Figure 4.
Synthesis and actions of ET-1 in mesangial cells. A large variety of substances stimulate ET-1 production, including ET-1 itself. Vasodilators tend to inhibit mesangial cell ET-1 synthesis. ET-1 likely acts in an autocrine manner. In general, ETA activation leads to cell contraction, while ETB activation causes relaxation. Please see text for definitions of abbreviations.