Pericytes constrict blood vessels after myocardial ischemia.

No-reflow phenomenon is defined as the reduced blood flow after myocardial ischemia. If prolonged it leads to profound damages in the myocardium. The lack of a detailed knowledge about the cells mediating no-reflow restricts the design of effective therapies. Recently, O'Farrell et al. (2017) by using state-of-the-art technologies, including high-resolution confocal imaging in combination with myocardial ischemia/reperfusion mouse model, reveal that pericytes contribute to the no-reflow phenomenon post-ischemia in the heart. Strikingly, intravenous adenosine increased vascular diameter at pericyte site after cardiac ischemia. This study provides a novel therapeutic target to inhibit no-reflow phenomenon after myocardial ischemia.