4.3 Article

A novel polyamine blockade therapy activates an anti-tumor immune response

期刊

ONCOTARGET
卷 8, 期 48, 页码 84140-84152

出版社

IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.20493

关键词

polyamines; difluoromethylornithine; transport inhibitor; immunomodulation; tumor microenvironment

资金

  1. National Cancer Institute [R01 CA70739]
  2. John B. Deaver Foundation
  3. DOD [CA150356]

向作者/读者索取更多资源

Most tumors maintain elevated levels of polyamines to support their growth and survival. This study explores the anti-tumor effect of polyamine starvation via both inhibiting polyamine biosynthesis and blocking the upregulated import of polyamines into the tumor. We demonstrate that polyamine blockade therapy (PBT) co-treatment with both DFMO and a novel polyamine transport inhibitor, Trimer PTI, significantly inhibits tumor growth more than treatment with DFMO or the Trimer PTI alone. The anti-tumor effect of PBT was lost in mice where CD4(+) and CD8(+) T cells were antibody depleted, implying that PBT stimulates an anti-tumor immune effect that is T-cell dependent. The PBT anti-tumor effect was accompanied by an increase in granzyme B+, IFN-gamma(+) CD8(+) T-cells and a decrease in immunosuppressive tumor infiltrating cells including Gr-1(+) CD11b(+) myeloid derived suppressor cells (MDSCs), CD4(+) CD25(+) Tregs, and CD206(+) F4/80(+) M2 macrophages. Stimulation with tumor-specific peptides elicited elevated antigen-specific IFN-gamma secretion in splenocytes from PBT-treated mice, indicating that PBT treatment stimulates the activation of T-cells in a tumor-specific manner. These data show that combined treatment with both DFMO and the Trimer PTI not only deprives polyamine-addicted tumor cells of polyamines, but also relieves polyamine-mediated immunosuppression in the tumor microenvironment, thus allowing the activation of tumoricidal T-cells.

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