The role of myofibroblasts in the development of osteoradionecrosis in a newly established rabbit model

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• 作者：Chunlin Zong^a ; ^b ; ¹ ; Bolei Cai^a ; ^b ; ¹ ; Xinxin Wen^c ; ¹ ; Syed Alam^d ; Yuanli Chen^a ; ^b ; Yuxuan Guo^a ; ^b ; Yanpu Liu^a ; ^b ; ; Lei Tian^a ; ^b ; ^{tianleison@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Animal model ; Human equivalent radiation ; Myofibroblasts ; Osteoradionecrosis of jaws ; Radiation-induced fibrosis
• 刊名：Journal of Cranio-Maxillofacial Surgery
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：44
• 期：6
• 页码：725-733
• 全文大小：2641 K

文摘

This study aimed to establish a proper animal model of osteoradionecrosis of jaws (ORNJ) and to observe preliminarily the characteristics of myofibroblasts, the key effector cell of fibrosis, in ORNJ. Rabbit mandibles were irradiated at three different doses based on a human equivalent radiation schedule, and examined by gross manifestation, single-photon emission computed tomography (SPECT), micro–computed tomography, sequential fluorochrome labeling, and histology. Immunohistochemistry staining of α-SMA was applied to detect the existence of myofibroblasts. The exposed necrotic bone, which is the main indication of ORNJ, started to be observed at all rabbits at 9 Gy. With the radiation dose increasing, the microarchitecture of the irradiated mandibles was more destroyed, the metabolism and mineralization of the irradiated mandibles diminished, the osteocytes number decreased, and more mature bones were substituted by fibrosis in the irradiated mandibles. In addition, as the radiation dose increased, the myofibroblast number increased and collected around the separated sequestrum, which indicated that myofibroblasts might relate to the pathogenesis of ORNJ. In summary, a clinically translational ORNJ model was successfully established in our study, and the role of myofibroblasts in the pathogenesis of ORNJ is described for the first time.