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Glutamine Metabolism in Gliomas
Monika Szeliga1, Jan Albrecht2
1Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Pawińskiego St. 5, 02-106, Warsaw, Poland. mszeliga@imdik.pan.pl.
Advances in Neurobiology
|November 26, 2016
Summary
Brain tumor cells, particularly gliomas, rely on glutamine for growth. Blocking glutamine uptake or its metabolic pathways could be a novel therapeutic strategy against these aggressive brain tumors.
Area of Science:
- Neuro-oncology
- Cancer Metabolism
- Molecular Biology
Background:
- Brain tumors, classified by WHO into grades I-IV, include gliomas as a frequent type.
- Glia-derived tumor cells depend on glutamine (Gln) uptake via ASCT2 and SN1 carriers for growth.
- Glutamine fuels tumor growth through its conversion to glutamate (Glu) or by entering metabolic pathways.
Purpose of the Study:
- To investigate the role of glutamine metabolism in glioma proliferation and invasion.
- To explore the potential of targeting glutamine transporters and metabolic enzymes for therapeutic intervention.
- To understand how glioma cells manipulate glutamine metabolism for survival and resistance.
Main Methods:
- Analysis of WHO brain tumor classification criteria (histological, morphological, malignancy).
- Investigation of glutamine (Gln) uptake mechanisms (ASCT2, SN1) in glia-derived tumor cells.
- Study of phosphate-activated glutaminase (GA) activity (KGA) and its role in glutamate (Glu) production.
- Examination of the xc- transporter's role in glutamate-cysteine exchange and glutathione (GSH) synthesis.
Main Results:
- Glioma cells exhibit dependence on glutamine (Gln) for proliferation and invasion.
- Glutamine-derived glutamate (Glu) promotes tumor cell invasion and proliferation.
- Glioma cells lack a subclass of liver-type GA, enabling potential phenotype manipulation.
- Glutamate (Glu) export via xc- transporter leads to increased intracellular glutathione (GSH), enhancing resistance to therapy.
Conclusions:
- Glutamine metabolism is a critical vulnerability in gliomas.
- Targeting glutamine uptake or metabolism presents a promising therapeutic strategy for brain tumors.
- Understanding glutamate-glutathione interplay is key to overcoming therapeutic resistance in gliomas.
