Fig. 2.
Digital radiography of tumors in the hind legs of nude mice. Mice were injected intraperitoneally with PBS, PBS liposomes, or clodronate liposomes one day prior to the intratibial injection of 2 × 105 PC-3MM2, PC-3MM2-NS shRNA, or PC-3MM2-IL-6 shRNA cells. Extensive bone lysis was found in mice with PC-3MM2 and PC-3MM2-NS shRNA tumors treated with PBS or PBS liposomes. There was significant preservation of bone in mice injected with cells transfected with IL-6 shRNA (PC-3MM2-IL-6 shRNA) and mice treated with clodronate liposomes. The most important outcome (no lysis) was achieved by the combination of knockdown of IL-6 in tumor cells and treatment of mice with clodronate liposomes.