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Detection and preliminary characterization of matrix metalloproteinase activity in temporomandibular joint lavage
G Zardeneta1, S B Milam, T Lee
1Department of Oral and Maxillofacial Surgery, The University of Texas Health Science Center at San Antonio 78284, USA.
Abstract:
In this study, lavage fluid was fractionated from the superior joint space in patients with temporomandibular joint (TMJ) dysfunction. A hide powder azure protease assay was used to assess protease activity in lavage fluid. No correlation between a patient's pain and the level of protease activity was demonstrated. Latent as well as active proteases were detected in the sample lavage fluid. Latent matrix metalloproteinases (MMPs) were activated using trypsin. Stromelysin-1 was detected in an active form in lavage fluid by immunozymography. The presence of high molecular weight species with protease activity was also demonstrated. This study validates the presence of stromelysin-1 as well as other MMPs in TMJ lavage fluid and proposes a mechanism for their physiologic activation.
Insights
Researchers found active matrix metalloproteinases (MMPs), including stromelysin-1, in temporomandibular joint (TMJ) dysfunction lavage fluid. Pain levels did not correlate with protease activity, suggesting other activation mechanisms are at play.
Area of Science:
- Biochemistry
- Oral and Maxillofacial Surgery
- Biomedical Engineering
Background:
- Temporomandibular joint (TMJ) dysfunction involves complex biochemical processes.
- Protease activity in synovial fluid is implicated in joint degradation.
Purpose of the Study:
- To investigate protease activity in TMJ lavage fluid.
- To identify specific proteases and their activation states in TMJ dysfunction.
Main Methods:
- Fractionation of lavage fluid from the superior joint space of TMJ dysfunction patients.
- Protease activity assessment using a hide powder azure assay.
- Activation of latent matrix metalloproteinases (MMPs) with trypsin.
- Detection of active stromelysin-1 via immunozymography.
Main Results:
- No correlation was found between patient pain levels and protease activity.
- Both latent and active proteases were detected in the lavage fluid.
- Active stromelysin-1 and other MMPs were identified.
- High molecular weight species with protease activity were present.
Conclusions:
- This study confirms the presence of stromelysin-1 and other MMPs in TMJ lavage fluid.
- A potential mechanism for the physiological activation of these proteases is proposed.
- Further research into MMP activation pathways in TMJ dysfunction is warranted.