Aims: We assessed whether hypoosmotic swelling of cardiac myocytes activates volume-sensitive Cl− current (ICl,swell) via the angiotensin II (AngII)-reactive oxygen species (ROS) signalling cascade. The AngII-ROS pathway previously was shown to elicit ICl,swell upon mechanical stretch of β1D integrin. Integrin stretch and osmotic swelling are, however, distinct stimuli. For example, blocking Src kinases stimulates swelling-induced but inhibits stretch-induced ICl,swell.