Related Experiment Video
Updated: Oct 6, 2025
Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
Published on: December 30, 2016
Targeting glutamine metabolism network for the treatment of therapy-resistant prostate cancer
Lingfan Xu1, Bing Zhao1, William Butler1
1Department of Pathology, Duke University School of Medicine, Durham, NC, 27710, USA.
Abstract:
Advanced and aggressive prostate cancer (PCa) depends on glutamine for survival and proliferation. We have previously shown that inhibition of glutaminase 1, which catalyzes the rate-limiting step of glutamine catabolism, achieves significant therapeutic effect; however, therapy resistance is inevitable. Here we report that while the glutamine carbon is critical to PCa survival, a parallel pathway of glutamine nitrogen catabolism that actively contributes to pyrimidine assembly is equally important for PCa cells. Importantly, we demonstrate a reciprocal feedback mechanism between glutamine carbon and nitrogen pathways which leads to therapy resistance when one of the two pathways is inhibited. Combination treatment to inhibit both pathways simultaneously yields better clinical outcome for advanced PCa patients.
Insights
Advanced prostate cancer relies on glutamine. Inhibiting both its carbon and nitrogen pathways simultaneously improves treatment outcomes and overcomes therapy resistance in prostate cancer (PCa) patients.
Area of Science:
- Oncology
- Metabolic pathways
- Cancer cell metabolism
Background:
- Advanced prostate cancer (PCa) is highly dependent on glutamine for survival and proliferation.
- Previous research demonstrated therapeutic effects of inhibiting glutaminase 1, a key enzyme in glutamine metabolism, but resistance remains a challenge.
Purpose of the Study:
- To investigate the role of glutamine's carbon and nitrogen catabolism in prostate cancer.
- To explore the reciprocal feedback mechanisms between these pathways and their contribution to therapy resistance.
- To evaluate the efficacy of combination therapy targeting both glutamine pathways.
Main Methods:
- Analysis of glutamine metabolism in advanced prostate cancer cells.
- Investigation of parallel pathways for glutamine carbon and nitrogen utilization.
- Assessment of feedback mechanisms between metabolic pathways.
- Clinical evaluation of combination therapy targeting both glutamine pathways.
Main Results:
- Glutamine carbon is crucial for PCa survival, but glutamine nitrogen catabolism is equally vital for pyrimidine synthesis.
- A reciprocal feedback loop exists between glutamine carbon and nitrogen pathways, leading to resistance when only one is inhibited.
- Simultaneous inhibition of both pathways resulted in improved clinical outcomes for advanced PCa patients.
Conclusions:
- Targeting both glutamine carbon and nitrogen catabolism is a promising strategy for advanced prostate cancer.
- Combination therapy overcomes therapy resistance mediated by reciprocal feedback between glutamine metabolic pathways.
- This approach offers a new therapeutic avenue for patients with advanced and aggressive prostate cancer.
Related Concept Videos
02:57Targeted Cancer Therapies
There are several types of targeted therapies against...
02:26Protein Networks
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...