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The Cell Counting Kit-8 (CCK-8) cell viability assay, also known as WST-8, is widely recognized for its nontoxic nature, making it suitable for further studies on treated cells. This practice is commonly observed in the field of tissue engineering. While live/dead imaging may not readily reveal macroscopic differences, our investigation has uncovered significant intracellular metabolic changes. Notably, we observed substantial down-regulation of metabolites within the glycolysis and pentose phosphate pathways. These metabolic alterations predominantly affect energy metabolism and may potentially impact the cellular redox environment. In light of these findings, we strongly recommend that researchers exercise caution when using cells treated with CCK-8 in subsequent experiments.
Fan et al. (Mon,) studied this question.
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