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Asian Pacific journal of tropical medicine

Effect of low intensity pulsed ultrasound on expression of TIMP-2 in serum and expression of mmp-13 in articular cartilage of rabbits with knee osteoarthritis.


PMID 26706677

Abstract

To study the effect of low intensity pulsed ultrasound (LIPUS) on the expression of tissue inhibitor of metalloproteinase-2 (TIMP-2) in the serum and expression of matrix metallopeptidase 13 (MMP-13) in the articular cartilage cells of rabbits with knee osteoarthritis (OA). Inner patellar ligament defect method was used to establish the model of knee OA. Four weeks after the modeling, the arterial blood was drawn from the ear of each rabbit, while ELISA was employed to detect the expression of TIMP-2 in the serum. The chondrocytes were separated from animals in each group and then cultured inxa0vitro. All rabbits were divided into control group, OA model group and OAxa0+xa0LIPUS group. Cells in the control and OA groups were not treated, while cells in the OAxa0+xa0LIPUS group were treated with LIPUS (40xa0mW/cm(2), 1 time/day). Cells were collected 7xa0d later and the RNA and total protein were extracted respectively. Real-time PCR and Western blotting were employed to analyze the expression of MMP-13 in chondrocytes at the mRNA and protein level, respectively. The success rate of establishment of OA model was 83%. The results of ELISA showed that the content of TIMP-2 in the serum of animals with OA was 22.3%, lower than the one in the control group (Pxa0