16α-Hydroxyestrone: Mass Spectrometry-Based Methodologies for the Identification of Covalent Adducts Formed with Blood Proteins.

Chemical Research in Toxicology
Catarina CharneiraAlexandra M M Antunes

Abstract

Elevated levels of the estrone metabolite, 16α-hydroxyestrone (16αOHE1), have been linked with multiple diseases. As an electrophilic reactive metabolite, covalent binding to proteins is thought to constitute one of the possible mechanisms in the onset of deleterious health outcomes associated with 16αOHE1. Whereas mass spectrometry (MS)-based methodologies are currently considered the best suited to monitor the formation of protein covalent adducts, the application of these approaches for the identification of covalent adducts of 16αOHE1 is yet to be provided. In the present study, with the ultimate goal of determining the most adequate methodology for searching for 16αOHE1-derived covalent adducts, we explored multiple liquid chromatography-electrospray ionization tandem high-resolution mass spectrometry (LC-ESI-HRMS/MS)-based approaches to investigate the nature and specific locations of the covalent adducts produced in human hemoglobin (Hb) and human serum albumin (HSA) modified in vitro with 16αOHE1. The application of a "bottom up" proteomics approach, involving the nanoLC-ESI-HRMS/MS analysis of tryptic peptides, allowed the identification of multiple sites of 16αOHE1 adduction in Hb and HSA. As expected, the majority of...Continue Reading

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Citations

Nov 14, 2021·Archives of Toxicology·Gabriele Sabbioni, Billy W Day

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