title: Occurrence of the toxin dehydroabietic acid in Salmonella typhimurium.
abstract: Many strains of Salmonella typhimurium studied in our lab demonstrated marked differences in the pathogenicity for guinea pig, chicken and Hela cells. As a result, a pathogenic strain of S. typhimurium, strain 9SR2, was evaluated for lipophilic components that may be associated with virulence using gas chromatography/mass spectrometry. The hydroxylated fatty acids 2-hydroxytetradecanoic acid (2-OH-14:0) and 3-hydroxytetradecanoic acid (3-OH-14:0) often present in lipid A, a potent endotoxin, were observed as their methyl esters. The cyclic fatty acids methylene-hexadecanoic acid (C17delta) and methyleneoctadecanoic acid (C19delta) also were detected. The nephrotoxic and neurotoxic diterpenoid resin acid, dehydroabietic acid, was observed for the first time from S. typhimurium in both the total lipid and diglyceride fractions and determined as its methyl ester at m/z 314.2246. Due to its previously established toxicity, dehydroabietic acid may be a factor associated with virulence of S. typhimurium.
authors.affiliation: Southern Plains Agricultural Research Center, Agricultural Research Service, US Department of Agriculture, College Station, TX, 77845-4998, USA. rcbeier@FFSRU.tamu.edu
authors.forename: R C
authors.initials: RC
authors.lastname: Beier
authors.forename: B A
authors.initials: BA
authors.lastname: Oyofo
authors.forename: G E
authors.initials: GE
authors.lastname: Spates
mesh_terms: D045784:Abietanes; D000818:Animals; D002645:Chickens; D004224:Diterpenes / Q000378:metabolism* / Q000633:toxicity*; D005227:Fatty Acids / Q000302:isolation & purification / Q000633:toxicity; D005612:Freeze Drying; D008401:Gas Chromatography-Mass Spectrometry; D006168:Guinea Pigs; D006367:HeLa Cells; D006801:Humans; D006868:Hydrolysis; D008055:Lipids / Q000302:isolation & purification; D012486:Salmonella typhimurium / Q000737:chemistry / Q000378:metabolism* / Q000472:pathogenicity; D014774:Virulence
chemical_list: D045784:Abietanes; D004224:Diterpenes; D005227:Fatty Acids; D008055:Lipids; C013913:dehydroabietic acid