title: High leptin level is accompanied with decreased long leptin receptor transcript in histamine deficient transgenic mice.
abstract: Leptin is a multifunctional cytokine and hormone that primarily acts in the hypothalamus and plays a key role in regulation of food intake and energy expenditure. Leptin acts through its receptor (OBR), the product of db gene that activates the Jak/STAT pathway predominantly. To exert its functions, leptin interacts with histamine as well. Histamine is a downstream effector of leptin as its release, metabolism is enhanced by leptin and hypothalamic histamine reduces food intake. In a bi-directional regulatory loop histamine also influences leptin concentration by inhibiting its expression. In this study we demonstrate that histamine deficiency elevates serum leptin level and decreases full-length leptin receptor isoform with a slight increase of the short one and results in mild late onset obesity. These observation can help to elucidate further the bi-lateral interaction of leptin and histamine, and therefore provide useful data to understand the pathomechanism of obesity.
authors.affiliation: Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, H-1089 Budapest, Hungary.
authors.forename: Krisztina
authors.initials: K
authors.lastname: Hegyi
authors.forename: Kristóf A
authors.initials: KA
authors.lastname: Fülöp
authors.forename: Krisztina J
authors.initials: KJ
authors.lastname: Kovács
authors.forename: András
authors.initials: A
authors.lastname: Falus
authors.forename: Sára
authors.initials: S
authors.lastname: Tóth
mesh_terms: D000818:Animals; D006632:Histamine / Q000378:metabolism*; D006640:Histidine Decarboxylase / Q000235:genetics* / Q000378:metabolism; D020738:Leptin / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D008954:Models, Biological; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000235:genetics* / Q000378:metabolism; D054411:Receptors, Leptin; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D020738:Leptin; D020033:Protein Isoforms; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; D054411:Receptors, Leptin; C515447:leptin receptor, mouse; D006632:Histamine; D006640:Histidine Decarboxylase