{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T04:35:31Z","timestamp":1791866131546,"version":"4.3.4"},"reference-count":26,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2014,6,25]],"date-time":"2014-06-25T00:00:00Z","timestamp":1403654400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In the progress of allergic and irritant contact dermatitis, chemicals that cause the generation of reactive oxygen species trigger a heat shock response in keratinocytes. In this study, an optical sensor cell line based on cultured human keratinocytes (HaCaT cells) expressing green fluorescent protein (GFP) under the control of the stress-inducible HSP70B\u2019 promoter were constructed. Exposure of HaCaT sensor cells to 25 \u00b5M cadmium, a model substance for oxidative stress induction, provoked a 1.7-fold increase in total glutathione and a ~300-fold induction of transcript level of the gene coding for heat shock protein HSP70B\u2019. An extract of Arnica montana flowers resulted in a strong induction of the HSP70B\u2019 gene and a pronounced decrease of total glutathione in keratinocytes. The HSP70B\u2019 promoter-based sensor cells conveniently detected cadmium-induced stress using GFP fluorescence as read-out with a limit of detection of 6 \u00b5M cadmium. In addition the sensor cells responded to exposure of cells to A. montana extract with induction of GFP fluorescence. Thus, the HaCaT sensor cells provide a means for the automated detection of the compromised redox status of keratinocytes as an early indicator of the development of human skin disorders and could be applied for the prediction of skin irritation in more complex in vitro 3D human skin models and in the development of micro-total analysis systems (\u00b5TAS) that may be utilized in dermatology, toxicology, pharmacology and  drug screenings.<\/jats:p>","DOI":"10.3390\/s140711293","type":"journal-article","created":{"date-parts":[[2014,6,26]],"date-time":"2014-06-26T02:28:30Z","timestamp":1403749710000},"page":"11293-11307","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["A Sensitive Sensor Cell Line for the Detection of Oxidative Stress Responses in Cultured Human Keratinocytes"],"prefix":"10.3390","volume":"14","author":[{"given":"Ute","family":"Hofmann","sequence":"first","affiliation":[{"name":"Department of Medical Engineering and Biotechnology, University of Applied Sciences Jena,  Carl-Zeiss-Promenade 2, 07745 Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Melanie","family":"Priem","sequence":"additional","affiliation":[{"name":"Department of Medical Engineering and Biotechnology, University of Applied Sciences Jena,  Carl-Zeiss-Promenade 2, 07745 Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine","family":"Bartzsch","sequence":"additional","affiliation":[{"name":"Department of Medical Engineering and Biotechnology, University of Applied Sciences Jena,  Carl-Zeiss-Promenade 2, 07745 Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Winckler","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutical Biology, Institute of Pharmacy, Friedrich-Schiller-University of Jena, Semmelweisstra\u00dfe 10, 07743 Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karl-Heinz","family":"Feller","sequence":"additional","affiliation":[{"name":"Department of Medical Engineering and Biotechnology, University of Applied Sciences Jena,  Carl-Zeiss-Promenade 2, 07745 Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2014,6,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/j.jdermsci.2012.06.006","article-title":"Impact of reactive oxygen species on keratinocyte signaling pathways","volume":"68","author":"Bito","year":"2012","journal-title":"J. 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