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Whereas current technologies such as pH, temperature, and osmolality shift require modifications of the cultivation medium, the use of optogenetic switches in recombinant producer cells might be a promising contact-free alternative. However, the proper application of optogenetically engineered cells requires a detailed understanding of basic cellular responses of cells that do not yet contain the optogenetic switches. The knowhow of ideal light exposure to enable the optimum use of related approaches is missing so far. Consequently, the current study set out to find optimum conditions for IgG1 producing Chinese hamster ovary (CHO) cells which were exposed to blue LED light. Growth characteristics, cell-specific productivity using enzyme-linked immunosorbent assay, as well as cell cycle distribution using flow cytometry were analyzed. Whereas too harsh light exposure causes detrimental growth effects that could be compensated with antioxidants, a surprising boost of cell-specific productivity by 57% occurred at optimum high light doses. The increase coincided with an increased number of cells in the G1 phase of the cell cycle after 72\u00a0h of illumination. The results present a promising new approach to boost biopharmaceutical productivity of mammalian cells simply by proper light exposure without any further optogenetic engineering.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Key points<\/jats:title>\n            <jats:p>\n              <jats:italic>\u2022 Blue LED light hinders growth in CHO DP-12 cells<\/jats:italic>\n            <\/jats:p>\n            <jats:p>\n              <jats:italic>\u2022 Antioxidants protect to a certain degree from blue light effects<\/jats:italic>\n            <\/jats:p>\n            <jats:p>\n              <jats:italic>\u2022 Illumination with blue LED light raises cell-specific productivity<\/jats:italic>\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s00253-024-13363-4","type":"journal-article","created":{"date-parts":[[2024,12,5]],"date-time":"2024-12-05T10:17:13Z","timestamp":1733393833000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Optimum blue light exposure: a means to increase cell-specific productivity in Chinese hamster ovary cells"],"prefix":"10.1007","volume":"108","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2332-5791","authenticated-orcid":false,"given":"Stefanie","family":"F\u00f6ller","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Niklas","family":"Regett","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Levin","family":"Lataster","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerald","family":"Radziwill","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ralf","family":"Takors","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,12,5]]},"reference":[{"key":"13363_CR1","doi-asserted-by":"publisher","first-page":"1234","DOI":"10.1002\/bit.22006","volume":"101","author":"WS Ahn","year":"2008","unstructured":"Ahn WS, Jeon J-J, Jeong Y-R, Lee SJ, Yoon SK (2008) Effect of culture temperature on erythropoietin production and glycosylation in a perfusion culture of recombinant CHO cells. 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