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This study examined the possible role of protein kinase A (PKA) and cAMP response element-binding protein (CREB) signaling in this anorectic effect, and the results showed that both PKA and CREB mRNA levels in hypothalamus were increased following AMPH treatment, which was relevant to a reduction of NPY mRNA level. To determine whether PKA or CREB was involved in the anorectic response, intracerebroventricular infusions of antisense oligonucleotide (or missense control) were performed 60 min before daily AMPH treatment in conscious rats, and results showed that either PKA or CREB knockdown could block AMPH-induced anorexia as well as restore NPY mRNA level, indicating the respective involvement of PKA and CREB signaling in the regulation of NPY gene expression. 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