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- W2099505344 abstract "The objective of this study was to determine whether elevated circulating levels of endothelin (ET)-1 are capable of mediating left ventricular (LV) mast cell degranulation and thereby induce matrix metalloproteinase (MMP) activation. After the administration of 20 pg/ml ET-1 to blood-perfused isolated rat hearts, LV tissue was analyzed for signs of mast cell degranulation and MMP activation. Relative to control, ET-1 produced extensive mast cell degranulation as well as a significant increase in myocardial water content (78.8 ± 1.5% vs. 74.2 ± 2.2%, P < 0.01), a marked 107% increase in MMP-2 activity ( P < 0.05), and a substantial decrease in collagen volume fraction (0.69 ± 0.09% vs. 0.99 ± 0.04%, P < 0.001). Although the myocardial edema would be expected to increase ventricular stiffness, compliance was not altered, and moderate ventricular dilatation was observed (end-diastolic volume at end-diastolic pressure of 0 mmHg of 330.2 ± 22.1 vs. 298.9 ± 17.4 μl in ET-1 treated vs. control, respectively, P = 0.07). Additionally, pretreatment with the mast cell stabilizer nedocromil prevented ET-1-induced changes in MMP-2 activity, myocardial water content, collagen volume fraction, and end-diastolic volume. These findings demonstrate that ET-1 is a potent cardiac mast cell secretogogue and further indicate that ET-1-mediated mast cell degranulation is a potential mechanism responsible for myocardial remodeling." @default.
- W2099505344 created "2016-06-24" @default.
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- W2099505344 date "2004-11-01" @default.
- W2099505344 modified "2023-09-24" @default.
- W2099505344 title "Endothelin-1 mediates cardiac mast cell degranulation, matrix metalloproteinase activation, and myocardial remodeling in rats" @default.
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- W2099505344 doi "https://doi.org/10.1152/ajpheart.00048.2004" @default.
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