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Published on: December 26, 2016
Targeting the metabolic microenvironment of tumors
Kate M Bailey1, Jonathan W Wojtkowiak, Arig Ibrahim Hashim
1Department of Imaging and Metabolism, H. Lee Moffitt Cancer Center, Tampa, FL, USA.
Abstract:
The observation of aerobic glycolysis by tumor cells in 1924 by Otto Warburg, and subsequent innovation of imaging glucose uptake by tumors in patients with PET-CT, has incited a renewed interest in the altered metabolism of tumors. As tumors grow in situ, a fraction of it is further away from their blood supply, leading to decreased oxygen concentrations (hypoxia), which induces the hypoxia response pathways of HIF1α, mTOR, and UPR. In normal tissues, these responses mitigate hypoxic stress and induce neoangiogenesis. In tumors, these pathways are dysregulated and lead to decreased perfusion and exacerbation of hypoxia as a result of immature and chaotic blood vessels. Hypoxia selects for a glycolytic phenotype and resultant acidification of the tumor microenvironment, facilitated by upregulation of proton transporters. Acidification selects for enhanced metastatic potential and reduced drug efficacy through ion trapping. In this review, we provide a comprehensive summary of preclinical and clinical drugs under development for targeting aerobic glycolysis, acidosis, hypoxia and hypoxia response pathways. Hypoxia and acidosis can be manipulated, providing further therapeutic benefit for cancers that feature these common phenotypes.
Insights
Tumor cells exhibit aerobic glycolysis, a phenomenon exacerbated by hypoxia. Targeting these metabolic alterations and their associated pathways shows promise for enhancing cancer therapy and reducing metastasis.
Area of Science:
- Oncology
- Cancer Metabolism
- Tumor Microenvironment
Background:
- Otto Warburg's 1924 observation of aerobic glycolysis in tumors and PET-CT imaging highlighted altered tumor metabolism.
- Tumor growth leads to hypoxia, activating pathways like HIF1α, mTOR, and UPR, which are dysregulated in cancer.
- Tumor hypoxia and acidosis promote metastasis and reduce drug efficacy via mechanisms like ion trapping.
Purpose of the Study:
- To review preclinical and clinical drugs targeting aerobic glycolysis, acidosis, and hypoxia response pathways in cancer.
- To summarize therapeutic strategies for manipulating tumor hypoxia and acidosis.
Main Methods:
- Comprehensive literature review of preclinical and clinical studies.
- Analysis of drugs targeting aerobic glycolysis, proton transporters, and hypoxia-inducible factors.
Main Results:
- Dysregulated hypoxia response pathways (HIF1α, mTOR, UPR) in tumors exacerbate hypoxia and acidosis.
- Tumor acidosis enhances metastatic potential and confers drug resistance.
- Several drugs targeting these pathways are under clinical and preclinical development.
Conclusions:
- Targeting tumor aerobic glycolysis, acidosis, and hypoxia offers a promising therapeutic strategy.
- Manipulating these common tumor phenotypes can provide significant clinical benefit for cancer patients.
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