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Updated: Oct 31, 2025
Detection of Functional Matrix Metalloproteinases by Zymography
Published on: November 8, 2010
Quantification of matrix metalloproteinases MMP-8 and MMP-9 in gingival overgrowth
Jennifer Orozco-Páez1, Erika Rodríguez-Cavallo2, Antonio Díaz-Caballero3
1Analytical Chemistry and Biomedicine Group, University of Cartagena, Cartagena, Colombia.
Background:
Matrix metalloproteinases (MMPs) are proteolytic enzymes involved in extracellular matrix remodeling of all body tissues, including oral tissues such as gingival tissue. Expression levels of MMPs are widely studied as important biomarkers for explaining the biochemical mechanisms and evolution of many oral diseases.
Objective:
Demonstrate the sensitivity, reproducibility, repeatability, and robustness of the dot blot assay for the relative quantification of MMP-8 and MMP-9 expression levels in patients with GO associated with orthodontic treatment.
Methods:
A validated dot blot assay was used to compare the relative expression levels of MMP-8 and MMP-9 in gingival samples. Methodological variability, reproducibility, sensitivity and robustness were determined with the use of control samples from healthy donors (G1). Next, expression levels were measured in gingival tissue from patients with mild and moderate gingival overgrowth associated with orthodontic treatment (G3 and G4) and patients without gingival overgrowth but with a history of using orthodontic appliances (G2).
Results:
Dot blot assay demonstrated that MMP-8 and MMP-9 expression levels were higher in patients with gingival overgrowth and distinguished those with moderate clinical grade (G4) from those with mild overgrowth (G3). In addition, patients with a history of orthodontic treatment showed similar expression levels to the control group two years after removing orthodontic appliances.
Conclusions:
With the assay used, we were able to detect differences in MMP-8 and MMP-9 expression in patients with different levels of severity of gingival overgrowth. Dot blot could be used to measure MMPs during the onset and progression of gingival overgrowth.
Insights
The dot blot assay effectively quantifies matrix metalloproteinases (MMPs), revealing higher MMP-8 and MMP-9 levels in gingival overgrowth linked to orthodontics. This method aids in monitoring gingival health during treatment.
Area of Science:
- Biochemistry
- Oral Biology
- Biomarker Discovery
Background:
- Matrix metalloproteinases (MMPs) are key enzymes in extracellular matrix remodeling, crucial in oral tissues.
- MMP expression levels serve as vital biomarkers for understanding oral disease mechanisms and progression.
- Gingival overgrowth (GO) is a common complication associated with orthodontic treatment.
Purpose of the Study:
- To validate the dot blot assay for quantifying matrix metalloproteinases (MMPs) -8 and -9 expression.
- To assess the assay's sensitivity, reproducibility, repeatability, and robustness.
- To investigate MMP-8 and MMP-9 levels in gingival overgrowth (GO) related to orthodontic treatment.
Main Methods:
- A validated dot blot assay was employed to compare relative MMP-8 and MMP-9 expression in gingival samples.
- Assay performance was evaluated using control samples from healthy donors.
- Expression levels were analyzed in patients with varying degrees of GO associated with orthodontic treatment and those with a history of appliance use.
Main Results:
- The dot blot assay successfully detected higher MMP-8 and MMP-9 expression levels in patients with gingival overgrowth.
- The assay differentiated between mild (G3) and moderate (G4) clinical grades of gingival overgrowth based on MMP levels.
- Individuals with a history of orthodontic treatment exhibited normal MMP expression levels two years post-appliance removal.
Conclusions:
- The dot blot assay is a reliable tool for detecting differential MMP-8 and MMP-9 expression in gingival overgrowth.
- This assay can effectively measure MMPs during the onset and progression of gingival overgrowth.
- The findings support the use of dot blot assays for monitoring gingival health in orthodontic patients.
