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The experiments were conducted on eleven cell lines with different proliferative activities and oxidative capacities, confirmed by conventional analytical tests. The data suggest that cancer cells and noncancer cells are characterized by a completely different redox status. This can be analyzed by EPR spectroscopy using mito-TEMPO and methoxy-TEMPO, but not carboxy-PROXYL. The correlation analysis shows that the EPR signal intensity of mito-TEMPO in cell suspensions is closely related to the superoxide level. The described methodology allows the detection of overproduction of superoxide in living cells and their identification based on the intracellular redox status. The experimental data provide evidences about the role of superoxide and hydroperoxides in cell proliferation and malignancy.<\/jats:p>","DOI":"10.1155\/2019\/6373685","type":"journal-article","created":{"date-parts":[[2019,4,8]],"date-time":"2019-04-08T19:30:51Z","timestamp":1554751851000},"page":"1-18","source":"Crossref","is-referenced-by-count":9,"title":["\u201cRedox Imaging\u201d to Distinguish Cells with Different Proliferative Indexes: Superoxide, Hydroperoxides, and Their Ratio as Potential Biomarkers"],"prefix":"10.1155","volume":"2019","author":[{"given":"Zhivko","family":"Zhelev","sequence":"first","affiliation":[{"name":"Medical Faculty, Trakia University, 11 Armejska Str., Stara Zagora 6000, Bulgaria"},{"name":"Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 21 Acad. G. 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