• Department of Gastrointestinal and Gland Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China;
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Objective  To explore the protein expressions of matrix metalloproteinase-9 (MMP-9) and tissue inhibitor of metalloproteinase-1 (TIMP-1), and to investigate their relationships between their serum concentration before operation and the infiltration and metastasis of thyroid carcinoma.
Methods  The protein expressions of MMP-9 and TIMP-1 in 32 cases of thyroid carcinomas, 23 cases of adjacent tissues and 30 cases of benign hyperplastic lesions were measured by using immunohistochemistry. The preoperative serum concentrations of MMP-9 and TIMP-1 in 21 cases of thyroid carcinomas and 19 cases of benign hyperplastic lesions were determined by enzyme-linked immunosorbent assay.
Results  The positive expression rates of MMP-9 and TIMP-1 in tumor tissues were significantly higher (75.0%,56.3%)than those in adjacent tissues and benign hyperplastic lesions (30.4%, 21.7%; 26.7%, 23.3%)  P<0.05. There were correlations between the expressions of MMP-9 and TIMP-1 and the local infiltrative degrees, lymph node metastasis and TNM stage (P<0.05). There was a negative correlation between the expression of MMP-9 and the expression of TIMP-1 (r=-0.509, P=0.003). The concentration of MMP-9 in serum of thyroid carcinoma patients was (122.60±36.20) ng/ml, whereas TIMP-1 was (59.44±38.65)  ng/ml, both of which were significantly higher compared to those of benign group (P<0.05).  In addition, there was a positive correlation between the expressions of MMP-9/TIMP-1 in the carcinoma tissues and their concentrations in serum (P<0.05).
Conclusion  To detection the expressions of MMP-9 and TIMP-1 in the lesion and their concentrations in the serum may not only contribute to the differential diagnosis of thyroid tumors, but may also help to predict the prognosis of the carcinoma.

Citation: ZHANG Jianjun,LIU Zhiming. Expression of Matrix Metalloproteinase-9 and Tissue Inhibitor of Metalloproteinase-1 in Thyroid Carcinoma Tissue and Their Concentrations in Serum. CHINESE JOURNAL OF BASES AND CLINICS IN GENERAL SURGERY, 2007, 14(4): 437-441. doi: Copy