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The Warburg Trap: A Novel Therapeutic Approach for Targeting Osteosarcoma
Joerg Fellenberg1, Sarina Losch1, Elena Tripel1
1Department of Orthopaedics, University Hospital Heidelberg, 69118 Heidelberg, Germany.
Abstract:
Although urgently needed, no significant improvements in osteosarcoma (OS) therapy have been achieved within the last decades. Here, we present a new therapeutic approach based on drug combinations consisting of mitochondrial complex I (MCI) inhibitors and ionophores that induce cancer cell-specific cell death based on a modulation of cellular energy metabolism and intracellular pH (pHi) named the Warburg Trap (WT). The effects of several drug combinations on intracellular pH, cell viability, colony-forming capacity and expression of WNT-target genes were analysed using OS cell lines and primary human osteoblasts (HOB). Tumour take rates and tumour volumes were analysed in vivo using a chicken chorioallantoic membrane assay (CAM). Several WT drug combinations induced the intracellular acidification and apoptotic cell death in OS cells, whereas HOBs tolerated the treatment. A significant inhibition of the colony-forming ability of OS cells and downregulation of WNT-target genes suggest that cancer stem cells (CSCs) are also targeted by the WT approach. In vivo, we observed a significant reduction in the tumour take rates in response to WT drug treatment. Our data suggest that the Warburg Trap is a promising approach for the development of a novel and effective OS therapy to replace or supplement the current OS chemotherapy.
Insights
A novel Warburg Trap (WT) therapy combining mitochondrial complex I inhibitors and ionophores shows promise for osteosarcoma treatment. This approach selectively targets cancer cells, reducing tumor growth and potentially impacting cancer stem cells.
Area of Science:
- Oncology
- Biochemistry
- Cell Biology
Background:
- Osteosarcoma (OS) therapy has seen limited progress in recent decades.
- There is a critical need for novel therapeutic strategies to improve patient outcomes.
Purpose of the Study:
- To investigate a new therapeutic approach, the Warburg Trap (WT), for osteosarcoma.
- To evaluate drug combinations targeting cellular energy metabolism and intracellular pH (pHi) for cancer-specific cell death.
Main Methods:
- Drug combinations (MCI inhibitors and ionophores) were tested on OS cell lines and primary human osteoblasts (HOBs).
- Analyses included intracellular pH, cell viability, colony formation, WNT-target gene expression, and in vivo tumor growth using a chicken chorioallantoic membrane (CAM) assay.
Main Results:
- WT drug combinations induced intracellular acidification and apoptotic cell death in OS cells, sparing HOBs.
- Significant inhibition of OS cell colony formation and downregulation of WNT-target genes were observed, suggesting CSC targeting.
- In vivo studies showed a significant reduction in tumor take rates with WT treatment.
Conclusions:
- The Warburg Trap (WT) represents a promising therapeutic strategy for osteosarcoma.
- WT drug combinations demonstrate cancer cell-specific toxicity and potential efficacy against cancer stem cells.
- This approach could offer a novel alternative or supplement to current osteosarcoma chemotherapy.
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