Expression and function of hexose transporters GLUT1, GLUT2, and GLUT5 in breast cancer-effects of hypoxia
| Autor: | Frank Wuest, Darryl D. Glubrecht, Daniel Krys, Vincent Bouvet, Melinda Wuest, Larissa J. Vos, Alison Marshall, John R. Mackey, Ingrit Hamann |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
endocrine system Monosaccharide Transport Proteins Mice Nude Standardized uptake value Breast Neoplasms Fructose Biochemistry 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Fluorodeoxyglucose F18 Cell Line Tumor Genetics Animals Humans Hexose Breast Hypoxia Molecular Biology Cytochalasin B chemistry.chemical_classification Glucose Transporter Type 2 Glucose Transporter Type 1 biology Glucose Transporter Type 5 Glucose transporter Biological Transport Molecular biology Immunohistochemistry 030104 developmental biology Glucose chemistry 030220 oncology & carcinogenesis Positron-Emission Tomography biology.protein MCF-7 Cells GLUT2 GLUT1 Female GLUT5 Biotechnology |
| Zdroj: | FASEB journal : official publication of the Federation of American Societies for Experimental Biology. 32(9) |
| ISSN: | 1530-6860 |
| Popis: | Elevated growth in breast cancer (BC) activates hypoxia-inducible factor (HIF1α) and downstream, facilitative glucose transporter 1 (GLUT1), which can be visualized with 2-deoxy-2-[18F]fluoro-d-glucose ([18F]FDG). GLUT5 (fructose) and GLUT2 (glucose/fructose) might provide alternative targets for BC imaging as to why effects of hypoxia on GLUT1/2/5 levels and function were examined in human BC models. GLUT1/2/5 and HIF1α mRNA was analyzed in BC patient biopsies. In MCF10A, MCF7, and MDA-MB231 cells, [18F]FDG, 6-deoxy-6-[18F]fluoro-d-fructose (6-[18F]FDF) and [18F]-fluoroazomycin arabinoside were used in radiotracer experiments, whereas GLUT1/2/5 mRNA was analyzed with real-time PCR and protein levels determined via Western blot/immunohistochemistry. Positron emission tomography imaging was performed in MCF7 and MDA-MB231 tumor-bearing mice. Glucose/fructose/cytochalasin B reduced cellular 6-[18F]FDF uptake by 50%, indicating functional involvement of GLUT2. With GLUT5 staining lower than GLUT1, 6-[18F]FDF revealed lower uptake than [18F]FDG [standardized uptake value (SUV)6-[18F]FDF, 120 min 0.77 ± 0.06 vs. SUV[18F]FDG, 120 min 1.08 ± 0.07] in MDA-MB231 tumors and was blocked by 20% with cytochalasin B after 10 min. Whereas correspondence between 6-[18F]FDF uptake and GLUT5 protein was low, high GLUT2 levels were detected in all cell lines and tumor models. Besides GLUT1, GLUT5 seems to be regulated under hypoxia on the molecular and functional level. Additionally, results strongly support a functional involvement of GLUT2 in fructose metabolism, possibly by compensating for the weaker expression and function of GLUT5 in BC.-Hamann, I., Krys, D., Glubrecht, D., Bouvet, V., Marshall, A., Vos, L., Mackey, J. R., Wuest, M., Wuest, F. Expression and function of hexose transporters GLUT1, GLUT2, and GLUT5 in breast cancer-effects of hypoxia. |
| Databáze: | OpenAIRE |
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