Dendritic cell recovery post-lymphodepletion: a potential mechanism for anti-cancer adoptive T cell therapy and vaccination |
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Authors: | Mohamed Labib Salem David J Cole |
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Institution: | (1) Surgery Department, Medical University of South Carolina, Charleston, SC 29425, USA;(2) Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas Street, Charleston, SC 29425, USA |
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Abstract: | Adoptive transfer of autologous tumor-reactive T cells holds promise as a cancer immunotherapy. In this approach, T cells
are harvested from a tumor-bearing host, expanded in vitro and infused back to the same host. Conditioning of the recipient
host with a lymphodepletion regimen of chemotherapy or radiotherapy before adoptive T cell transfer has been shown to substantially
improve survival and anti-tumor responses of the transferred cells. These effects are further enhanced when the adoptive T
cell transfer is followed by vaccination with tumor antigens in combination with a potent immune adjuvant. Although significant
progress has been made toward an understanding of the reasons underlying the beneficial effects of lymphodepletion to T cell
adoptive therapy, the precise mechanisms remain poorly understood. Recent studies, including ours, would indicate a more central
role for antigen presenting cells, in particular dendritic cells. Unraveling the exact role of these important cells in mediation
of the beneficial effects of lymphodepletion could provide novel pathways toward the rational design of more effective anti-cancer
immunotherapy. This article focuses on how the frequency, phenotype, and functions of dendritic cells are altered during the
lymphopenic and recovery phases post-induction of lymphodepletion, and how they affect the anti-tumor responses of adoptively
transferred T cells. |
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