Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-20896-z
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Funding
- National Health and Medical Research Council
- Cancer Institute NSW
- DIPG Collaborative
- Cure Starts Now
- Tour de Cure Foundation
- Cure Brain Cancer Foundation
- Levi's project
- Benny Wills Brain Tumor Research fund
- Isabella and Marcus Foundation's funding
- Gemma Howell Scholarship
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DIPG is a deadly childhood brain tumor with limited treatment options. Targeting both polyamine synthesis and uptake can lead to prolonged survival in animal models of this incurable disease.
Diffuse intrinsic pontine glioma (DIPG) is an incurable malignant childhood brain tumor, with no active systemic therapies and a 5-year survival of less than 1%. Polyamines are small organic polycations that are essential for DNA replication, translation and cell proliferation. Ornithine decarboxylase 1 (ODC1), the rate-limiting enzyme in polyamine synthesis, is irreversibly inhibited by difluoromethylornithine (DFMO). Herein we show that polyamine synthesis is upregulated in DIPG, leading to sensitivity to DFMO. DIPG cells compensate for ODC1 inhibition by upregulation of the polyamine transporter SLC3A2. Treatment with the polyamine transporter inhibitor AMXT 1501 reduces uptake of polyamines in DIPG cells, and co-administration of AMXT 1501 and DFMO leads to potent in vitro activity, and significant extension of survival in three aggressive DIPG orthotopic animal models. Collectively, these results demonstrate the potential of dual targeting of polyamine synthesis and uptake as a therapeutic strategy for incurable DIPG. Diffuse intrinsic pontine glioma (DIPG) is an almost incurable malignant childhood brain tumor. Here, the authors show that the polyamine synthetic pathway is activated in DIPG and that the dual targeting of polyamine synthesis and uptake results in prolonged survival in animal models.
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