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Consistent cell preparation is a fundamental preliminary step for understanding complex cellular mechanisms in various cell-based research fields, including basic cell biology, cancer research, and tissue engineering. However, certain elusive factors, such as cellular de-differentiation and contamination with mycoplasma or other types of cells, have compromised the reproducibility and reliability of cell-based approaches. Here, we propose an  epi  relief-contrast cellular monitoring system (eRC-CMS) that allows images of cells in a typical culture plate to be acquired, stored, and analysed for daily cell quality control. Due to its full flatbed nature and automated system, cells placed at any location on the stage can be analysed without special attention. Using this system, changes in the size, circularity, and proliferation of endothelial cells in subculture were recorded. Analyses of images of ~9,930,000 individual cells revealed that the growth activity and cell circularity in subcultures were closely correlated with their angiogenic activity in a subsequent hydrogel assay, demonstrating that eRC-CMS is useful for assessing cell quality in advance. We further demonstrated that eRC-CMS was feasible for the imaging of neurite elongation and spheroid formation. This system may provide a robust and versatile approach for daily cell preparation to facilitate reliable and reproducible cell-based studies.

Flatbed epi relief-contrast cellular monitoring system for stable cell culture