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In vivo depletion of CD4⁺CD25⁺ regulatory T cells enhances the antigen-specific primary and memory CTL response elicited by mature mRNA-electroporated dendritic cells

(2005) MOLECULAR THERAPY. 12(5). p.922-932
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Abstract
We previously described mRNA electroporation as an efficient gene delivery method to introduce tumor-antigens (Ag) into murine immature dendritic cells (DC). Here, we further optimize the protocol and evaluate the capacity of mRNA-electroporated DC as a vaccine for immunotherapy. First, the early DC maturation kinetics and the effect of different lipopolysaccha ride incubation periods on the phenotypic maturation profile of DC are determined. Next, we show that either immature or mature DC are equally well electroporated and express and present the transgene at a comparable level after electroporation. We point out that the mRNA electroporation results in a negative effect on the interleukin (IL)-12p70, IL-6, and tumor necrosis factor-alpha secretion after maturation. Nevertheless, mRNA-electroporated DC induce an effective cytotoxic T lymphocyte (CTL) response in vivo. Mature electroporated DC are significantly more potent in eliciting an Ag-specific CD8(+) CTL response compared to their immature electroporated counterparts. In addition, a significant improvement in CTL response is obtained both in the primary and in the memory effector phases when CD4(+)CD25(+) regulatory T cells (Treg) are depleted in vivo prior to immunization. These findings are further substantiated in tumor protection experiments and hold convincing evidence for the merit of Treg cell depletion prior to immunization with mRNA-electroporated DC.
Keywords
cytotoxic T cell response, dendritic cells, immunotherapy, regulatory T cells, OVA, IMMUNOLOGICAL SELF-TOLERANCE, AUTOIMMUNE-DISEASE, ADAPTIVE IMMUNITY, CD8-T-CELL MEMORY, CD4-T-CELL HELP, KILLER-CELL, INDUCTION, IL-2, IMMUNOTHERAPY, SUPPRESSION, maturation

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Citation

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Chicago
Van Meirvenne, Sonja, Melissa Dullaers, Carlo Heirman, Lieven Straetman, Annelies Michiels, and Kris Thielemans. 2005. “In Vivo Depletion of CD4+CD25+ Regulatory T Cells Enhances the Antigen-specific Primary and Memory CTL Response Elicited by Mature mRNA-electroporated Dendritic Cells.” Molecular Therapy 12 (5): 922–932.
APA
Van Meirvenne, S., Dullaers, M., Heirman, C., Straetman, L., Michiels, A., & Thielemans, K. (2005). In vivo depletion of CD4+CD25+ regulatory T cells enhances the antigen-specific primary and memory CTL response elicited by mature mRNA-electroporated dendritic cells. MOLECULAR THERAPY, 12(5), 922–932.
Vancouver
1.
Van Meirvenne S, Dullaers M, Heirman C, Straetman L, Michiels A, Thielemans K. In vivo depletion of CD4+CD25+ regulatory T cells enhances the antigen-specific primary and memory CTL response elicited by mature mRNA-electroporated dendritic cells. MOLECULAR THERAPY. 2005;12(5):922–32.
MLA
Van Meirvenne, Sonja, Melissa Dullaers, Carlo Heirman, et al. “In Vivo Depletion of CD4+CD25+ Regulatory T Cells Enhances the Antigen-specific Primary and Memory CTL Response Elicited by Mature mRNA-electroporated Dendritic Cells.” MOLECULAR THERAPY 12.5 (2005): 922–932. Print.
@article{1227874,
  abstract     = {We previously described mRNA electroporation as an efficient gene delivery method to introduce tumor-antigens (Ag) into murine immature dendritic cells (DC). Here, we further optimize the protocol and evaluate the capacity of mRNA-electroporated DC as a vaccine for immunotherapy. First, the early DC maturation kinetics and the effect of different lipopolysaccha ride incubation periods on the phenotypic maturation profile of DC are determined. Next, we show that either immature or mature DC are equally well electroporated and express and present the transgene at a comparable level after electroporation. We point out that the mRNA electroporation results in a negative effect on the interleukin (IL)-12p70, IL-6, and tumor necrosis factor-alpha secretion after maturation. Nevertheless, mRNA-electroporated DC induce an effective cytotoxic T lymphocyte (CTL) response in vivo. Mature electroporated DC are significantly more potent in eliciting an Ag-specific CD8(+) CTL response compared to their immature electroporated counterparts. In addition, a significant improvement in CTL response is obtained both in the primary and in the memory effector phases when CD4(+)CD25(+) regulatory T cells (Treg) are depleted in vivo prior to immunization. These findings are further substantiated in tumor protection experiments and hold convincing evidence for the merit of Treg cell depletion prior to immunization with mRNA-electroporated DC.},
  author       = {Van Meirvenne, Sonja and Dullaers, Melissa and Heirman, Carlo and Straetman, Lieven and Michiels, Annelies and Thielemans, Kris},
  issn         = {1525-0016},
  journal      = {MOLECULAR THERAPY},
  keyword      = {cytotoxic T cell response,dendritic cells,immunotherapy,regulatory T cells,OVA,IMMUNOLOGICAL SELF-TOLERANCE,AUTOIMMUNE-DISEASE,ADAPTIVE IMMUNITY,CD8-T-CELL MEMORY,CD4-T-CELL HELP,KILLER-CELL,INDUCTION,IL-2,IMMUNOTHERAPY,SUPPRESSION,maturation},
  language     = {eng},
  number       = {5},
  pages        = {922--932},
  title        = {In vivo depletion of CD4\unmatched{207a}CD25\unmatched{207a} regulatory T cells enhances the antigen-specific primary and memory CTL response elicited by mature mRNA-electroporated dendritic cells},
  url          = {http://dx.doi.org/10.1016/j.ymthe.2005.02.029},
  volume       = {12},
  year         = {2005},
}

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