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N6-Formyllysine as a Biomarker of Formaldehyde Exposure: Formation and Loss of N6-Formyllysine in Nasal Epithelium in Long-Term, Low-Dose Inhalation Studies in Rats.

Abstract：

:Exposure to both endogenous and exogenous formaldehyde has been established to be carcinogenic, likely by virtue of forming nucleic acid and proteins adducts such as N6-formyllysine. To better assess N6-formyllysine as a biomarker of formaldehyde exposure, we studied accumulation of N6-formyllysine adducts in tissues of rats exposed by inhalation to 2 ppm [13C2H2]-formaldehyde for 7, 14, 21, and 28 days (6 h/day) and investigated adduct loss over a 7-day postexposure period using liquid chromatography-coupled tandem mass spectrometry. Our results showed formation of exogenous adducts in nasal epithelium and to some extent in trachea but not in distant tissues of lung, bone marrow, or white blood cells, with a 2-fold increase over endogenous N6-formyllysine over a 3-week exposure period. Postexposure analyses indicated a biexponential decay of N6-formyllysine in proteins extracted from different cellular compartments, with half-lives of ∼25 and ∼182 h for the fast and slow phases, respectively, in cytoplasmic proteins. These results parallel the behavior of DNA adducts and DNA-protein cross-links, with protein adducts cleared faster than DNA-protein cross-links, and point to the potential utility of N6-formyllysine protein adducts as biomarkers of formaldehyde.

journal_name

Chem Res Toxicol

journal_title

Chemical research in toxicology

authors

Edrissi B,Taghizadeh K,Moeller BC,Yu R,Kracko D,Doyle-Eisele M,Swenberg JA,Dedon PC

doi

10.1021/acs.chemrestox.7b00075

subject

Has Abstract

pub_date

2017-08-21 00:00:00

pages

1572-1576

issue

8

eissn

0893-228X

issn

1520-5010

journal_volume

30

pub_type

杂志文章

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