What question did this study set out to answer?

To determine whether reactive lipid peroxidation products interact directly with adenine and cytosine derivatives to form etheno-nucleobase adducts.

March 1, 1995Chemical Research in Toxicology

Formation of 1,N6-Ethenoadenine and 3,N4-Ethenocytosine by Lipid Peroxidation Products and Nucleic Acid Bases

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To determine whether reactive lipid peroxidation products interact directly with adenine and cytosine derivatives to form etheno-nucleobase adducts.
Incubated rat liver microsomes at 37°C for 30 minutes with lipid peroxidation inducers (Fe(II) or cumene hydroperoxide) and adenine or cytosine nucleosides/nucleotides, followed by heating at 80°C for 30 minutes.
Isolated and measured specific etheno adducts using immunoaffinity chromatography combined with HPLC/fluorimetry, competitive radioimmunoassay, and 32P-postlabeling.
Assayed direct adduct formation by incubating purified arachidonic acid and Fe(II) in the presence of cAMP.
Detected the generation of 1,N6-etheno-cAMP, 1,N6-etheno-2'-deoxyadenosine, and 3,N4-etheno-2'-deoxycytidine nucleoside derivatives from microsome-mediated lipid peroxidation.
Identified corresponding nucleotide adducts, including 1,N6-etheno-2'-deoxyadenosine 3'-monophosphate and 3,N4-etheno-2'-deoxycytidine 3'-monophosphate, using 32P-postlabeling.
Demonstrated that iron-supplemented arachidonic acid oxidation directly yields 1,N6-etheno adducts from cAMP, pointing to etheno adducts as markers of lipid peroxidation-related DNA damage.

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Implication

Experimental study demonstrates the formation of etheno base adducts by lipid peroxidation products in rat liver microsomes, suggesting their utility as biomarkers of oxidative DNA damage.

Cite This Study

Ghissassi et al. (1995) studied this question.

synapsesocial.com/papers/6a787e222e130d02afed2ca0 https://doi.org/10.1021/tx00044a013

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Implication

Experimental study demonstrates the formation of etheno base adducts by lipid peroxidation products in rat liver microsomes, suggesting their utility as biomarkers of oxidative DNA damage.

Formation of 1,N6-Ethenoadenine and 3,N4-Ethenocytosine by Lipid Peroxidation Products and Nucleic Acid Bases

Key Points

Discussion

Implication

Cite This Study

Formation of 1,N6-Ethenoadenine and 3,N4-Ethenocytosine by Lipid Peroxidation Products and Nucleic Acid Bases

Key Points

Discussion

Implication

Cite This Study

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