Fractionation of protein components of the human synovial fluid was carried out with paper and disc electrophoresis, and isoelectric focusing. The mean ranges of total protein content of synovial fluid obtained in the thirty patients suffering from nonspecific and traumatic synovitis, degenerative osteoarthritis or rheumatoid arthritis were 3.8 to 4.6g/dl. There was no significant difference between each from of arthritis. The pattern of protein fractionation of synovial fluid by paper electrophoresis was similar to that of serum protein. On disc electrophoresis, 20 fractions were identified in synovial fluid and the main fraction was albumin. Isoelectric focusing of the human serum with Ampholine carrier ampholyte in thin layer polyacrylamide gel revealed 27 protein fractions and five isoenzymes of amylase and two of them were the main fractions. In the synovial fluid 22 protein fractions and two isoenzymes of amylase, which had the same isoelectric points as the main fractions of serum, were noted. It is suggested that the isoamylases in the synovial fluid are a dialysate of plasma enzymes.
Arthritis, Rheumatoid/metabolism ; Human ; Osteoarthritis/metabolism ; Proteins/metabolism* ; Synovial Fluid/metabolism* ; Synovitis/metabolism

BACKGROUNDFunctional magnetic resonance is a non-invasive method that can examine brain activity and has been widely used in various fields including jaw movement and pain processing. Temporomandibular disorder (TMD) is one of the most frequent facial pain problems. The objective of this study was to investigate the brain activities using functional magnetic resonance imaging (fMRI) during unilateral maximal voluntary clenching tasks in the TMD synovitis patients with biting pain.

METHODSFourteen TMD synovitis patients with unilateral biting pain and 14 controls were included in the study. Contralateral biting pain was defined as right molar clenching causing left temporomandibular joint (TMJ) pain. Ipsilateral biting pain was defined as right molar clenching causing right TMJ pain. Symptom Check List-90 (SCL-90) was administered to the patients and controls. Independent sample t-test was used to compare the SCL-90 subscales between the two groups. Unilateral clenching tasks were performed by the patients and controls. Imaging data were analyzed using SPM99.

RESULTSPatients were divided into contralateral TMD biting pain group (n = 8) and ipsilateral TMD biting pain group (n = 6). The SCL-90 subscales were significantly different between the two groups for somatization, depression, anxiety, phobic anxiety, and paranoid ideation. Group analysis of the controls demonstrated brain activations in the inferior frontal gyrus, precentral gyrus, middle frontal gyrus, superior temporal gyrus, and insular. The areas of activation were different between right and left clenching task. In TMJ synovitis patients with contralateral or ipsilateral biting pain, the group analysis showed activations in the inferior frontal gyrus, superior temporal gyrus, medium frontal gyrus, precentral gyrus, and anterior cingulate cortex.

CONCLUSIONSThe inferior frontal gyrus and precentral gyrus play essential roles during the unilateral clenching task. Activation of anterior cingulate cortex in the synovitis patients with biting pain was associated with higher levels of psychological distress.

Adolescent ; Adult ; Brain ; metabolism ; physiology ; Facial Pain ; metabolism ; physiopathology ; Female ; Humans ; Magnetic Resonance Imaging ; methods ; Male ; Middle Aged ; Synovitis ; pathology ; Temporomandibular Joint ; pathology ; Young Adult

BACKGROUNDThere are few reports of a biological role for glycosyltransferases in the infiltration of osteoarthritic synovitis. The aim of this research was to investigate the expression and cellular location of β-1,4-galactosyltransferase I (β-1,4-GalT-I) in a surgically-induced rat model of knee osteoarthritis (OA), and explore the role of β-1,4-GalT-I in the pathogenesis of OA.

METHODSMale Sprague-Dawley rats were randomly divided into three groups: OA group, sham group and normal group. The model of OA was established in the right knees of rats by anterior cruciate ligament transaction (ACLT) with partial medial meniscectomy. Fibroblast-like synoviocytes (FLSs) obtained from normal rat synovial tissue were cultured. The expression of β-1,4-GalT-I mRNA in the synovial tissue, articular cartilage and FLSs treated with tumor necrosis factor-α (TNF-α) were assayed by real-time PCR. Western-blotting and immunohistochemisty were used to observe the expression of β-1,4-GalT-I at the protein level. Double immunofluorescent staining was used to define the location of the β-1,4-GalT-I with macrophage-like synoviocytes, FLSs, neutrophils, and TNF-α in the OA synovium. The alteration of TNF-α in FLSs which were treated with lipopolysaccharide (LPS) and β-1,4-GalT-I-Ab were detected by enzyme-linked immunosorbent assay (ELISA).

RESULTSThe mRNA and protein expression of β-1,4-GalT-I increased in synovial tissue of the OA group compared with the normal and sham groups at two and four weeks after the surgery, however, no significant difference appeared in the articular cartilage. Immunohistochemistry also indicated that the β-1,4-GalT-I expression in OA synovium at four weeks after surgery increased sharply compared with the control group. β-1,4-GalT-I co-localized with macrophage-like synoviocytes, FLSs, neutrophils and TNF-α in rat OA synovitis. Moreover, in vitro β-1,4-GalT-I mRNA in FLSs was affected in a dose- and time-dependent manner in response to TNF-α stimulation. ELISA revealed that the expression of TNF-α was attenuated in FLSs in vitro when treated with anti β-1,4-GalT-I antibody.

CONCLUSIONβ-1,4-GalT-I may play an important role in the inflammation process of rat OA synovial tissue which would provide the foundation for further researching into the concrete mechanism of β-1,4-GalT-I in OA synovitis.

Animals ; Blotting, Western ; Cells, Cultured ; Enzyme-Linked Immunosorbent Assay ; Galactosyltransferases ; genetics ; metabolism ; Immunohistochemistry ; Knee Joint ; enzymology ; pathology ; surgery ; Male ; Osteoarthritis, Knee ; enzymology ; genetics ; pathology ; Polymerase Chain Reaction ; Rats ; Rats, Sprague-Dawley ; Synovial Membrane ; enzymology ; Synovitis ; enzymology ; etiology