The Effect of Carbogen Breathing on 18F-FDG Uptake in Non-Small-Cell Lung Cancer.

Abstract

It has been reported that 18F-FDG uptake is higher in hypoxic cancer cells than in well-oxygenated cells. We demonstrated that 18F-FDG uptake in lung cancer would be affected by high concentration oxygen breathing. Methods. Overnight fasted non-small-cell lung cancer A549 subcutaneous (s.c.) xenografts bearing mice (n = 10) underwent 18F-FDG micro-PET scans, animals breathed room air on day 1, and same animals breathed carbogen (95% O2 + 5% CO2) on the subsequent day. In separated studies, autoradiography and immunohistochemical staining visualization of frozen section of A549 s.c. tumors were applied, and to compare between carbogen-breathing mice and those with air breathing, a combination of 18F-FDG and hypoxia marker pimonidazole was injected 1 h before animal sacrifice, and 18F-FDG accumulation was compared with pimonidazole binding and glucose transporter 1 (GLUT-1) expression. Results. PET studies revealed that tumor 18F-FDG uptake was significantly decreased in carbogen-breathing mice than those with air breathing (P < 0.05). Ex vivo studies confirmed that carbogen breathing significantly decreased hypoxic fraction detected by pimonidazole staining, referring to GLUT-1 expression, and significantly decreased 18F-FDG accumulation in tumors. Conclusions. High concentration of O2 breathing during 18F-FDG uptake phase significantly decreases 18F-FDG uptake in non-small-cell lung cancer A549 xenografts growing in mice.

• Authors: Yu Lin, Ying-Na Bao, Cong-Xiu Huang, Ji-Hong Zhang, Zhi-Long Yu, Ye Tian, Xiang-Cheng Wang, Yi-Tong Cui
• Journal: BioMed research international (Biomed Res Int) Vol. 2019 Pg. 2920169 ( 2019) ISSN: 2314-6141 [Electronic] United States
• PMID: 31886195 (Publication Type: Journal Article)
• Copyright: Copyright © 2019 Yu Lin et al.

Chemical References

• Fluorodeoxyglucose F18
• Carbon Dioxide
• carbogen
• Oxygen

Topics

• A549 Cells
• Animals
• Carbon Dioxide (pharmacokinetics, pharmacology)
• Carcinoma, Non-Small-Cell Lung (chemistry, metabolism)
• Disease Models, Animal
• Female
• Fluorodeoxyglucose F18 (analysis, pharmacokinetics)
• Heterografts
• Humans
• Hypoxia (metabolism)
• Immunohistochemistry
• Lung (chemistry, drug effects, metabolism)
• Lung Neoplasms (chemistry, metabolism)
• Mice
• Mice, Nude
• Oxygen (pharmacokinetics, pharmacology)
• Positron-Emission Tomography
• Tissue Distribution