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Updated: Jan 24, 2026
Detection of Functional Matrix Metalloproteinases by Zymography
Published on: November 8, 2010
[Matrix metalloproteinases-1, -13 and their tissue inhibitor-1 in endocrine ophthalmopathy]
E S Taskina1, S V Kharintseva1
1Chita State Medical Academy.
Abstract:
Effective regeneration of damaged soft orbital tissues in Graves' ophthalmopathy (GO) requires coordinated remodeling of the extracellular matrix. Matrix metalloproteinases (MMPs) play an important role in the synthesis and degradation homeostasis of extracellular matrix components in various physiological and pathological conditions. Their proteolytic activity is inhibited by tissue inhibitors of metalloproteinases (TIMP). The biochemical processes taking place in extraocular muscles and retrobulbar tissue fibrogenesis in GO are not fully understood. Aims - to assess some biochemical mechanisms of extraocular muscles and retrobulbar tissue fibrogenesis in GO patients.
Material And Methods:
The study included 65 people (130 eyes) at the age of 43 (35-50) years. Three groups of subjects were formed: 32 patients with a moderate GO severity (clinical group), 18 patients with autoimmune thyroid pathology without GO (comparison group), and 15 healthy persons (control). The diagnosis was based on clinical, laboratory, and instrumental data. A comprehensive ophthalmologic examination and blood sampling for determination of MMP-1, -13, TIMP-1, sulfated glycosaminoglycans (sGAG) and antibodies to thyroid-stimulating hormone receptor (TSHRAbs) were conducted. The data were statistically processed using the program Statistica 10.0.
Results:
An elevated level of MMP-13, observed in all GO patients (p<0.05). For the active phase of GOP, the comparison with the control group showed a 3.5-fold increase in MMP-13 (p<0.001) and 1.17-fold rise in TIMP-1 (p>0.05). Pulse glucocorticoid therapy reduced MMP-13 by 48.6% (p<0.001), TIMP-1 by 2.7% (p<0.001), and TSHRAbs - by 93% (p<0.001) compared with active GO, but these indicators were higher than the reference limits of control (p>0.05). In inactive GO, despite increased MMP-13, TIMP-1 decreased to the reference values (p=0.533). There were no significant differences in MMP-1 in groups of subjects (p=0.865).
Conclusions:
We have found imbalance between MMP-13 and TIMP-1 production in different activity phases of GO. Active GO is characterized by an increase in serum MMP-13 and TIMP-1. Dysregulation of intercellular matrix remodeling, possibly, underlies the development of extraocular muscles and retrobulbar tissue fibrosis in GO.
Insights
Graves' ophthalmopathy (GO) involves an imbalance in matrix metalloproteinase-13 (MMP-13) and tissue inhibitor of metalloproteinases-1 (TIMP-1), contributing to fibrosis. Treatment can normalize these markers, though levels may remain elevated compared to controls.
Area of Science:
- Ophthalmology
- Endocrinology
- Biochemistry
Background:
- Graves' ophthalmopathy (GO) involves soft orbital tissue damage and fibrosis, driven by extracellular matrix remodeling.
- Matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) regulate extracellular matrix homeostasis.
- The specific biochemical mechanisms of fibrogenesis in GO's extraocular muscles and retrobulbar tissues are not fully understood.
Purpose of the Study:
- To investigate the biochemical mechanisms underlying extraocular muscle and retrobulbar tissue fibrogenesis in patients with Graves' ophthalmopathy.
- To assess the levels of MMP-1, MMP-13, TIMP-1, sulfated glycosaminoglycans (sGAG), and TSHRAbs in different phases of GO.
Main Methods:
- A study involving 65 participants (32 GO patients, 18 autoimmune thyroid patients without GO, 15 healthy controls).
- Comprehensive ophthalmologic examinations and blood sampling for biochemical marker analysis.
- Statistical analysis using Statistica 10.0 software.
Main Results:
- Elevated MMP-13 levels were observed in all GO patients, with a significant increase in active GO compared to controls.
- Pulse glucocorticoid therapy reduced MMP-13, TIMP-1, and TSHRAbs in active GO patients.
- In inactive GO, MMP-13 remained elevated while TIMP-1 returned to reference values; MMP-1 levels did not differ significantly across groups.
Conclusions:
- An imbalance between MMP-13 and TIMP-1 production characterizes different activity phases of Graves' ophthalmopathy.
- Active GO shows increased serum MMP-13 and TIMP-1, suggesting dysregulated matrix remodeling contributes to fibrosis.
- Therapeutic interventions can modulate these markers, but further research is needed to fully understand their role in GO pathogenesis.
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