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Updated: Jun 16, 2026
09:25
Establishment of Cancer Stem Cell Cultures from Human Conventional Osteosarcoma
Published on: October 14, 2016
Osteoclast-like cells in soft tissue leiomyosarcomas.
C L M H Gibbons1, S G Sun, M Vlychou
1Department of Pathology, Nuffield Dept of Orthopaedics, Rheumatology and Musculoskeletal Science, University of Oxford, Nuffield Orthopaedic Centre, Headington, Oxford, OX3 7LD, UK.
Virchows Archiv : an International Journal of Pathology
|February 4, 2010
Summary
Giant cell-rich leiomyosarcomas contain multinucleated giant cells (MNGCs) with an osteoclast-like phenotype. These tumor-associated macrophages differentiate into giant cells via a RANKL-dependent pathway.
Area of Science:
- Oncology
- Pathology
- Cell Biology
Background:
- Giant cell-rich leiomyosarcoma is a rare smooth muscle tumor variant.
- The origin and function of its numerous multinucleated giant cells (MNGCs) are unclear.
Purpose of the Study:
- To investigate the cellular origin and phenotype of MNGCs in giant cell-rich leiomyosarcoma.
- To elucidate the mechanism of MNGC formation in this tumor type.
Main Methods:
- Immunohistochemical analysis of osteoclast, macrophage, and smooth muscle markers in tumor tissues.
- In vitro differentiation studies of tumor-associated macrophages (TAMs).
- Reverse transcription polymerase chain reaction (RT-PCR) for gene expression analysis.
Main Results:
- MNGCs in giant cell-rich leiomyosarcoma exhibited an osteoclast-like phenotype (CD45+, CD68+, TRAP+, CD51+).
- TAMs expressed similar markers and differentiated into osteoclast-like cells in vitro.
- Leiomyosarcoma cells expressed RANKL, a key factor in osteoclast differentiation.
Conclusions:
- The giant cells in giant cell-rich leiomyosarcoma are osteoclast-like cells derived from TAMs.
- MNGC formation is mediated by a RANKL-dependent mechanism involving leiomyosarcoma cells.
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