Fig. 1. The effect of udenafil on toll-like receptor 4 (TLR4) mRNA expression in the hypothalamus. Udenafil (500 µg) was dissolved in 10 µL saline. Udenafil or an equal volume of saline were injected into the lateral ventricle in rats. Data are expressed as mean±standard error of 3 experimental rats. ^*p<0.05 vs. control.