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http://dx.doi.org/10.3345/kjp.2016.59.9.374

Metformin displays in vitro and in vivo antitumor effect against osteosarcoma  

Ko, Yunmi (Division of Clinical Translational Research, Korea Cancer Center Hospital)
Choi, Aery (Department of Pediatrics, Korea Cancer Center Hospital)
Lee, Minyoung (Division of Radiation Effect, Korea Institute of Radiological and Medical Sciences)
Lee, Jun Ah (Division of Clinical Translational Research, Korea Cancer Center Hospital)
Publication Information
Clinical and Experimental Pediatrics / v.59, no.9, 2016 , pp. 374-380 More about this Journal
Abstract
Purpose: Patients with unresectable, relapsed, or refractory osteosarcoma need a novel therapeutic agent. Metformin is a biguanide derivative used in the treatment of type II diabetes, and is recently gaining attention in cancer research. Methods: We evaluated the effect of metformin against human osteosarcoma. Four osteosarcoma cell lines (KHOS/NP, HOS, MG-63, U-2 OS) were treated with metformin and cell proliferation was evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Cell cycle progression and apoptosis were evaluated using flow cytometric analysis, and migration and wound healing assay were performed. Fourteen female Balb/c-nude mice received KHOS/NP cell grafts in their thigh, and were allowed access to metformin containing water (2 mg/mL) ad libitum. Tumor volume was measured every 3-4 days for a period of 4 weeks. Results: Metformin had a significant antiproliferative effect on human osteosarcoma cells. In particular, metformin inhibited the proliferation and migration of KHOS/NP cells by activation of AMP-activated protein kinase and consequent inhibition of the mammalian target of rapamycin pathway. It also inhibited the proliferation of cisplatin-resistant KHOS/NP clone cells. Analysis of KHOS/NP xenograft Balb/c-nude models indicated that metformin displayed potent in vivo antitumor effects. Conclusion: Further studies are necessary to explore metformin's therapeutic potential and the possibilities for its use as an adjuvant agent for osteosarcoma.
Keywords
Metformin; Osteosarcoma; Antitumor effect;
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