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One of the physiological mechanisms by which the heart adapts to a rise in blood pressure is by augmenting myocyte stretch-mediated intracellular calcium, with a subsequent increase in contractility. This slow force response was first described over a century ago and has long been considered compensatory, but its underlying mechanisms and link to chronic adaptations remain uncertain. Because levels of the matricellular protein thrombospondin-4 (TSP4) rapidly rise in hypertension and are elevated in cardiac stress overload and heart failure, we hypothesized that TSP4 is involved in this adaptive mechanism.

Thrombospondin-4 Is Required for Stretch-Mediated Contractility Augmentation in Cardiac Muscle