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Journal Article
Research Support, Non-U.S. Gov't
Improvement of Bone Healing by Neutralization of microRNA-335-5p, but not by Neutralization of microRNA-92A in Bone Marrow Mononuclear Cells Transplanted into a Large Femur Defect of the Rat.
Tissue Engineering. Part A 2019 January
Transplanted bone marrow mononuclear cells (BMC) support the healing of large bone defects. Neutralization of microRNA (MiR) that negatively affects key processes of the reparative response in BMC might help to further improve the beneficial effect of transplanted BMC in bone healing. Hence, the aim of this study was to evaluate if the neutralization of MiR-92A (vascularization) and MiR-335-5p (osteogenic differentiation) in BMC using specific antiMiRs leads to a further improvement of the BMC-supported therapy of large bone defects. BMC transiently transfected with antiMiR- 92A, antiMiR-335, antiMiR-92A, and antiMiR-355 or control antiMiR were seeded on β-TCP (beta-tricalcium phosphate) and placed in a femoral large bone defect (5 mm) in Sprague-Dawley rats. Ultimate load as well as osseous integration of the β-TCP-scaffolds were significantly improved in the antiMiR-335 group compared to the control group after 8 weeks, whereas neutralization of antiMiR-92A lead to an improvement of early vascularization after 1 week, but not to enhanced bone healing after 8 weeks. We demonstrated that the targeted inhibition of MiRs in transplanted BMC is a new approach that enhances BMC-supported bone healing.
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