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Association of matrix metalloproteinase expression and left ventricular function in idiopathic dilated cardiomyopathy
O Yokoseki1, Y Yazaki, J Suzuki
1First Department of Internal Medicine, Shinshu University, School of Medicine, Matsumoto, Japan.
Abstract:
Myocardial remodeling is an important predictor for the development of dilated cardiomyopathy (DCM). Matrix metalloproteinases (MMPs) are the family of proteins responsible for extracellular remodeling, and tissue inhibitors of metalloproteinases (TIMPs) tightly control their activity. In the present study, the expression of MMP-2, MMP-9, TIMP-1 and TIMP-2 was determined by immunohistochemistry in right ventricular endomyocardial biopsy samples from 16 patients with idiopathic DCM, and its clinical significance was evaluated by comparison with parameters of cardiac function. To obtain a semi-quantitative assessment of MMP and TIMP expression, the average number of positive cells per high power field was counted. The left ventricular ejection fraction (LVEF) significantly correlated with the expression of both MMP-2 (r=-0.68) and TIMP-2 (r=-0.58). Patients were classified into 2 groups according to the degree of MMP-2 expression: strongly positive and weakly positive. LVEF, left ventricular (LV) end-diastolic pressure, right ventricular end-diastolic pressure, pulmonary capillary wedge pressure and the plasma norepinephrine level were significantly greater in the strongly positive group (p<0.05). In conclusion, the expression of MMPs and TIMPs in the cardiac matrix of patients with idiopathic DCM is closely associated with myocardial remodeling and subsequent deterioration of LV performance. These findings suggest new therapeutic targets for patients with idiopathic DCM.
Insights
Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) are linked to myocardial remodeling in dilated cardiomyopathy (DCM). Their expression correlates with cardiac function decline, suggesting potential therapeutic targets.
Area of Science:
- Cardiology
- Biochemistry
- Pathology
Background:
- Myocardial remodeling is a key factor in the progression of dilated cardiomyopathy (DCM).
- Matrix metalloproteinases (MMPs) and their inhibitors, tissue inhibitors of metalloproteinases (TIMPs), regulate extracellular matrix remodeling.
- Understanding MMP and TIMP roles in DCM is crucial for identifying therapeutic strategies.
Purpose of the Study:
- To investigate the expression of MMP-2, MMP-9, TIMP-1, and TIMP-2 in patients with idiopathic DCM.
- To evaluate the clinical significance of MMP and TIMP expression in relation to cardiac function parameters.
Main Methods:
- Immunohistochemistry was used to assess MMP-2, MMP-9, TIMP-1, and TIMP-2 expression in endomyocardial biopsy samples from 16 idiopathic DCM patients.
- Semi-quantitative analysis involved counting positive cells per high power field.
- Expression levels were correlated with cardiac function parameters like left ventricular ejection fraction (LVEF).
Main Results:
- Left ventricular ejection fraction (LVEF) showed significant negative correlations with MMP-2 (r=-0.68) and TIMP-2 (r=-0.58) expression.
- Patients with strong MMP-2 expression exhibited significantly higher LVEF, left ventricular end-diastolic pressure, right ventricular end-diastolic pressure, pulmonary capillary wedge pressure, and plasma norepinephrine levels.
- These findings indicate a link between MMP/TIMP expression and disease severity.
Conclusions:
- MMP and TIMP expression in the cardiac matrix of idiopathic DCM patients is closely associated with myocardial remodeling.
- Deterioration of left ventricular performance is linked to altered MMP and TIMP levels.
- These proteins represent potential therapeutic targets for managing idiopathic DCM.