Relative expression of mRNA for P2Y2 receptors (A), P2Y6 receptors (B) and the ratio P2Y6/P2Y2 (C) in naïve murine aortic SMCs (SMC aorta), in a primary culture of aortic SMCs (cultured SMC) and in J774 macrophages (J774). The expression of P2Y6 receptors decreased upon cultivation of SMCs, whereas J774 macrophages displayed a relatively high expression. ΔCT= CTβ-actin – CT P2Y2 or 6. Results show mean and SEM, n= 5; *P < 0.05, **P < 0.01, anova, Bonferroni post hoc test. SMC, smooth muscle cell.