Aim To investigate the mitogenic effect of urotensin II on cells. Methods In cultured rat aorta smooth muscle cells (VSMC), tracheal smooth muscle cells (TSMC), cardiac fibroblasts (CF) and glomerular mesagial cells (GMC), UⅡ was used to stimulate these cells and levels of 3 H-TdR incorporation were used to evaluate the speed of DNA synthesis. Results UⅡ increased levels in concentration-dependent manner of 3 H-TdR incorporation of these cells significantly. But in different c...