melanoma cells,
U87MG human glioblastoma cells, and MDA-231 human breast cancer cells
were purchased from the American Type Culture Collection and grown
in DMEM with 10% fetal bovine serum at 37 °C with 5% CO2. Cells were used for in vitro or in vivo experiments when they reached
approximately 75% confluence.
Male C57BL/6 Jms and male BALB/c
nude–/– mice (7-week-old) were purchased
from Japan SLC (Shizuoka, Japan). All animals received humane care,
and the Animal Ethics Committee of the National Institute of Radiological
Sciences approved all experiments. All experiments were carried out
according to the recommendations of the Committee for the Care and
Use of Laboratory Animals, National Institute of Radiological Sciences.
The B16F10 tumor bearing models were established using C57BL/6 J mice
via a left flank subcutaneous injection of B16F10 cells (1 ×
106 cells per mouse) one week before the PET imaging experiment.
The U87MG and MDA-231 tumor bearing models were established using
BALB/c nude–/– mice via a left hind leg or
left flank subcutaneous injection of U87MG cells (5 × 106 cells per mouse) and MDA-231 cells (5 × 106 cells per mouse), respectively. Tumor bearing mice were used for
studies when tumor diameters reached 3–5 mm.