Expressions of matrix metalloproteinases and their inhibitors in steroid-induced necrosis of rat femoral head / 西安交通大学学报(医学版)

Objective To study the protein expression levels of matrix metalloproteinases (MMPs)and their inhibitors in bone tissues of rat femoral head and to explore the relationship between necrosis of femoral head and glucocorticoid.Methods Twenty healthy adult SD rats were randomly divided into glucocorticoid group and control group,with 10 rats in each.Glucocorticoid group was treated with intramuscular injection of hydrocortisone twice a week.The control group received normal saline of the same volume.Four weeks later,bone tissues of left femoral head were collected from each group of rats for HE determination of femoral head necrosis.The expressions of matrix metalloproteinase-1 (MMP-1 ), matrix metalloproteinase-2 (MMP-2 ), tissue inhibitor of matrix metalloproteinase-1 (TIMP-1 ),and tissue inhibitor of matrix metalloproteinase-2 (TIMP-2 )at mRNA and protein levels were detected by RT-PCR and Western blot techniques,respectively.Results The expressions of MMP-1 and MMP-2 at mRNA and protein levels were higher in glucocorticoid group than those in the control group. However,TIMP-1 and TIMP-2 gene and protein expression levels were lower in glucocorticoid group (all P<0.05). Conclusion The expressions of MMPs in bone tissues of rat femoral head in early necrosis were increased,but their inhibitors had decreased expressions. We can draw the conclusion that glucocorticoid-induced necrosis of femoral head may be related to its regulation of the expression levels of MMPs and their related inhibitors.

The effect of periodontal flap surgery on Matrix metalloproteinases (MMPs) and Tissue inhibitors of matrix metalloproteinase-1 (TIMP-1) levels in gingival crevicular fluids of periodontitis patients / 대한치주과학회지

No abstract available.

Expression of the Tissue Inhibitor of Matrix-Metalloproteinase (TIMP-2) in Cervical Carcinoma / 대한산부인과학회잡지

OBJECTIVE: The present study was conducted to evaluate the tissue inhibitor of matrix-metalloproteinase (TIMP-2), which leads to tumor proliferation, invasion and metastasis and which can be used as a prognostic factor for cervical carcinoma, and to correlate TIMP-2 with recurrence in cervical carcinoma. METHODS: Thirty-three cases of cervical carcinoma and ten control cervices were analysed for expression of TIMP-2 by immunohistochemical staining. Results were analysed for possible correlation with prognostic factors. RESULTS: Lymph node metastasis, lymphovascular invasion, and recurrence groups showed a lower expression tendency of TIMP-2 in tumor cells (0.67 vs 0.88, 0.77 vs 0.93, 0.78 vs 0.91) (p>0.05). However, there was no statistical significance in the correlation of TIMP-2 expression with tumor variables. On the other hand, in stromal cells, deep invasion (>or=5 mm), squamous cell carcinoma groups showed a higher expression tendency of TIMP-2 (0.80 vs 0.67, 0.74 vs 0.40) (p>0.05) but, there was no statistical significance. However, recurrence group showed a significantly lower expression of TIMP-2 in stromal cells (0.33 vs 0.83) (p<0.05). CONCLUSION: In spite of no statistically significant correlation in tumor cells, recurrence group showed a significantly lower expression of TIMP-2 in stromal cells. Therefor there was an inverse correlation between expression of TIMP-2 in stromal cell and recurrence. These results indicate that expression of TIMP-2 in stromal cells is closely correlated with the recurrence of cervical carcinoma.