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Published on: February 7, 2025
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Nrf2 is required for normal postnatal bone acquisition in mice.
Jung-Hyun Kim1, Vandana Singhal2, Shyam Biswal1
1Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health , Baltimore, MD, USA.
Bone Research
|August 15, 2015
Summary
The transcription factor Nrf2 is crucial for bone development. Mice lacking Nrf2 show significantly reduced bone growth due to impaired osteoblast formation, suggesting Nrf2 as a therapeutic target for osteoporosis.
Area of Science:
- Skeletal Biology
- Cellular Metabolism
- Oxidative Stress
Background:
- Reactive species contribute to cellular dysfunction and impact bone metabolism.
- Nuclear factor erythroid 2-related factor 2 (Nrf2) is a key regulator of antioxidant and cellular defense pathways.
- The specific role of Nrf2 in skeletal biology remains underexplored.
Purpose of the Study:
- To investigate the role of Nrf2 in postnatal bone metabolism in mice.
- To determine the impact of Nrf2 deficiency on bone acquisition and osteoblastogenesis.
Main Methods:
- Utilized Nrf2-deficient (Nrf2(-/-)) mice and control littermates.
- Assessed bone acquisition and osteoblast numbers at different ages.
- Evaluated the function of primary osteoblasts and bone marrow stromal cells (BMSCs) in vitro.
- Investigated the effect of N-acetyl cysteine (NAC) on BMSC colony-forming capacity.
Main Results:
- Nrf2(-/-) mice displayed a significant deficit in postnatal bone acquisition, most pronounced at 3 weeks.
- Osteoblast numbers were markedly reduced (12-fold) in Nrf2(-/-) mice compared to controls.
- While primary osteoblasts functioned normally in vitro, BMSCs from Nrf2(-/-) mice showed reduced colony-forming capacity.
- Treatment with NAC rescued the BMSC defect, indicating reactive species stress impairs osteoblastogenesis.
Conclusions:
- Nrf2 plays a critical role in regulating postnatal bone metabolism and osteoblastogenesis.
- Impaired Nrf2 function leads to reduced bone acquisition, potentially due to increased oxidative stress in BMSCs.
- Nrf2 represents a promising therapeutic target for conditions like osteoporosis.
