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Glutamine Flux Imaging Using Genetically Encoded Sensors
Published on: July 31, 2014
Real-time NMR analysis of glutamine metabolism for screening anti-cancer agents in living cells
Yating Lei1,2, Tao Huang1,2, Xin Chai1,2
1State Key Laboratory of Magnetic Resonance Spectroscopy and Imaging, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement of Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China.
Abstract:
Metabolic reprogramming is a substantial obstacle for anticancer drug screening, as targeted therapeutics often lose efficiency due to the dynamic adaption of cancer cells. Glutamine metabolism in cancer profoundly impacts tumor initiation, progression and metastasis. The existing agents are compromised by resistance and off-target toxicity. In this study, a real-time NMR tracking method for intracellular glutamine metabolic flux was established. This method enables comprehensive profiling of nitrogen metabolism and serves as a valuable tool for characterizing specific cancer metabolic phenotypes and screening drugs against targeted cancer cells. Applying this approach to traditional Chinese medicine (TCM) discovery, we identified Astragalus membranaceus as a potent regulator of glutamine metabolism. Through virtual screening via molecular docking, 12 potential compounds from Astragalus membranaceus were initially flagged as candidate binders toward the allosteric pocket of glutaminase 1 (GLS1). Crucially, subsequent in vitro recombinant human GLS1 enzyme activity assays successfully ruled out computational false positives and demonstrated that Compound 2 (quercetin) acts as the exclusive, direct enzymatic inhibitor among the tested monomers, capable of effectively suppressing GLS1 activity. Overall, this work provides a robust platform for real-time metabolic profiling of glutamine metabolism and drug screening at the living cell level, and offers new insights into the mechanisms of TCMs in anticancer therapy.
Insights
Researchers developed a real-time method to track cancer cell metabolism, identifying quercetin from Astragalus membranaceus as a direct inhibitor of glutaminase 1 (GLS1) for potential anticancer drug screening.
Area of Science:
- Biochemistry
- Oncology
- Pharmacology
Background:
- Metabolic reprogramming in cancer hinders drug screening efficacy due to cellular adaptation.
- Glutamine metabolism is crucial for cancer progression, but current therapies face resistance and toxicity.
- Targeting cancer metabolism offers a promising avenue for novel therapeutic strategies.
Purpose of the Study:
- To establish a real-time method for tracking intracellular glutamine metabolic flux for cancer cell profiling and drug screening.
- To identify regulators of glutamine metabolism from Traditional Chinese Medicine (TCM).
- To investigate the inhibitory mechanism of identified compounds on glutaminase 1 (GLS1).
Main Methods:
- Development of a real-time Nuclear Magnetic Resonance (NMR) tracking method for intracellular glutamine metabolic flux.
- Virtual screening using molecular docking to identify potential GLS1 inhibitors from *Astragalus membranaceus* compounds.
- In vitro enzymatic assays using recombinant human GLS1 to validate inhibitory activity.
Main Results:
- The real-time NMR method successfully profiled nitrogen metabolism and characterized cancer metabolic phenotypes.
- Twelve compounds from *Astragalus membranaceus* were computationally identified as potential GLS1 binders.
- Quercetin (Compound 2) was confirmed as a direct and exclusive enzymatic inhibitor of GLS1, suppressing its activity.
Conclusions:
- A robust platform for real-time metabolic profiling and drug screening at the cellular level was established.
- Quercetin demonstrates potential as an anticancer therapeutic by directly inhibiting GLS1.
- This study provides insights into TCM mechanisms for anticancer therapy and highlights GLS1 as a drug target.
