Using 16α-[18F]-Fluoro-17β-Estradiol PET to Visualize Estrogen Receptor α Expression in Human Breast Cancer Xenografts in Female Ovariectomized Mice.

IF 1.2 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES
Sadia Quazi, Nhi Huynh, Angela Rigopoulos, Alexander McDonald, Uwe Ackermann, Andrew Mark Scott, Ingrid Julienne Georgette Burvenich
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引用次数: 0

Abstract

To demonstrate how estrogen receptor alpha (ERα) positive breast cancer xenografts may be visualized in BALB/c nude mice using 16α-[18F]-fluoro-17β-estradiol (18F-FES) positron emission tomography (PET), ovariectomized BALB/c nude mice were injected with ERα-positive breast cancer cells (MCF-7, 3 × 106 cells; shoulder [n = 10] or 4th inguinal mammary fat pad [n = 10]) or ERα-negative breast cancer cells (MDA-MB-231, 1 × 106 cells; mammary fat pad [n = 5]). Mice harboring MCF-7 cells received subcutaneous injections of 20 µg of 17β-estradiol (20 µg/20 µL; corn oil:ethanol, 9:1) in the nape of their necks 2 days prior to cell injection, followed by daily injections five times per week for 5 weeks. Tumor volumes were measured according to the formula: (L*W2)/2 (L; length, W; width). Once tumor volumes reached approximately 100 mm3, 17β-estradiol injections were halted 2 days prior to mice receiving 18F-FES for PET imaging to avoid competitive binding with ERα. Upon 18F-FES administration via the lateral tail vein, PET/MRI was performed for 15 min at 1 h to 1.5 h post-injection. 18F-FES uptake was not observed in ERα-negative, MDA-MB-231 tumor-bearing mice. 18F-FES uptake was most pronounced in mice harboring MCF-7 tumors in the shoulder. In MCF-7 tumors grown in the inguinal mammary fat pad, 18F-FES uptake was less visible, as the intestinal excretion pattern of 18F-FES obscured the radioactivity detectable in these tumors. To use 18F-FES PET as a tool to visualize ERα expression in ERα-positive breast xenografts, we demonstrate that the visibility of 18F-FES uptake is clear in tumors located away from the abdominal region of mice, such as in the shoulder.

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来源期刊
Jove-Journal of Visualized Experiments
Jove-Journal of Visualized Experiments MULTIDISCIPLINARY SCIENCES-
CiteScore
2.10
自引率
0.00%
发文量
992
期刊介绍: JoVE, the Journal of Visualized Experiments, is the world''s first peer reviewed scientific video journal. Established in 2006, JoVE is devoted to publishing scientific research in a visual format to help researchers overcome two of the biggest challenges facing the scientific research community today; poor reproducibility and the time and labor intensive nature of learning new experimental techniques.
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