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Article Open Access

Rapamycin-induced autophagy activity promotes bone fracture healing in rats

Corrigendum in: /10.3892/etm.2021.9749
  • Authors:
    • Ge Yang
    • Xunhong Duan
    • Dasheng Lin
    • Ten Li
    • Deqing Luo
    • Lei Wang
    • Kejian Lian
  • View Affiliations / Copyright

    Affiliations: Department of Orthopedic Surgery, The Affiliated Southeast Hospital of Xiamen University, Orthopedic Center of People's Liberation Army, Zhangzhou, Fujian 363000, P.R. China
    Copyright: © Yang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1327-1333
    |
    Published online on: July 27, 2015
       https://doi.org/10.3892/etm.2015.2660
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Abstract

Autophagy is a crucial mediating process for normal bone cell function and metabolism in physiology or pathology. Rapamycin has been demonstrated to induce the autophagy pathway by inhibiting the mammalian target of rapamycin (mTOR) pathway. However, the contribution of autophagy in orthopedic diseases is rarely reported. The aim of the present study was to evaluate the capacity of pharmacologically induced autophagy to modify disease function in a rat model of bone fracture. A femur fracture model was established via surgery in adult male Sprague‑Dawley rats. Rapamycin (n=63 rats) or dimethyl sulfoxide (DMSO) vehicle control (n=63 rats) was administered intraperitoneally for 2, 4 and 6 weeks, and 21 randomly selected rats were sacrificed in each group at each time point. X‑ray micro‑computed tomography and hematoxylin and eosin staining were used to evaluate the extent of fracture healing in each group. The effects of rapamycin on autophagy, mTOR signaling and the expression levels of vascular endothelial growth factor (VEGF) and proliferating cell nuclear antigen (PCNA) were analyzed using immunohistochemistry, immunofluorescence staining and western blot analysis. Rapamycin affected the mTOR signaling pathway in rats following fracture, as indicated by the inhibition of the phosphorylation of ribosomal protein S6, a target of mTOR, and activation of microtubule‑associated protein 2 light chain 3, a key marker of autophagy. Histomorphometry and image examination indicated that the number of osteoblasts in each section was significantly (P<0.01) increased in the rapamycin group compared with the control group, and this was associated with a significant (P<0.05) increase in mineralized callus fraction. Furthermore, rapamycin treatment increased the expression levels of VEGF and PCNA in the rat callus tissue. These results suggest that rapamycin may serve a beneficial function in fracture healing, and that the underlying mechanism may involve the activation of autophagy.
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Copy and paste a formatted citation
Spandidos Publications style
Yang G, Duan X, Lin D, Li T, Luo D, Wang L and Lian K: Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749. Exp Ther Med 10: 1327-1333, 2015.
APA
Yang, G., Duan, X., Lin, D., Li, T., Luo, D., Wang, L., & Lian, K. (2015). Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749. Experimental and Therapeutic Medicine, 10, 1327-1333. https://doi.org/10.3892/etm.2015.2660
MLA
Yang, G., Duan, X., Lin, D., Li, T., Luo, D., Wang, L., Lian, K."Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749". Experimental and Therapeutic Medicine 10.4 (2015): 1327-1333.
Chicago
Yang, G., Duan, X., Lin, D., Li, T., Luo, D., Wang, L., Lian, K."Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749". Experimental and Therapeutic Medicine 10, no. 4 (2015): 1327-1333. https://doi.org/10.3892/etm.2015.2660
Copy and paste a formatted citation
x
Spandidos Publications style
Yang G, Duan X, Lin D, Li T, Luo D, Wang L and Lian K: Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749. Exp Ther Med 10: 1327-1333, 2015.
APA
Yang, G., Duan, X., Lin, D., Li, T., Luo, D., Wang, L., & Lian, K. (2015). Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749. Experimental and Therapeutic Medicine, 10, 1327-1333. https://doi.org/10.3892/etm.2015.2660
MLA
Yang, G., Duan, X., Lin, D., Li, T., Luo, D., Wang, L., Lian, K."Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749". Experimental and Therapeutic Medicine 10.4 (2015): 1327-1333.
Chicago
Yang, G., Duan, X., Lin, D., Li, T., Luo, D., Wang, L., Lian, K."Rapamycin-induced autophagy activity promotes bone fracture healing in rats Corrigendum in /10.3892/etm.2021.9749". Experimental and Therapeutic Medicine 10, no. 4 (2015): 1327-1333. https://doi.org/10.3892/etm.2015.2660
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