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miR-214 targets ATF4 to inhibit bone formation
Xiaogang Wang1, Baosheng Guo, Qi Li
1State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China.
Abstract:
Emerging evidence indicates that microRNAs (miRNAs) have important roles in regulating osteogenic differentiation and bone formation. Thus far, no study has established the pathophysiological role for miRNAs identified in human osteoporotic bone specimens. Here we found that elevated miR-214 levels correlated with a lower degree of bone formation in bone specimens from aged patients with fractures. We also found that osteoblast-specific manipulation of miR-214 levels by miR-214 antagomir treatment in miR-214 transgenic, ovariectomized, or hindlimb-unloaded mice revealed an inhibitory role of miR-214 in regulating bone formation. Further, in vitro osteoblast activity and matrix mineralization were promoted by antagomir-214 and decreased by agomir-214, and miR-214 directly targeted ATF4 to inhibit osteoblast activity. These data suggest that miR-214 has a crucial role in suppressing bone formation and that miR-214 inhibition in osteoblasts may be a potential anabolic strategy for ameliorating osteoporosis.
Insights
MicroRNAs (miRNAs) play a role in bone formation. Elevated miR-214 levels in patients with fractures correlate with reduced bone formation, suggesting it as a therapeutic target for osteoporosis.
Area of Science:
- Molecular Biology
- Bone Biology
- Biochemistry
Background:
- MicroRNAs (miRNAs) are increasingly recognized for their regulatory roles in osteogenic differentiation and bone formation.
- The specific pathophysiological function of miRNAs in human osteoporotic bone remains largely unestablished.
- Osteoporosis is a significant public health concern characterized by reduced bone mass and increased fracture risk.
Purpose of the Study:
- To investigate the role of microRNA-214 (miR-214) in the pathogenesis of osteoporosis.
- To determine the effect of miR-214 on osteoblast activity and bone formation.
- To identify potential therapeutic strategies targeting miR-214 for osteoporosis treatment.
Main Methods:
- Analysis of miR-214 levels in human osteoporotic bone specimens from aged patients with fractures.
- In vivo studies using miR-214 transgenic mice, ovariectomized mice, and hindlimb-unloaded mice treated with miR-214 antagomir.
- In vitro experiments assessing osteoblast activity and matrix mineralization using antagomir-214 and agomir-214.
- Identification of miR-214's direct target gene, ATF4.
Main Results:
- Elevated miR-214 levels were found to correlate with decreased bone formation in human osteoporotic bone.
- Osteoblast-specific manipulation of miR-214 demonstrated its inhibitory effect on bone formation in mouse models.
- In vitro studies showed that miR-214 inhibition (antagomir-214) promoted osteoblast activity and mineralization, while miR-214 overexpression (agomir-214) suppressed them.
- miR-214 was confirmed to directly target ATF4, thereby inhibiting osteoblast activity.
Conclusions:
- miR-214 plays a critical role in suppressing bone formation.
- Inhibition of miR-214 in osteoblasts presents a potential anabolic therapeutic strategy for managing osteoporosis.
- Targeting miR-214 may offer a novel approach to enhance bone formation and combat bone loss.
