Abstract:
BACKGROUND:Although there is no doubt that bisphosphonates (BPs), specific inhibitors of osteoclasts, are beneficial for the treatment of bone metastases, their effects on visceral metastases are unclear. The effect of zoledronic acid (ZOL) was examined in vivo on lung metastasis progression and animal survival, and in vitro on the cellular mechanisms involved. METHODS:An animal model of lung metastasis was developed in C3H/He mice inoculated intravenously with a spontaneous murine osteosarcoma POS-1 cell line. Lung metastasis was determined at the time of autopsy. ZOL was assessed in vitro on POS-1 cell proliferation, cell cycle progression, and caspase-1 and -3 activities. RESULTS:The overall survival in five independent experiments (two series treated with ZOL 0.1 mg/kg twice a week, and three series with 0.1 mg/kg five times a week) showed a significant increase of the actuarial survival: 0.422 +/- 0.07 in ZOL-treated animals versus 0.167 +/- 0.07 in controls (P = 0.036). Lung metastases were absent in all ZOL-treated mice that survived more than 21 days postinjection as revealed by macroscopic and histologic analysis. In vitro, a 48-hour incubation with 10 microM ZOL inhibited POS-1 cell line proliferation associated with cell cycle arrest in S-phase. In addition, ZOL induced a weak increase of caspase-3 activity, but not caspase-1. CONCLUSION:We demonstrate that ZOL exerts a direct antitumor effect on POS-1 cells in vitro, significantly diminishes osteosarcoma-induced lung metastasis in vivo, thereby prolonging survival of POS-1-inoculated animals.
journal_name
Cancerjournal_title
Cancerauthors
Ory B,Heymann MF,Kamijo A,Gouin F,Heymann D,Redini Fdoi
10.1002/cncr.21530subject
Has Abstractpub_date
2005-12-01 00:00:00pages
2522-9issue
11eissn
0008-543Xissn
1097-0142journal_volume
104pub_type
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