Abstract
We evaluated the effect of low-intensity pulsed ultrasound (LIPUS) on MMP-13 and MAPKs expression in rabbit knee osteoarthritis (OA). For this purpose, 18 New Zealand white rabbits were randomly and equally divided into O + L, O – L, and SO groups. In O + L group, animals underwent right back leg ACLT operation and LIPUS radiation. In O − L group, animals underwent ACLT but no LIPUS treatment. In SO (control) group, animals underwent sham operation without LIPUS. After 6 weeks, we assessed the pathologic changes in the articular surface of femoral condyle and compared using Mankin scores. Also, expression of type-II collagen, MMP-13, ERK1/2, p38, and JNK was measured by Western blot. Compared with controls, Mankin scores were higher in O + L (P < 0.05)/O − L (P < 0.01) groups. Compared with O + L group, score was higher in O − L group (P < 0.05). Compared with controls, type-II collagen expression was less in O + L/O − L groups, with more significant decrease in O − L group (P < 0.05). Contrarily, expression of MMP-13, p-ERK1/2, and p-p38 was enhanced in O + L/O − L groups as compared with controls, with more significant increase in O − L group (P < 0.01). Compared with O + L group, expression was higher in O − L group (P < 0.05). We, therefore, concluded that LIPUS application promoted cartilage repair in OA through the downregulation of MMP-13, ERK1/2, and p38.
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Acknowledgments
We thank Dr. Huang Wenbin and Mr. Wang Jinsong from Department of Pathology, Nanjing First Hospital affiliated to Nanjing Medical University for generous help with tissue production and scoring. We also thank: (1) National Key Program for Developing Basic Research (Grant # 2007CB936104); (2) National High Technology Research and Development Program of China (Grant # 2007AA021905); and (3) Science & Technology Support Project of Jiangsu Province (Grant # BE2010697) for financial support.
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Li, X., Li, J., Cheng, K. et al. Effect of Low-Intensity Pulsed Ultrasound on MMP-13 and MAPKs Signaling Pathway in Rabbit Knee Osteoarthritis. Cell Biochem Biophys 61, 427–434 (2011). https://doi.org/10.1007/s12013-011-9206-4
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DOI: https://doi.org/10.1007/s12013-011-9206-4