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• W2076039152 abstract "Recent studies have demonstrated that circulating antibodies against malondialdehyde-acetaldehyde (MAA)-haptenated proteins are significantly increased in patients with alcohol-induced cirrhosis and hepatitis and correlate with the severity of liver damage. Additionally, when proteins are haptenated with MAA, they become highly immunogenic in vivo in the absence of adjuvants. However, the mechanism(s) of this immunogenicity are currently unknown. Initial in vitro studies on the effects of MAA-modified proteins on cells demonstrated an increase in cell death at concentrations that were cell type specific and time-dependent. Since immunogenicity due to cell death has been described, we investigated the mechanism(s) by which cell death was occurring. Assessment of cell death in splenocytes after 1 h found significant levels of apoptosis as compared to controls. After 5 h, a significant and dose-dependent necrosis occurred in which cells were exposed to >62.5 microg/ml (43.1 mM) MAA-haptenated protein. After 24 h, exposure to >31.3 microg/ml (21.6 mM) MAA-haptenated protein resulted in significant levels of necrosis, although DNA laddering studies found apoptosis was occurring as well. Morphological changes in the cells were observed by light microscopy that correlated with a low forward scatter population by flow cytometry. Since necrosis has been implicated in enhancing both primary and secondary immune responses, and necrosis was predominantly occurring in response to MAA-haptenated proteins, a possible mechanism by which the immunogenicity of MAA modification of proteins in vivo may occur is suggested. Specifically, MAA modification of self proteins may result in the death of various cell types, most likely those in the liver. These necrotic materials may induce anti-MAA antibodies and other auto antibodies, whose levels may then correlate with the severity of ALD." @default.
• W2076039152 created "2016-06-24" @default.
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• W2076039152 date "2002-03-01" @default.
• W2076039152 modified "2023-09-24" @default.
• W2076039152 title "Malondialdehyde–acetaldehyde-haptenated protein induces cell death by induction of necrosis and apoptosis in immune cells" @default.
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• W2076039152 doi "https://doi.org/10.1016/s1567-5769(01)00195-3" @default.
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• W2076039152 hasPublicationYear "2002" @default.
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