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- W2000322240 abstract "Effects of endothelin-1 on the contraction and cytosolic Ca2+ concentrations ([Ca2+]i) of the mouse right ventricle were investigated. Endothelin-1 (1–300 nM) elicited a negative inotropic effect in a concentration-dependent manner. The endothelin-1-induced negative inotropy was antagonized by a selective endothelin ETA receptor antagonist, BQ-123 (cyclo [Asp-Pro-Val-Leu-Trp-]; 3, 10 μM). Endothelin-1 reduced the peak amplitudes of both the [Ca2+]i transient and contraction without changing inward Ca2+ current. The relationship between peak amplitude of [Ca2+]i and peak force generated by changing the extracellular Ca2+ concentration ([Ca2+]o) was not affected by endothelin-1. In addition, the trajectory of the [Ca2+]i-contraction phase plane diagram obtained at 2 mM [Ca2+]o in the absence of endothelin-1 was superimposable on that obtained at 4 mM [Ca2+]o in the presence of endothelin-1 (300 nM). Endothelin-1 (300 nM) translocated protein kinase C from cytosol to membrane, suggesting activation of protein kinase C. Further, a selective protein kinase C inhibitor, bisindolylmaleimide I (10 μM), inhibited the endothelin-1-induced negative inotropy. These results suggest that endothelin-1 elicits negative inotropy by reducing the amplitude of the [Ca2+]i transient without changing inward Ca2+ current through the activation of the endothelin ETA receptor followed by protein kinase C activation in the mouse right ventricle." @default.
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- W2000322240 date "2000-05-01" @default.
- W2000322240 modified "2023-10-15" @default.
- W2000322240 title "Negative inotropic effect of endothelin-1 in the mouse right ventricle" @default.
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- W2000322240 doi "https://doi.org/10.1016/s0014-2999(00)00218-1" @default.
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