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• W1997007038 abstract "The effects of a third-generation bisphosphonate, YM175 (disodium dihydrogen (cycloheptylamino)-methylene-1,1-bisphosphonate), on bone resorption induced by a metastatic human melanoma cell line (A375) were investigated morphologically using an experimental model of bone metastases in nude mice. An injection of A375 in the left cardiac ventricle produced multiple osteolytic lesions. Then, 4 weeks after the cell injection, we administrated YM175 (1 mg/kg) intravenously once and sacrificed the animals 3 days later. On histochemical observation, there was a layer of stromal cells with numerous mononuclear and multinucleated tartrate-resistant acid phosphatase (TRAPase)-positive cells in the untreated control group. In contrast, this layer was extensively reduced in most areas, and only a few TRAPase-positive cells were seen around tumor nests and on the bone surface in the experimental group. Most of the TRAPase-positive cells were stained only weakly and/or homogeneously, and there was little evidence of cell polarity. Some of them were vacuolated. Ultrastructurally, they were round and devoid of ruffled borders and clear zones. The findings suggest that YM175 decreases the number and activity of osteoclasts. In addition, a few showed the morphology of cell death, which seemed to be one of the reasons leading to the decrease of osteoclasts. There was no substantial change in the morphological relationships or ultrastructure of osteoclast precursor cells, stromal cells, extracellular matrices, and tumor cells between the experimental and the control groups. In the experimental group, the distribution of extracellular matrices (heparan sulfate proteoglycan and fibronectin) was less conspicuous, but the localization of osteotropic cytokines (interleukin-6 and prostaglandin E2) was essentially similar to that of the control group. The cause leading to the decrease of osteoclast precursor cells remains to be clarified. In conclusion, YM175 inhibits bone resorption induced by tumor, by decreasing the activity of mature osteoclasts and possibly affecting the production of osteoclast precursor cells." @default.
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• W1997007038 date "1996-01-01" @default.
• W1997007038 modified "2023-10-10" @default.
• W1997007038 title "Inhibitory effects of bisphosphonate (YM175) on bone resorption induced by a metastatic bone tumor" @default.
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• W1997007038 doi "https://doi.org/10.1016/8756-3282(95)00428-9" @default.
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