title: Antagonistic targeting of the histamine H3 receptor decreases caloric intake in higher mammalian species.
abstract: The main purpose of this study was to examine the effects of a selective histamine H(3) receptor antagonist, NNC 38-1202, on caloric intake in pigs and in rhesus monkeys. The compound was given intragastrically (5 or 15 mg/kg), to normal pigs (n=7) and subcutaneously (1 or 0.1mg/kg) to obese rhesus monkeys (n=9). The energy intake recorded following administration of vehicle to the same animals served as control for the effect of the compound. In addition, rhesus monkey and pig histamine H(3) receptors were cloned from hypothalamic tissues and expressed in mammalian cell lines. The in vitro antagonist potencies of NNC 38-1202 at the H(3) receptors were determined using a functional GTPgammaS binding assay. Porcine and human H(3) receptors were found to have 93.3% identity at the amino acid level and the close homology between the monkey and human H(3) receptors (98.4% identity) was confirmed. The antagonist potencies of NNC 38-1202 at the porcine, monkey and human histamine H(3) receptors were high as evidenced by K(i)-values being clearly below 20 nM, whereas the K(i)-value on the rat H(3) receptor was significantly higher (56+/-6.0 nM). NNC 38-1202, given to pigs in a dose of 15 mg/kg, produced a significant (p<0.05) reduction (55%) of calorie intake compared with vehicle alone, (132.6+/-10.0 kcal/kgday versus 59.7+/-10.2 kcal/kgday). In rhesus monkeys administration of 0.1 and 1mg/kg decreased (p<0.05) average calorie intakes by 40 and 75%, respectively. In conclusion, the present study demonstrates that antagonistic targeting of the histamine H(3) receptor decreases caloric intake in higher mammalian species.
authors.affiliation: Department of Diabetes Pharmacology, Novo Nordisk A/S, Novo Nordisk Park, 2760 Måløv, Denmark. kmal@novonordisk.com
authors.forename: Kjell
authors.initials: K
authors.lastname: Malmlöf
authors.forename: Sven
authors.initials: S
authors.lastname: Hastrup
authors.forename: Birgitte Schellerup
authors.initials: BS
authors.lastname: Wulff
authors.forename: Barbara C
authors.initials: BC
authors.lastname: Hansen
authors.forename: Bernd
authors.initials: B
authors.lastname: Peschke
authors.forename: Claus Bekker
authors.initials: CB
authors.lastname: Jeppesen
authors.forename: Rolf
authors.initials: R
authors.lastname: Hohlweg
authors.forename: Karin
authors.initials: K
authors.lastname: Rimvall
mesh_terms: D000818:Animals; D002149:Energy Intake / Q000187:drug effects* / Q000502:physiology; D006633:Histamine Antagonists / Q000494:pharmacology*; D006801:Humans; D008253:Macaca mulatta; D051381:Rats; D018100:Receptors, Histamine H3 / Q000502:physiology*; D034421:Sus scrofa
chemical_list: D006633:Histamine Antagonists; D018100:Receptors, Histamine H3