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Article Abstract

The Oredsson universal replacement (OUR) medium is the formulation of a universal xeno-free medium designed for the cultivation of human normal and cancer cells in 2D and 3D cultures. Here, we present a protocol for the use of OUR medium for routine culturing, cell banking, and medium modification for suspension culture. We describe steps for thawing, sub-culturing, and freezing cells. We then detail procedures for using these techniques for VERO, A549, THP-1, and Jurkat cells.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12076805PMC
http://dx.doi.org/10.1016/j.xpro.2025.103781DOI Listing

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The Oredsson universal replacement (OUR) medium is the formulation of a universal xeno-free medium designed for the cultivation of human normal and cancer cells in 2D and 3D cultures. Here, we present a protocol for the use of OUR medium for routine culturing, cell banking, and medium modification for suspension culture. We describe steps for thawing, sub-culturing, and freezing cells.

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Despite limitations like poor mimicry of the human cell microenvironment, contamination risks, and batch-to-batch variation, cell culture media with animal-derived components such as fetal bovine serum (FBS) have been used for decades. Moreover, a few reports have used animal-product-free media in advanced high throughput three-dimensional (3D) models that closely mimic conditions. To address these challenges, we combined a high throughput 3D model with an open access, FBS-free chemically-defined medium, Oredsson Universal Replacement (OUR) medium, to create a more realistic 3D drug screening system.

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Since 1958, cell culture media supplemented with fetal bovine serum is used, despite the well-known concerns about animal welfare, reproducibility, reliability, relevance, and safety. To obliterate these concerns and increase scientific accuracy, we recently published an open access, publicly available paper on a defined medium composition to make it possible for any lab to prepare this medium. The medium supports routine culturing and cell banking as well as investigations of growth curves, dose response testing of compounds of cells in 2D and 3D, and cell migration; all important aspects for research and toxicology.

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Cell culturing methods are increasingly used to reduce and replace the use of live animals in biomedical research and chemical toxicity testing. Although live animals are avoided when using cell culturing methods, they often contain animal-derived components of which one of the most commonly used is foetal bovine serum (FBS). FBS is added to cell culture media among other supplements to support cell attachment/spreading and cell proliferation.

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