title: Reduced adipose tissue mass and hypoleptinemia in iNOS deficient mice: effect of LPS on plasma leptin and adiponectin concentrations.
abstract: The aim of this study was to evaluate the impact of the lack of inducible NO synthase (iNOS) on body weight and adipose tissue mass as well as on plasma leptin and adiponectin in basal conditions and 6 h after lipopolysaccharide (LPS) administration in mice. Body weight was not different among male, six-week-old wild-type (WT) and iNOS-/- animals. However, the amount of epididymal white adipose tissue (EWAT) in iNOS-/- mice was significantly reduced (P<0.05). Circulating leptin and leptin mRNA in EWAT were decreased in iNOS-/- mice (P<0.05 and P<0.01, respectively). Plasma adiponectin and adiponectin mRNA were unchanged. LPS administration increased plasma leptin in both genotypes (P<0.05). Neither genotype nor treatment changed plasma adiponectin. In summary, iNOS-/- mice exhibited normal body weight but reduced adipose mass accompanied by hypoleptinemia. Leptin responsiveness to LPS in iNOS-/- mutants is preserved, showing that the LPS-induced rise in leptin is independent of the presence of functional iNOS. In addition, iNOS deficiency or LPS does not influence expression and circulating levels of adiponectin.
authors.affiliation: Metabolic Research Laboratory, Clínica Universitaria de Navarra, Edificio CIFA, University of Navarra, Irunlarrea 1, 31008 Pamplona, Spain. jagomez@unav.es
authors.forename: Javier
authors.initials: J
authors.lastname: Gómez-Ambrosi
authors.forename: Sara
authors.initials: S
authors.lastname: Becerril
authors.forename: Paula
authors.initials: P
authors.lastname: Oroz
authors.forename: Santiago
authors.initials: S
authors.lastname: Zabalza
authors.forename: Amaia
authors.initials: A
authors.lastname: Rodríguez
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Muruzábal
authors.forename: Marta
authors.initials: M
authors.lastname: Archanco
authors.forename: María J
authors.initials: MJ
authors.lastname: Gil
authors.forename: María A
authors.initials: MA
authors.lastname: Burrell
authors.forename: Gema
authors.initials: G
authors.lastname: Frühbeck
mesh_terms: D052242:Adiponectin; D000273:Adipose Tissue / Q000378:metabolism*; D000818:Animals; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood*; D020738:Leptin / Q000097:blood / Q000235:genetics*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D019001:Nitric Oxide Synthase / Q000172:deficiency*; D052247:Nitric Oxide Synthase Type II; D013997:Time Factors
chemical_list: D052242:Adiponectin; D036341:Intercellular Signaling Peptides and Proteins; D020738:Leptin; D008070:Lipopolysaccharides; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse