PROTAC EZH2 Degrader-11

Suspension spheroid formation by low-adhesion or forced aggregation is a scaffold-free 3D culture method in which cells are prevented from attaching to plastic and are guided to interact with each other, forming compact multicellular aggregates through cell-cell adhesion, gravity-driven settling, microwell confinement, or centrifugation-assisted aggregation. The method detects the capacity of a cell population to self-assemble into spheroids, and the main readouts are spheroid formation efficiency, morphology, compactness, projected area or diameter, circularity, viability, proliferation, and experimental responses such as drug sensitivity. Classic implementations include hanging drops, agarose or hydrogel microwells, ultra-low-attachment round-bottom wells, and centrifugation-assisted aggregation in non-adherent wells. Low-adhesion culture shifts the system away from cell-substrate adhesion and toward cell-cell adhesion, while round-bottom or microwell geometry concentrates cells into

The following protocol uses the MTT colorimetric assay as a classic literature-established method for assessing cell viability/metabolic activity in cultured mammalian cells. MTT[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] is reduced by metabolically active cells to a colored formazan product; the amount of formazan is quantified spectrophotometrically and provides an indirect measure of metabolically active viable cells. Importantly, MTT reduction reflects cellular oxidoreductase/metabolic activity rather than an absolute direct count of living cells, so changes in cellular metabolism can alter the signal independently of cell number.