cAMP impairs FPR-induced mitochondrial activation. PMNs were loaded with Rhod2 and incubated for 20 min with or without 1 µM cAMP-AM, and fMLP-induced mitochondrial Ca2+ uptake was recorded by fluorescence microscopy (DMI6000 B; Leica; objective: 100× oil, NA 1.30; DFC365 FX camera; Leica). Frames were taken every 1 s for 30 s.