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Osteoporotic bone of miR-150-deficient mice: Possibly due to low serum OPG-mediated osteoclast activation
Sik-Won Choi1, Su Ui Lee2, Eun Hye Kim1
1Laboratory of Translational Therapeutics, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea.
Abstract:
MicroRNA (miR)-150 has been shown to control B and T cell differentiation in the bone marrow. The regulation of B and T cells is directly or systematically associated with bone remodeling cells such as osteoclasts; however, the functional role of miR-150 in bone homeostasis has not been well studied. Here, we observed down-regulation of miR-150 during in vitro osteoclast differentiation and, furthermore, that miR-150 knockout mice exhibit decreased bone mass and an increased number of osteoclasts. miR-150 deficiency did not affect osteoclast differentiation, but miR150 knockout mice had significantly lower osteoprotegrin (OPG) serum levels, suggesting that the reduction of serum OPG level in miR-150 knockout mice might induce B cell expansion and subsequently increase serum levels of immunoglobulins for activating osteoclast differentiation.
Insights
MicroRNA-150 (miR-150) deficiency in mice leads to lower bone mass and more osteoclasts. Reduced miR-150 impacts osteoprotegerin levels, potentially affecting B cells and bone remodeling.
Area of Science:
- Immunology
- Bone Biology
- Molecular Biology
Background:
- MicroRNA-150 (miR-150) is known to regulate B and T cell differentiation.
- B and T cell regulation is linked to bone remodeling cells like osteoclasts.
- The specific role of miR-150 in maintaining bone homeostasis remains largely uncharacterized.
Purpose of the Study:
- To investigate the functional role of miR-150 in bone homeostasis.
- To determine the impact of miR-150 on osteoclast differentiation and bone mass.
Main Methods:
- Observation of miR-150 expression during in vitro osteoclast differentiation.
- Analysis of bone mass and osteoclast numbers in miR-150 knockout mice.
- Measurement of serum osteoprotegerin (OPG) levels in knockout mice.
Main Results:
- miR-150 expression was down-regulated during in vitro osteoclast differentiation.
- miR-150 knockout mice displayed reduced bone mass and an increased osteoclast count.
- While osteoclast differentiation was unaffected by miR-150 deficiency, serum OPG levels were significantly lower in knockout mice.
Conclusions:
- miR-150 plays a role in regulating bone homeostasis.
- Reduced miR-150 levels may lead to decreased serum OPG, potentially promoting B cell expansion.
- This B cell expansion could subsequently increase immunoglobulin levels, driving osteoclast differentiation and affecting bone mass.