Protein levels of HCN1 and its auxiliary subunit TRIP8b (exon4) are downregulated in BLA tissue from NPY-treated rats. A, Amount of HCN1 protein in the BLA (mean ± SEM) was decreased significantly at 4W, but not 2W, after repeated intra-BLA NPY treatment (2-way ANOVA; treatment: F(1,35) = 7.22, p = 0.011; time: F(1,35) = 0.25, p = 0.62; interaction: F(1,35) = 1.64, p = 0.21). B, Conversely, the protein product of TRIP8b exon 4 (mean ± SEM) was decreased significantly at 2W (2-way ANOVA; treatment: F(1,36) = 4.23, p = 0.047; time: F(1,36) = 0.85, p = 0.36; interaction: F(1,36) = 1.13, p = 0.30). Protein levels were normalized to β-actin as an endogenous control and data are presented relative to W2 Veh. Numbers of animals studied are indicated in each bar. *p < 0.05, Bonferroni's multiple-comparisons test.