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Hepatic Metabolism of Sulfur Amino Acids During Septic Shock  

Kang, Keon-Wook (College of Pharmacy Chosun University)
Kim, Sang-Kyum (College of Pharmacy and Research Center for Transgenic Cloned Pigs, Chungnam National University)
Publication Information
YAKHAK HOEJI / v.51, no.6, 2007 , pp. 383-388 More about this Journal
Abstract
It has been reported that sulfur-containing intermediates or products in the transsulfuration pathway including S-adenosylmethionine, 5'-methylthioadenosine, glutathione and taurine can prevent liver injury mediated by inflammation response induced by lipopolysaccharide (LPS) treatment. The present study examines the modulation of hepatic metabolism of sulfur amino acid in a model of acute sepsis induced by LPS treatment (5 mg/kg, iv). Serum TNF-alpha and hepatotoxic parameters were significantly increased in rats treated with LPS, indicating that LPS results in sepsis at the doses used in this study. LPS also induced oxidative stress determined by increases in malondialdehyde levels and decreases in total oxy-radical scavenging capacities. Hepatic methionine and glutathione concentrations were decreased, but S-adenosylho-mocysteine, cystathionine, cysteine, hypotaurine and taurine concentrations were increased. Hepatic protein expression of methionine adenosyltransferase, cystathionine beta-synthase and cysteine dioxygenase were induced, but gamma-glutamylcysteine ligase catalytic subunit levels were decreased. The results show that sepsis activates transsulfuration pathway from methionine to cysteine, suggesting an increased requirement for methionine during sepsis.
Keywords
sepsis; lipopolysaccharide; sulfur amino acid; hepatic metabolism; transsulfuration;
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