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Updated: Sep 2, 2025
09:37
A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation
Published on: March 15, 2018
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Human mast cells induce osteoclastogenesis through cell surface RANKL
Chun Wai Ng1, Ben Chung Lap Chan2, Chun Hay Ko2
1School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, SAR, China.
Summary
Mast cells initiate osteoclast proliferation and activation via cell surface RANKL, suggesting a role in bone destruction in conditions like osteoporosis. This finding highlights mast cells as potential contributors to bone disease pathogenesis.
Area of Science:
- Immunology
- Bone Biology
- Cell Biology
Background:
- Osteoporosis is a significant bone disease characterized by reduced bone mass and increased fracture risk.
- Mast cells are immune cells implicated in various inflammatory conditions.
- The role of mast cells in bone metabolism, particularly in osteoporosis, remains incompletely understood.
Purpose of the Study:
- To investigate the potential contribution of human mast cells (HMC) to osteoporosis pathogenesis.
- To determine if HMC regulate osteoclast proliferation and activation.
Main Methods:
- Co-culture of CD34+-derived HMC with human monocyte-derived osteoclast precursors.
- Assessment of osteoclast maturation, tartrate-resistant acid phosphatase (TRAP) expression, and bone resorption activity.
- Flow cytometry to confirm RANKL expression on HMC.
Main Results:
- HMC induced osteoclast maturation and bone resorption in the absence of RANKL.
- Mast cell activators did not affect HMC-induced osteoclast activity.
- Osteoprotegerin (OPG) reversed HMC-induced osteoclast activity, indicating RANKL involvement.
- HMC express RANKL on their cell surface, independent of activation status.
Conclusions:
- Mast cells directly initiate osteoclast proliferation and activation through cell surface RANKL.
- Mast cells may play a significant role in bone destruction associated with osteoporosis.
- Targeting mast cell-osteoclast interactions could offer new therapeutic strategies for osteoporosis.
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