Medline ® Abstract for Reference 59
of 'Actions of angiotensin II on the heart'
Autocrine release of angiotensin II mediates stretch-induced hypertrophy of cardiac myocytes in vitro.
Sadoshima J, Xu Y, Slayter HS, Izumo S
Hypertrophy is a fundamental adaptive process employed by postmitotic cardiac and skeletal muscle in response to mechanical load. How muscle cells convert mechanical stimuli into growth signals has been a long-standing question. Using an in vitro model of load (stretch)-induced cardiac hypertrophy, we demonstrate that mechanical stretch causes release of angiotensin II (Ang II) from cardiac myocytes and that Ang II acts as an initial mediator of the stretch-induced hypertrophic response. The results not only provide direct evidence for the autocrine mechanism in load-induced growth of cardiac muscle cells, but also define the pathophysiological role of the local (cardiac) renin-angiotensin system.
Molecular Medicine Division, Beth Israel Hospital, Boston, Massachusetts.