Role of Neutrophils in Arginine-asymmetric Dimethylarginine Pathway Subsequent to Endotoxemia


Nurten T., Nihal S., Gonca O., Ozgur A., Halil Y., Filiz B., ...Daha Fazla

INTEGRATIVE PHYSIOLOGY, cilt.1173, 2009 (SCI İndekslerine Giren Dergi) identifier identifier identifier

Özet

There is a striking correlation between nitric oxide (NO) production and myeloper-oxidase (MPO) enzyme activity accession in various tissues after endotoxemia. Both arginine-NO and arginine-asymmetric dimethylarginine (ADMA) pathways have been recognized to play critical roles during infection and inflammation. We investigated whether there is a link between MPO-mediated nitrating pathway and arginine-ADMA pathway after endotoxemia in liver. All experiments were performed in two groups (control and endotoxemia) of 10 guinea pigs. In this study, 6 h after the administration of endotoxin at a dose of 4 mg/kg, MPO activity and ADMA, L-arginine, and 3-nitrotyrosine (3-NT, a stable product of peroxynitrite formation) levels were measured. Measurement of ADMA and L-arginine were accomplished by HPLC with fluorescent detector. 3-NT was quantified by HPLC with electrochemical detector. MPO activity was determined by spectrophotometric method. After administration of endotoxin, ADMA and L-arginine levels decreased, but 3-NT levels and MPO activity increased significantly. In conclusion, there is an inverse relationship between MPO-mediated tyrosine nitration and arginine-ADMA pathway in liver after endotoxemia.