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Inhibitory effects of transforming growth factor-beta1 pretreatment on experimental pulmonary metastasis of MCS-1
N Fujisawa1, N L Sato, T I Motoyama
1Institute for Laboratory Animals, Niigata University School of Medicine, Japan. arinomi@med.niigata-u.ac.jp
Abstract:
Recent studies have suggested that transforming growth factor(TGF)-beta1 acts as a multifunctional regulator of cell growth, and also modifies tumor progression and metastasis. In the present study, we investigated the effects of TGF-beta1 on the proliferation and experimental pulmonary metastasis of MCS-1. MCS-1 are undifferentiated type cloned tumor cells established from a mesenchymal chondrosarcoma which spontaneously occurred in the soft tissue of a female Chinese hamster. MCS-1 cells were pretreated with TGF-beta1 (0, 0.05, 0.5, 2, 10 ng/ml) for 72 hours in a medium containing 1% fetal bovine serum, then tested for in vitro growth by the MTT method, in vivo growth by subcutaneous inoculation into athymic nude mice (1 x 10(6) cells/mouse) and experimental pulmonary metastasis by injection into the lateral tail vein of athymic nude mice (5 x 10(4) cells/mouse). TGF-beta1 significantly inhibited in vitro growth of MCS-1, depending on its concentrations, and also experimental metastasis with maximal inhibition at 0.5 or 2 ng/ml treatment compared to untreated controls. TGF-beta1, however, was ineffective for in vivo subcutaneous growth of MCS-1. These results indicated that TGF-beta1 might be an inhibitor of metastasis of mesenchymal chondrosarcomas including other types of non-epitherial cartilage or bone formation tumors.
Insights
Transforming growth factor-beta1 (TGF-beta1) inhibits the growth and metastasis of mesenchymal chondrosarcoma cells in vitro. This finding suggests TGF-beta1
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Transforming growth factor-beta1 (TGF-beta1) is a key regulator of cell growth, tumor progression, and metastasis.
- Mesenchymal chondrosarcoma (MCS) is a rare bone tumor with a tendency for metastasis.
Purpose of the Study:
- To investigate the effects of TGF-beta1 on the proliferation and experimental pulmonary metastasis of MCS-1 cells.
- To determine the potential of TGF-beta1 as a therapeutic agent for mesenchymal chondrosarcomas.
Main Methods:
- MCS-1 cells were pretreated with varying concentrations of TGF-beta1.
- In vitro growth was assessed using the MTT assay.
- In vivo subcutaneous growth and experimental pulmonary metastasis were evaluated in athymic nude mice.
Main Results:
- TGF-beta1 significantly inhibited MCS-1 cell proliferation in vitro in a dose-dependent manner.
- TGF-beta1 markedly reduced experimental pulmonary metastasis of MCS-1 cells, with maximal inhibition observed at 0.5 and 2 ng/ml.
- TGF-beta1 did not affect the in vivo subcutaneous growth of MCS-1 cells.
Conclusions:
- TGF-beta1 acts as an inhibitor of metastasis for mesenchymal chondrosarcomas.
- These findings suggest that TGF-beta1 may hold therapeutic potential for non-epithelial cartilage and bone tumors.
- Further research is warranted to explore TGF-beta1's role in other tumor types.