Please use this identifier to cite or link to this item: doi:10.22028/D291-34582
Title: EPR Study of KO2 as a Source of Superoxide and •BMPO-OH/OOH Radical That Cleaves Plasmid DNA and Detects Radical Interaction with H2S and Se-Derivatives
Author(s): Misak, Anton
Brezova, Vlasta
Chovanec, Miroslav
Luspai, Karol
Nasim, Muhammad Jawad
Grman, Marian
Tomasova, Lenka
Jacob, Claus
Ondrias, Karol
Language: English
Title: Antioxidants
Volume: 10
Issue: 8
Publisher/Platform: MDPI
Year of Publication: 2021
Free key words: KO2
EPR spectra simulation
BMPO-OOH spin adduct
hydrogen sulfide
cleavage DNA
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: : Superoxide radical anion (O2 •−) and its derivatives regulate numerous physiological and pathological processes, which are extensively studied. The aim of our work was to utilize KO2 as a source of O2 •− and the electron paramagnetic resonance (EPR) spin trapping 5-tert-butoxycarbonyl-5- methyl-1-pyrroline N-oxide (BMPO) technique for the preparation of •BMPO-OOH and/or •BMPOOH radicals in water solution without DMSO. The method distinguishes the interactions of various compounds with •BMPO-OOH and/or •BMPO-OH radicals over time. Here, we show that the addition of a buffered BMPO-HCl mixture to powdered KO2 formed relatively stable •BMPO-OOH and •BMPO-OH radicals and H2O2 , where the •BMPO-OOH/OH ratio depended on the pH. At a final pH of ~6.5–8.0, the concentration of •BMPO-OOH radicals was ≥20 times higher than that of •BMPO-OH, whereas at pH 9.0–10.0, the •BMPO-OH radicals prevailed. The •BMPO-OOH/OH radicals effectively cleaved the plasmid DNA. H2S decreased the concentration of •BMPO-OOH/OH radicals, whereas the selenium derivatives 1-methyl-4-(3-(phenylselanyl) propyl) piperazine and 1-methyl-4-(4-(phenylselanyl) butyl) piperazine increased the proportion of •BMPO-OH over the •BMPO-OOH radicals. In conclusion, the presented approach of using KO2 as a source of O2 •−/H2O2 and EPR spin trap BMPO for the preparation of •BMPO-OOH/OH radicals in a physiological solution could be useful to study the biological effects of radicals and their interactions with compounds.
DOI of the first publication: 10.3390/antiox10081286
Link to this record: urn:nbn:de:bsz:291--ds-345829
ISSN: 2076-3921
Date of registration: 27-Aug-2021
Description of the related object: Supplementary Materials
Related object:
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Pharmazie
Professorship: NT - Prof. Dr. Claus Jacob
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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