Figure 4. Myocardial metabolic substrate remodeling induced increase of ¹⁸F‐FDG uptake.

A, Expression of GLUT4 and CPT1 was determined by western blot. β‐actin was a load control. B, Data summary of GLUT4 (left) and CPT1 (right) were expressed as broken‐line graphs of means with 95% confidence of the independent experiments. *P<0.05, **P<0.01. C, Electron microscopy images of the irradiated myocardium of each group, scale bar = 2 μm. Con indicates control; CPT1, carnitine acyltransferase 1; ¹⁸F‐FDG, ¹⁸F‐fludeoxyglucose; GLUT4, glucose transporter 4; and Ir, irradiated.