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RNA transcripts for the quantification of differentiation allow marked improvements in the performance of embryonic stem cell test (EST).

Toxicology Letters 2015 November 5
Embryonic stem cell test (EST) is an in vitro validated assay for testing embryotoxicity. The EST needs improvements before being used for regulatory purposes, but also needs technical simplification for use in high throughput screenings. We propose the quantification in alterations of the differentiation of D3 monolayer cells cultures through the expression of biomarker genes in a shorter (5-day) and technically simpler (we use only monolayer cultures) test. We have defined a set of sixteen different genes biomarkers of ectoderm (Nrcam, Nes, Shh and Pnpla6), endoderm formation (Flk1 and Afp), mesoderm formation (Mesp1, Vegfa, Myo1e and Hdac7) and general cellular processes (Cdk1, Myc, Jun, Mixl, Cer and Wnt3). These, together with alterations in the viability of D3 and 3T3 cells and the prediction model of a classic EST, enhance the features of EST determinations to 100% concordance between in vivo-in vitro predictions with a set of seven different chemicals used in the validation of a classic EST. In conclusion, the proposed changes implemented in the classic EST confer it more reliability, speed and technical simplicity, which brings the EST closer to high throughput processes and regulatory purposes.

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