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Glycyrrhizin down-regulates expression of tissue inhibitor of metalloproteinases-1
Qiao-Xia Wang, Jun Cheng, Jiang Guo, Wen-Fan Li, Hong-Shan Wei
Qiao-Xia Wang, Lanzhou University, Lanzhou 730000, Gansu Province, China
Jun Cheng, Jiang Guo, Hong-Shan Wei, Institute of Infectious Diseases, Ditan Hospital, Beijing 100011, China
Wen-Fan Li, Department of Gastroenterology, The People's Hospital of Gansu Province, Lanzhou 730000, Gansu Province, China
Supported by: National Natural Science Foundation, No. C03011402, No. C30070689; Returned Scholarship of General Logistics Department of Chinese PLA, No. 98H038; the Key Technology Research and Development Program of Chinese PLA during the 9th Five-Year Plan Period, No. 98D063; the Key Technology Research and Development Program of Chinese PLA for Distinguished Young Scholars during the 10th Five-Year Plan Period, No. 01Q138; and the Scientific Research Program of Chinese PLA during the 10th Five-Year Plan Period, No. 01MB135.
Correspondence to: Dr. Jun Cheng, Anwai Street, Dongcheng District, Institute of Infectious Diseases, 13 Ditan Park, Ditan Hospital, Beijing 100011, China. cj@genetherapy.com.cn
Received: July 5, 2005 Revised: July 7, 2005 Accepted: July 8, 2005 Published online: September 28, 2005
AIM: To investigate the regulatory effect of glycyrrhizin on the tissue inhibitor of metalloproteinases-1(TIMP-1) expression and to explore its anti-fibrosis mechanism.
METHODS: The TIMP-1 promoter was amplified by polymerase chain reaction(PCR), and the product was named TIMP-1P. The TIMP-1P was cloned into pGEM-Teasy vector to obtain pGEM-Teasy-TIMP-1P, and then the product and pCAT3-basic vector were digested by NheI and XhoI to construct pCAT3-TIMP-1P. Then pCAT3-TIMP-1P was transfected into HepG2 cells and the cells were treated with 0.1 mmol glycyrrhizin for 48 h. The HepG2 cells transfected with pCAT3-basic were used as negative controls. The expression level of chloramphenicol acetyltransferase(CAT) in HepG2 cells was detected by enzyme-linked immunoassay (ELISA).
RESULTS: The expressive vector pCAT3-TIMP-1P was constructed and confirmed by restriction enzyme digestion and sequencing. The optical density(OD) of the cells transfected with pCAT3-TIMP-1P was significantly higher than that with pCAT3-basic(2.329±0.685 vs 0.004±0.002, F =26.075, P < 0.05). After treatment with glycyrrhizin, the expression of CAT in the HepG2 cells transfected with pCAT3-TIMP-1P was notably decreased as compared with that in the same cells without glycyrrhizin treatment(OD: 0.268±0.009 vs 0.490±0.153, F =35.775, P < 0.05).
CONCLUSION: Glycyrrhizin can down-regulate the activity of TIMP-1 gene promoter as well as inhibit the expression of TIMP-1.
Key Words: Glycyrrhizin; Tissue inhibitor of metalloproteinases-1; Anti-fibrosis
Citation: Wang QX, Cheng J, Guo J, Li WF, Wei HS. Glycyrrhizin down-regulates expression of tissue inhibitor of metalloproteinases-1. Shijie Huaren Xiaohua Zazhi 2005; 13(18): 2183-2187
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