. 36 (4): 197–202. ISSN 1052-1372. PMC 3086121. PMID 21572775.
  19. ^ Graff, Julie N; Chamberlain, Erin D (2014-12-18). "Sipuleucel-T in the treatment of prostate cancer: an evidence-based review of its place in therapy". Core Evidence. 10: 1–10. doi:10.2147/CE.S54712. ISSN 1555-1741. PMC 4279604. PMID 25565923.
  20. ^ Rini, Brian I.; Weinberg, Vivian; Fong, Lawrence; Conry, Shauna; Hershberg, Robert M.; Small, Eric J. (2006-07-01). "Combination immunotherapy with prostatic acid phosphatase pulsed antigen-presenting cells (provenge) plus bevacizumab in patients with serologic progression of prostate cancer after definitive local therapy". Cancer. 107 (1): 67–74. doi:10.1002/cncr.21956. ISSN 0008-543X. PMID 16736512.
  21. ^ Eager, Robert; Nemunaitis, John (2005-07-01). "GM-CSF Gene-Transduced Tumor Vaccines". Molecular Therapy. 12 (1): 18–27. doi:10.1016/j.ymthe.2005.02.012. PMID 15963916.