Nitric oxide cycle activity in rat biceps femoris muscle under conditions of bacterial lipopolysaccharide influence, experimental metabolic syndrome and their combination

Abstract

There is evidence that long-term organism stimulation with bacterial lipopolysaccharides (LPS), which promotes the secretion of pro-inflammatory cytokines and nitric oxide, may play an important role in metabolic syndrome (MetS) development. Changes in NO production under conditions of MetS have different directions and depend on a specific organ. The purpose of this work was to study the production of nitric oxide and its metabolites in the biceps femoris muscle of rats under conditions of lipopolysaccharide stimulation of the organism, metabolic syndrome and their combination. The study was conducted for 60 days on 24 male Wistar rats divided into control, MetS, LPS and LPS+MetS groups. MetS was reproduced by adding 20% fructose solution to food, LPS stimulation was carried out by intraperitoneal injection of S. typhi LPS. It was demonstrated that stimulation of the rat organism with LPS under conditions of experimental metabolic syndrome increased the production of nitric oxide by L-arginine-dependent pathway, but limited metabolic syndrome-induced increase in nitric oxide production by L-arginine-independent pathway, reduced the concentration of S-nitrosothiols, while increasing the concentration of peroxynitrites and nitrites in the biceps femoris muscle of rats. Keywords: bacterial lipopolysaccharide, biceps femoris, metabolic syndrome, nitric oxide, reactive nitrogen species