title: Involvement of lipid peroxidation-derived aldehyde-protein adducts in autoimmunity mediated by trichloroethene.
abstract: Lipid peroxidation, a major contributor to cellular damage, is also implicated in the pathogenesis of autoimmune diseases (AD). The focus of this study was to elucidate the role of lipid peroxidation-derived aldehydes in autoimmunity induced and/or exacerbated by chemical exposure. Previous studies showed that trichloroethene (TCE) is capable of inducing/accelerating autoimmunity. To test whether TCE-induced lipid peroxidation might be involved in the induction/exacerbation of autoimmune responses, groups of autoimmune-prone female MRL +/+ mice were treated with TCE (10 mmol/kg, i.p., every 4th day) for 6 or 12 wk. Significant increases of the formation of malondialdehyde (MDA)- and 4-hydroxynonenal (HNE)-protein adducts were found in the livers of TCE-treated mice at both 6 and 12 wk, but the response was greater at 12 wk. Further characterization of these adducts in liver microsomes showed increased formation of MDA-protein adducts with molecular masses of 86, 65, 56, 44, and 32 kD, and of HNE-protein adducts with molecular masses of 87, 79, 46, and 17 kD in TCE-treated mice. In addition, significant induction of anti-MDA- and anti-HNE-protein adduct-specific antibodies was observed in the sera of TCE-treated mice, and showed a pattern similar to MDA- or HNE-protein adducts. The increases in anti-MDA- and anti-HNE-protein adduct antibodies were associated with significant elevation in serum anti-nuclear-, anti-ssDNA- and anti-dsDNA-antibodies at 6 wk and, to a greater extent, at 12 wk. These studies suggest that TCE-induced lipid peroxidation is associated with induction/exacerbation of autoimmune response in MRL+/+ mice, and thus may play an important role in disease pathogenesis. Further interventional studies are needed to establish a causal relationship between lipid peroxidation and TCE-induced autoimmune response.
authors.affiliation: Department of Pathology, University of Texas Medical Branch, Galveston, Texas 77555-0609, USA.
authors.forename: Gangduo
authors.initials: G
authors.lastname: Wang
authors.forename: G A S
authors.initials: GA
authors.lastname: Ansari
authors.forename: M Firoze
authors.initials: MF
authors.lastname: Khan
mesh_terms: D000447:Aldehydes / Q000276:immunology / Q000378:metabolism; D000818:Animals; D001323:Autoantibodies / Q000097:blood / Q000276:immunology*; D001327:Autoimmune Diseases / Q000139:chemically induced / Q000276:immunology*; D004195:Disease Models, Animal; D005260:Female; D015227:Lipid Peroxidation / Q000276:immunology*; D008315:Malondialdehyde / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008862:Microsomes, Liver / Q000276:immunology*; D014241:Trichloroethylene / Q000276:immunology* / Q000633:toxicity
chemical_list: D000447:Aldehydes; D001323:Autoantibodies; C462359:tert-4-hydroxy-2-nonenal; D014241:Trichloroethylene; D008315:Malondialdehyde