Lei Hu

Sichuan University, Hua-yang, Sichuan, China

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Publications (2)1.46 Total impact

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    ABSTRACT: The aim of this study was to investigate the effect of intra-articular sodium hyaluronate (SH) injections on the main components of plasminogen activator (PA) system in the synovial fluid of temporomandibular joint (TMJ) osteoarthritis (OA). Forty patients diagnosed with TMJ OA and 20 healthy control subjects were included in this study. Synovial fluid was collected in the OA group and the healthy group at baseline. The OA patients were randomly divided into 2 groups (20 patients for each group): One group received 5 injections of SH, and the other received 5 injections of physiologic saline solution in the upper joint space at weekly intervals. Synovial fluid was collected before and after treatment. Urokinase-type PA (uPA), soluble uPA receptor (suPAR) and PA inhibitor 1 (PAI-1) levels in synovial fluid were quantified by enzyme-linked immunosorbent assay. The OA patients had significantly higher uPA activity and levels of uPA (median 80.01 ng/L), suPAR (median 7.54 ng/L), and PAI-1 (median 54.9 ng/mL) than the healthy control subjects (median 20.47 ng/L uPA, 2.34 ng/L suPAR, and 19.9 ng/mL PAI-1; (P < .05). The uPA activity and levels of uPA, suPAR, and PAI-1 were significantly decreased after SH injections in TMJs of OA patients (P < .05), and there was no difference after saline injection. Visual analog pain score reduction correlated with changes in uPA and uPAR levels as well as uPA activity. The effects of SH on PA system provide new insight into a possible underlying mechanism by which SH alleviates pain of patients with TMJ OA.
    No preview · Article · Feb 2010 · Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
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    ABSTRACT: To investigate the level of urokinase-type plasminogen activator (uPA) and urokinase-type plasminogen activator receptor (uPAR) in synovial fluid of patients with temporomandibular disorders and to analyze their relation with temporomandibular disorders (TMD). Synovial fluid was obtained from 64 sides of 56 TMD patients and from 16 sides of 10 asymptomatic healthy volunteers (control). The concentrations of uPA and uPAR in the synovial fluid were measured by ELISA. Forty-eight sides of TMD were divided into 3 groups: arthrosis, structure disorder and osteoarthrosis, each including 16 sides. The levels of uPA and uPAR were significantly higher in the synovial fluid of TMD patients than that in the control group (P < 0.05), and the level of uPA and uPAR in osteoarthrosis group was significantly higher than that in arthrosis and structure disorder group (P < 0.05). However, there was no difference in expression of uPA and uPAR between arthrosis and structure disorder groups (P > 0.05). uPA and uPAR in the synovial fluid may play a role in the pathogenesis of TMD, and the level of uPA and uPAR in synovial fluid of TMD could be used as a biochemical markers to reflect pathological degree of TMD.
    No preview · Article · Apr 2008 · Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology