Effect of heterologous bone marrow mononuclear cell transplantation on midpalatal expansion in rats

Guo,Jie; Wang,Lue; Xu,Haihua; Che,Xiaoxia

doi:10.3892/etm.2015.2253

Effect of heterologous bone marrow mononuclear cell transplantation on midpalatal expansion in rats

Authors:
- Jie Guo
- Lue Wang
- Haihua Xu
- Xiaoxia Che
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Affiliations: Department of Orthodontics, School of Stomatology, Shandong University, Jinan, Shandong 250012, P.R. China, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China, Department of Orthodontics, School of Stomatology, Capital Medical University, Beijing 100050, P.R. China
Published online on: February 3, 2015 https://doi.org/10.3892/etm.2015.2253
Pages: 1235-1240

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Abstract

The aim of this study was to explore whether bone marrow mononuclear cell (BMMC) transplantation is able to accelerate the bone remodeling induced by midpalatal expansion in rats. A total of 48 male Sprague‑Dawley rats (mean weight, 208.36±7.32 g) were divided into control and midpalatal expansion with or without BMMC transplantation groups. Histological and morphological changes were observed in each group. The osteogenic activities and differential potentials of the transplanted BMMCs labeled with bromodeoxyuridine in the midpalatal bone tissue were assessed by osteocalcin expression. The receptor activator of nuclear factor κB ligand (RANKL)/osteoprotegerin (OPG) ratio was determined by reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) to reflect the equilibrium between bone resorption and formation. The results demonstrated that the width of the maxillary dental arch increased distinctly within 2 weeks of midpalatal expansion with BMMC transplantation. The morphology of the midpalatal suture in this group changed significantly; the cartilage was completely replaced by fibrous‑like tissue expressing osteocalcin. The palatal bone was reorganized from a cancellous form into a mature compact structure after an additional 2‑week relapse period. Immunostaining results indicated that the heterologous transplanted BMMCs survived and differentiated into osteoblasts during the remodeling induced by midpalatal expansion. The RANKL/OPG expression ratio significantly decreased after 2 weeks of midpalatal expansion with BMMC transplantation due to the inhibition of RANKL expression. Heterologous BMMC transplantation appears to accelerate the midpalatal bone remodeling induced by expansion of the rats through increasing the number of osteoprogenitor cells and regulating the RANKL‑OPG signaling pathway.

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