王 晉(Wang Jin，Dept Orthop Oncol，1st Affil Hosp Zhongshan Univ，Guangzhou 510080)…∥Chin J Orthop.－2011，31(1).－71～78

Biological behaviors of two novel syngeneic human osteosarcoma cell lines

王 晉(Wang Jin，Dept Orthop Oncol，1st Affil Hosp Zhongshan Univ，Guangzhou 510080)…∥Chin J Orthop.－2011，31(1).－71～78

ObjectiveTo characterize and compare the different biological behaviors of two novel human osteosarcoma cell lines，Zos and Zos-M，established respectively from the primary site and the skip metastasis of an osteosarcoma patient.MethodsTwo novel human osteosarcoma cell lines，Zos and Zos-M，were developed using tissue plant culture method.The vitro examinations included observations of morphology，analysis of karyotype and cell cycle，calculation of doubling time and growth curve，detection of osteoblastic markers and matrigel invasion assay.Subcutaneous，intratibial and intravenous inoculations into nude mice were performed to study the in vivo tumorigenicity and metastatic potentials of both cell lines.MTT were used to detect sensitivity of the cell lines to chemotherapeutic drugs.RT-PCR was performed to assess the expression of and some metastasis-related genes.ResultsBoth cell lines proliferated actively and remained stable for more than 100 passages in vitro without interruption.The morphology and expression of osteoblastic markers of Zos and Zos-M were conformed to the characteristic of osteosarcoma.The karyotype analysis displayed aneuploidy and various structural abnormalities.The population doubling time of Zos and Zos-M were 33.65 h and 31.58 h respectively.Both cell lines were less sensitive to the current chemotherapy protocols compared to U-2OS.Zos and Zos-M were 100%tumorigenic by subcutaneous and othotopic injection.37.5%of nude mice injected Zos-M and none of nude mice injected Zos developed lung metastasis after intravenous injection.The comparison of the expression patterns of some metastasis-related genes revealed that the decreased expression of cadherin-11 in Zos-M may correlate with a high potential of metastases.ConclusionThe two novel established human osteosarcoma cell lines，Zos and Zos-M and related animal models could serve as models for the study of drug resistance and screening of new thera-peutics for osteosarcoma.In addition，the study also provide tools for the study of metastasis because the same genetic background and different potential of metastasis of Zos and Zos-M.19 refs，8 figs，2 tabs.

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