MC38 SLP Adpgk

Ex vivo organotypic tissue slice cultures are based on maintaining thin, viable tissue sections at an air-liquid interface to preserve native cytoarchitecture and local cell-matrix interactions, enabling observation of cell behavior such as migration and tissue infiltration within a physiologically relevant 3D microenvironment. The method relies on maintaining tissue viability on porous membrane supports, allowing diffusion of nutrients and oxygen while preserving structural integrity for extended culture periods, which makes it suitable for studying dynamic cellular processes in intact tissue contexts such as cell movement and tissue remodeling. .

The organotypic 3D invasion assay measures carcinoma-cell invasion into a fibroblast-remodeled extracellular matrix, usually collagen I with or without basement-membrane matrix, under an air-liquid or grid-supported culture condition; the readout is invasion depth, invaded area, or an invasion index from histological or fluorescence images. This assay models stromal regulation of invasion because fibroblasts or CAFs remodel matrix, generate tracks, and can lead collective carcinoma-cell invasion; the resulting cancer-cell penetration into the gel reflects tumor-stroma-ECM interactions rather than migration on a rigid 2D substrate.

Cell invasion is the ability of cells to migrate from one area to another via the extracellular matrix. Cell invasion is the response of normal and cancer cells to chemical and mechanical stimuli. Before migrating to a new region, the extracellular matrix is degraded by proteases within the cell. Cell invasion often occurs during wound repair, vascularization and inflammation, abnormal tissue invasion, and tumor cell metastasis.

3D tumor spheroid invasion assay measures outward tumor-cell movement from a compact multicellular spheroid into a surrounding extracellular matrix, producing image-based readouts such as invasion area, invasion distance, cell dispersion, or time-resolved cell movement. The method models tumor-cell interaction with matrix components in three dimensions and is used to study invasive phenotypes in cancer models including glioblastoma, squamous cell carcinoma, breast cancer, prostate cancer, ovarian cancer, and other solid tumor systems.

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.