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Figure 7 (Upper panel) Representative Western immunoblots showing the expression of cyclooxygenase (COX-2) protein in the membranous fraction in the ischemic/reperfused region. (Lower panels) Densitometic analysis of COX-2 protein signals in the membranous fraction in the ischemic/reperfused region (anterior left ventricular [LV] wall) (left) and in the nonischemic region (posterior LV wall) (right). In all samples, the densitometric measurements of COX-2 immunoreactivity were expressed as a percentage of the average value measured in the corresponding LV wall of control rabbits. The two comparisons performed in each panel were adjusted by the Bonferroni correction. Data are means ± SEM. ASA = acetylsalicylic acid (aspirin); PC = preconditioning.