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Inhibition of Midkine Augments Osteoporotic Fracture Healing
Melanie Haffner-Luntzer1, Julia Kemmler1, Verena Heidler1
1Institute of Orthopedic Research and Biomechanics, University Medical Center Ulm, Ulm, Germany.
Abstract:
The heparin-binding growth and differentiation factor midkine (Mdk) is proposed to negatively regulate osteoblast activity and bone formation in the adult skeleton. As Mdk-deficient mice were protected from ovariectomy (OVX)-induced bone loss, this factor may also play a role in the pathogenesis of postmenopausal osteoporosis. We have previously demonstrated that Mdk negatively influences bone regeneration during fracture healing. Here, we investigated whether the inhibition of Mdk using an Mdk-antibody (Mdk-Ab) improves compromised bone healing in osteoporotic OVX-mice. Using a standardized femur osteotomy model, we demonstrated that Mdk serum levels were significantly enhanced after fracture in both non-OVX and OVX-mice, however, the increase was considerably greater in osteoporotic mice. Systemic treatment with the Mdk-Ab significantly improved bone healing in osteoporotic mice by increasing bone formation in the fracture callus. On the molecular level, we demonstrated that the OVX-induced reduction of the osteoanabolic beta-catenin signaling in the bony callus was abolished by Mdk-Ab treatment. Furthermore, the injection of the Mdk-Ab increased trabecular bone mass in the skeleton of the osteoporotic mice. These results implicate that antagonizing Mdk may be useful for the therapy of osteoporosis and osteoporotic fracture-healing complications.
Insights
Inhibiting midkine (Mdk) with an antibody improved bone healing in osteoporotic mice. This therapy enhanced bone formation and increased bone mass, offering potential for treating osteoporosis and related fracture complications.
Area of Science:
- Skeletal Biology
- Bone Metabolism
- Regenerative Medicine
Background:
- Midkine (Mdk) negatively regulates osteoblast activity and bone formation.
- Mdk deficiency protects against ovariectomy (OVX)-induced bone loss, suggesting a role in postmenopausal osteoporosis.
- Mdk impairs bone regeneration during fracture healing.
Purpose of the Study:
- To investigate if Mdk inhibition using an Mdk-antibody (Mdk-Ab) improves compromised bone healing in osteoporotic OVX-mice.
- To assess the therapeutic potential of Mdk antagonism for osteoporosis and associated fracture complications.
Main Methods:
- Utilized a standardized femur osteotomy model in OVX-mice.
- Administered systemic Mdk-Ab treatment.
- Measured Mdk serum levels and analyzed bone formation in the fracture callus.
- Assessed beta-catenin signaling pathway activity.
- Evaluated trabecular bone mass.
Main Results:
- Mdk serum levels increased significantly after fracture, with a greater elevation in OVX-mice.
- Mdk-Ab treatment significantly improved bone healing in osteoporotic mice by enhancing callus bone formation.
- Mdk-Ab treatment reversed the OVX-induced reduction in beta-catenin signaling in the bony callus.
- Mdk-Ab injection increased overall trabecular bone mass in OVX-mice.
Conclusions:
- Antagonizing Mdk with an Mdk-Ab is a promising therapeutic strategy for improving bone healing in osteoporosis.
- Mdk inhibition can restore osteoanabolic signaling and increase bone mass in osteoporotic conditions.
- Targeting Mdk may effectively treat osteoporosis and complications of osteoporotic fracture healing.
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