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We hypothesize that H<jats:sub>2<\/jats:sub>S also serves in extended oxygen sensing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Here, we compare the effects of extended exposure (24\u201048\u00a0hours) to varying O<jats:sub>2<\/jats:sub> tensions on H<jats:sub>2<\/jats:sub>S and polysulphide metabolism in human embryonic kidney (HEK 293), human adenocarcinomic alveolar basal epithelial (A549), human colon cancer (HTC116), bovine pulmonary artery smooth muscle, human umbilical\u2010derived mesenchymal stromal (stem) cells and porcine tracheal epithelium (PTE) using sulphur\u2010specific fluorophores and fluorometry or confocal microscopy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>All cells continuously produced H<jats:sub>2<\/jats:sub>S in 21% O<jats:sub>2<\/jats:sub> and H<jats:sub>2<\/jats:sub>S production was increased at lower O<jats:sub>2<\/jats:sub> tensions. Decreasing O<jats:sub>2<\/jats:sub> from 21% to 10%, 5% and 1% O<jats:sub>2<\/jats:sub> progressively increased H<jats:sub>2<\/jats:sub>S production in HEK293 cells and this was partially inhibited by a combination of inhibitors of H<jats:sub>2<\/jats:sub>S biosynthesis, aminooxyacetate, propargyl glycine and compound 3. Mitochondria appeared to be the source of much of this increase in HEK 293 cells. H<jats:sub>2<\/jats:sub>S production in all other cells and PTE increased when O<jats:sub>2<\/jats:sub> was lowered from 21% to 5% except for HTC116 cells where 1% O<jats:sub>2<\/jats:sub> was necessary to increase H<jats:sub>2<\/jats:sub>S, presumably reflecting the hypoxic environment in vivo. Polysulphides (H<jats:sub>2<\/jats:sub>S<jats:sub>n<\/jats:sub>, where n\u00a0=\u00a02\u20107), the key signalling metabolite of H<jats:sub>2<\/jats:sub>S also appeared to increase in many cells although this was often masked by high endogenous polysulphide concentrations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>These results show that cellular H<jats:sub>2<\/jats:sub>S is increased during extended hypoxia and they suggest this is a continuously active O<jats:sub>2<\/jats:sub>\u2010sensing mechanism in a variety of cells.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apha.13368","type":"journal-article","created":{"date-parts":[[2019,8,23]],"date-time":"2019-08-23T18:33:35Z","timestamp":1566585215000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Extended hypoxia\u2010mediated H<sub>2<\/sub>S production provides for long\u2010term oxygen 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