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Effects of photodeoxygenation on cell biology using dibenzothiophene S-oxide derivatives as O(3P)-precursors.

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology (2021-11-26)
Ankita Isor, Austin T O'Dea, Scott F Grady, John T Petroff, Kristin N Skubic, Bashar Aziz, Christopher K Arnatt, Ryan D McCulla
ABSTRACT

Photodeoxygenation of dibenzothiophene S-oxide and its derivatives have been used to generate atomic oxygen [O(3P)] to examine its effect on proteins, nucleic acids, and lipids. The unique reactivity and selectivity of O(3P) have shown distinct oxidation products and outcomes in biomolecules and cell-based studies. To understand the scope of its global impact on the cell, we treated MDA-MB-231 cells with 2,8-diacetoxymethyldibenzothiophene S-oxide and UV-A light to produce O(3P) without targeting a specific cell organelle. Cellular responses to O(3P)-release were analyzed using cell viability and cell cycle phase determination assays. Cell death was observed when cells were treated with higher concentrations of sulfoxides and UV-A light. However, significant differences in cell cycle phases due to UV-A irradiation of the sulfoxide were not observed. We further performed RNA-Seq analysis to study the underlying biological processes at play, and while UV-irradiation itself influenced gene expression, there were 9 upregulated and 8 downregulated genes that could be attributed to photodeoxygenation.

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GenElute Total RNA Purification Kit