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Statins impair glucose uptake in tumor cells
Agata Malenda1, Anna Skrobanska, Tadeusz Issat
1Department of Immunology, Center of Biostructure Research, Medical University of Warsaw, Warsaw, Poland.
Abstract:
Statins, HMG-CoA reductase inhibitors, are used in the prevention and treatment of cardiovascular diseases owing to their lipid-lowering effects. Previous studies revealed that, by modulating membrane cholesterol content, statins could induce conformational changes in cluster of differentiation 20 (CD20) tetraspanin. The aim of the presented study was to investigate the influence of statins on glucose transporter 1 (GLUT1)-mediated glucose uptake in tumor cells. We observed a significant concentration- and time-dependent decrease in glucose analogs' uptake in several tumor cell lines incubated with statins. This effect was reversible with restitution of cholesterol synthesis pathway with mevalonic acid as well as with supplementation of plasma membrane with exogenous cholesterol. Statins did not change overall GLUT1 expression at neither transcriptional nor protein levels. An exploratory clinical trial revealed that statin treatment decreased glucose uptake in peripheral blood leukocytes and lowered (18)F-fluorodeoxyglucose ((18)F-FDG) uptake by tumor masses in a mantle cell lymphoma patient. A bioinformatics analysis was used to predict the structure of human GLUT1 and to identify putative cholesterol-binding motifs in its juxtamembrane fragment. Altogether, the influence of statins on glucose uptake seems to be of clinical significance. By inhibiting (18)F-FDG uptake, statins can negatively affect the sensitivity of positron emission tomography, a diagnostic procedure frequently used in oncology.
Insights
Statins significantly reduce glucose uptake in tumor cells by affecting glucose transporter 1 (GLUT1) function, not expression. This finding impacts cancer diagnostics like positron emission tomography (PET) scans.
Area of Science:
- Biochemistry
- Oncology
- Pharmacology
Background:
- Statins are lipid-lowering drugs impacting cardiovascular health.
- Statins modulate membrane cholesterol, influencing protein conformation, such as CD20.
- The effect of statins on glucose metabolism in cancer cells is not well understood.
Purpose of the Study:
- To investigate the impact of statins on glucose transporter 1 (GLUT1)-mediated glucose uptake in tumor cells.
- To explore the clinical relevance of statins' effects on glucose uptake.
Main Methods:
- In vitro studies using tumor cell lines to measure glucose analog uptake with statin treatment.
- Reversibility assays using mevalonic acid and exogenous cholesterol.
- Analysis of GLUT1 expression at transcriptional and protein levels.
- Exploratory clinical trial in a mantle cell lymphoma patient.
- Bioinformatics analysis of GLUT1 structure and cholesterol-binding motifs.
Main Results:
- Statins caused a concentration- and time-dependent decrease in glucose uptake in tumor cells.
- The effect was reversible upon restoring cholesterol synthesis or adding exogenous cholesterol.
- Statins did not alter GLUT1 expression levels.
- Clinical data showed reduced leukocyte and tumor (18)F-FDG uptake in a patient on statins.
- Bioinformatics identified potential cholesterol-binding sites in GLUT1.
Conclusions:
- Statins inhibit GLUT1-mediated glucose uptake in tumor cells through a mechanism independent of GLUT1 expression, likely involving cholesterol modulation.
- Statin-induced reduction in (18)F-FDG uptake may compromise the sensitivity of PET scans used in oncology.
- Further research is warranted to understand the clinical implications of statins on cancer imaging and metabolism.
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