Synergy between in situ cryoablation and TLR9 stimulation results in a highly effective in vivo dendritic cell vaccine.

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Publication year
2006Source
Cancer Research, 66, 14, (2006), pp. 7285-92ISSN
Publication type
Article / Letter to editor

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Organization
Tumorimmunology
Surgery
Journal title
Cancer Research
Volume
vol. 66
Issue
iss. 14
Page start
p. 7285
Page end
p. 92
Subject
N4i 1: Pathogenesis and modulation of inflammation; NCMLS 1: Immunity, infection and tissue repair; NCMLS 2: Immune Regulation; ONCOL 3: Translational research; UMCN 1.4: Immunotherapy, gene therapy and transplantation; UMCN 4.1: Microbial pathogenesis and host defenseAbstract
Dendritic cells (DC) are professional antigen-presenting cells that play a pivotal role in the induction of immunity. Ex vivo-generated, tumor antigen-loaded mature DC are currently exploited as cancer vaccines in clinical studies. However, antigen loading and maturation of DC directly in vivo would greatly facilitate the application of DC-based vaccines. We have previously shown that in situ tumor destruction by ablative treatments efficiently delivers antigens for the in vivo induction of antitumor immunity. In this article, we show that although 20% of the draining lymph node DCs acquire intratumorally injected model antigens after in situ cryoablation, only partial protection against a subsequent tumor rechallenge is observed. However, we also show that a combination treatment of cryoablation plus TLR9 stimulation via CpG-oligodeoxynucleotides is far more effective in the eradication of local and systemic tumors than either treatment modality alone. Analysis of the underlying mechanism revealed that in situ tumor ablation synergizes with TLR9 stimulation to induce DC maturation and efficient cross-presentation in tumor-bearing mice, leading to superior DC function in vivo. Therefore, in situ tumor destruction in combination with CpG-oligodeoxynucleotide administration creates a unique "in situ DC vaccine" that is readily applicable in the clinic.
This item appears in the following Collection(s)
- Academic publications [227727]
- Electronic publications [107315]
- Faculty of Medical Sciences [86204]
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