title: Both neuropeptide Y knockdown and Y1 receptor inhibition modulate CART-mediated appetite control.
abstract: Amphetamine (AMPH)-induced appetite suppression has been attributed to its inhibition of neuropeptide Y (NPY)-containing neurons in the hypothalamus. This study examined whether hypothalamic cocaine- and amphetamine-regulated transcript (CART)-containing neurons and NPY Y1 receptor (Y1R) were involved in the action of AMPH. Rats were treated daily with AMPH for four days, and changes in feeding behavior and expression levels of NPY, CART, and POMC were assessed and compared. The results showed that both feeding behavior and NPY expression decreased during AMPH treatment, with the biggest reduction occurring on Day 2. By contrast, the expression of CART and melanocortin 3 receptor (MC3R), a member of the POMC neurotransmission, increased with the maximum response on Day 2, directly opposite to the NPY expression results. The intracerebroventricular infusion of NPY antisense or Y1R inhibitor both modulated AMPH-induced anorexia and the expression levels of MC3R and CART. The results suggest that in the hypothalamus both POMC- and CART-containing neurons participate in regulating NPY-mediated appetite control during AMPH treatment. These results may advance the knowledge of molecular mechanism of anorectic drugs.
authors.affiliation: Department of Food Science, Central Taiwan University of Science and Technology, Taichung City 406, Taiwan, ROC.
authors.forename: Shu-Chen
authors.initials: SC
authors.lastname: Chu
authors.affiliation: Institute of Biochemistry and Biotechnology, Chung Shan Medical University and Chung Shan Medical University Hospital, Taichung City 40201, Taiwan, ROC.
authors.forename: Pei-Ni
authors.initials: PN
authors.lastname: Chen
authors.affiliation: School of Psychology, Chung Shan Medical University and Chung Shan Medical University Hospital, Taichung City 40201, Taiwan, ROC.
authors.forename: Ying-Jui
authors.initials: YJ
authors.lastname: Ho
authors.affiliation: Department of Physiology, Chung Shan Medical University and Chung Shan Medical University Hospital, Taichung City 40201, Taiwan, ROC.
authors.forename: Ching-Han
authors.initials: CH
authors.lastname: Yu
authors.affiliation: Institute of Biochemistry and Biotechnology, Chung Shan Medical University and Chung Shan Medical University Hospital, Taichung City 40201, Taiwan, ROC.
authors.forename: Yih-Shou
authors.initials: YS
authors.lastname: Hsieh
authors.affiliation: Department of Physiology, Chung Shan Medical University and Chung Shan Medical University Hospital, Taichung City 40201, Taiwan, ROC. Electronic address: dykuo@csmu.edu.tw.
authors.forename: Dong-Yih
authors.initials: DY
authors.lastname: Kuo
mesh_terms: D000661:Amphetamine / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D001067:Appetite Depressants / Q000008:administration & dosage / Q000494:pharmacology*; D001069:Appetite Regulation / Q000187:drug effects / Q000502:physiology*; D007031:Hypothalamus / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D009478:Neuropeptide Y / Q000378:metabolism*; D016376:Oligonucleotides, Antisense / Q000378:metabolism; D010446:Peptide Fragments / Q000378:metabolism; D011333:Pro-Opiomelanocortin / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D017476:Receptors, Neuropeptide Y / Q000378:metabolism*; D000098882:Cocaine- and Amphetamine-Regulated Transcript Protein
chemical_list: D001067:Appetite Depressants; D009419:Nerve Tissue Proteins; D009478:Neuropeptide Y; D016376:Oligonucleotides, Antisense; D010446:Peptide Fragments; D017476:Receptors, Neuropeptide Y; D000098882:Cocaine- and Amphetamine-Regulated Transcript Protein; C428723:cocaine- and amphetamine-regulated transcript protein (55-102); C097212:neuropeptide Y-Y1 receptor; D011333:Pro-Opiomelanocortin; D000661:Amphetamine
keywords: Amphetamine; Appetite; Brain; CART; NPY antisense; POMC; Y1R