Anti-Gr-1 antibody provides short-term depletion of MDSC in lymphodepleted mice with active-specific melanoma therapy

Lymphodepletion, reconstitution and active-specific tumor cell vaccination (LRAST) enhances the induction of tumor-specific T cells in a murine melanoma model. Myeloid-derived suppressor cells (MDSC) may counteract the induction of tumor-reactive T cells and their therapeutic efficacy. Thus, the aim...

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Hauptverfasser: Rose, Peter (VerfasserIn) , van den Engel, Natasja K. (VerfasserIn) , Kovács, Julia R. (VerfasserIn) , Hatz, Rudolf A. (VerfasserIn) , Boon, Louis (VerfasserIn) , Winter, Hauke (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 4 April 2022
In: Vaccines
Year: 2022, Jahrgang: 10, Heft: 4, Pages: 1-19
ISSN:2076-393X
DOI:10.3390/vaccines10040560
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/vaccines10040560
Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2076-393X/10/4/560
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Verfasserangaben:Peter Rose, Natasja K. van den Engel, Julia R. Kovács, Rudolf A. Hatz, Louis Boon and Hauke Winter

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520 |a Lymphodepletion, reconstitution and active-specific tumor cell vaccination (LRAST) enhances the induction of tumor-specific T cells in a murine melanoma model. Myeloid-derived suppressor cells (MDSC) may counteract the induction of tumor-reactive T cells and their therapeutic efficacy. Thus, the aim of the study was to evaluate a possible benefit of MDSC depletion using anti-Gr-1 antibodies (Ab) in combination with LRAST. Female C57BL/6 mice with 3 days established subcutaneous (s.c.) D5 melanoma were lymphodepleted with cyclophosphamide and reconstituted with naive splenocytes. Vaccination was performed with irradiated syngeneic mGM-CSF-secreting D5G6 melanoma cells. MDSC depletion was performed using anti-Gr-1 Ab (clone RB6-8C5). Induction of tumor-specific T cells derived from tumor vaccine draining lymph nodes (TVDLN) was evaluated by the amount of tumor-specific interferon (IFN)-γ release. LRAST combined with anti-Gr-1 mAb administration enhanced the induction of tumor-specific T cells in TVDLN capable of releasing IFN-γ in a tumor-specific manner. Additional anti-Gr-1 mAb administration in LRAST-treated mice delayed growth of D5 melanomas by two weeks. Furthermore, we elucidate the impact of anti-Gr-1-depleting antibodies on the memory T cell compartment. Our data indicate that standard of care treatment regimens against cancer can be improved by implementing agents, e.g., depleting antibodies, which target and eliminate MDSC. 
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