Cerebral organoid culture is a cutting-edge in vitro modeling technique that utilizes human pluripotent stem cells-including both embryonic stem cells and induced pluripotent stem cells—to simulate the microenvironment and differentiation programs of human embryonic brain development within a three-dimensional in vitro culture system. Through directed differentiation, it generates structures characteristic of specific brain regions and comprises various functional neuronal cell types. This technology serves as a sophisticated model capable of recapitulating the processes of human brain development and the pathological features of neurological diseases, thereby finding application in mechanistic research, drug screening, and precision medicine.
3D Cell Culture and Organoids
3D cell culture is a technology that cultivates cells in a three-dimensional structure to simulate the environment closer to the body. Compared with traditional 2D culture, 3D culture provides more realistic cell interactions, tissue structure and cell function. This culture method is widely used in biomedical research, drug screening, and tissue engineering. By creating three-dimensional structures that more closely resemble the environment within an organism, 3D cell culture helps more accurately simulate biological processes such as disease development, drug response, and tissue reconstruction.
Related Experimental Schemes
iPSC-derived organoid differentiation uses staged developmental signaling to guide pluripotent cells into lineage-specific progenitors, followed by three-dimensional self-organization into tissue-like structures. Classic examples include cerebral organoids formed through embryoid-body neural induction and 3D expansion, intestinal and gastric organoids formed through definitive endoderm and gut-patterning stages, kidney organoids formed through intermediate-mesoderm induction, lung organoids formed through definitive-endoderm, anterior-foregut, and ventral-lung patterning, and liver buds formed by combining iPSC-derived hepatic endoderm with endothelial and mesenchymal cells. The readout is organoid morphology plus lineage-marker evidence, such as cortical neural progenitor and neuron organization in cerebral organoids, FOXA2/SOX17 definitive endoderm and CDX2 hindgut identity in intestinal differentiation, nephron and collecting-duct-associated structures in kidney organoids, foregut/l
3D hydrogel synthetic scaffold culture embeds cells, spheroids, organoids, or tissue fragments inside a hydrated crosslinked polymer network so that cells receive matrix and cell-cell cues in three dimensions rather than from a flat plastic surface. A literature-supported model protocol is PEG-4MAL hydrogel culture, in which four-arm maleimide-terminated PEG is functionalized with cysteine-containing adhesive peptides such as RGD and crosslinked with protease-degradable peptides such as GPQ-W; this creates a defined, modular scaffold that supports human organoid generation and culture. The readouts are scaffold-supported growth, morphology, lumen formation, budding, viability, proliferation, lineage-marker expression, and matrix-dependent expansion or differentiation; reported assays include transmitted-light imaging, immunofluorescence, in situ hybridization, qRT-PCR, and rheological characterization.
Patient-derived organoids (PDOs) are 3D in vitro models derived from patient tumor tissues that recapitulate the histological, genetic, and functional heterogeneity of the original tumors. These models are established by isolating tumor cells or tissue fragments and culturing them in a 3D extracellular matrix (ECM), such as Matrigel or decellularized ECM, to support self-organization, proliferation, and differentiation. The culture system preserves key features of the tumor microenvironment, including cell-cell interactions, stromal components, and ECM signaling, enabling accurate modeling of tumor biology and drug response for personalized medicine applications.
ALI organoid culture places organoid-derived epithelial cells or tissue fragments on a porous support or collagen-based matrix so that basal surfaces receive medium while the apical surface is exposed to air; in lung organoid-derived ALI cultures, this supports airway epithelial differentiation, barrier formation, mucus production, beating cilia, and pseudostratified epithelial architecture. Gastrointestinal ALI organoid systems similarly support long-term 3D epithelial growth with stromal/mesenchymal components and multilineage differentiation. The main readouts are morphology, barrier integrity, epithelial differentiation, and experimental response readouts. Lung ALI protocols used bright-field microscopy, TEER monitoring, immunofluorescence for ciliated, goblet, club, and basal-cell markers, flow cytometry, viral titration, RNA-seq, and spatial transcriptomic readouts after SARS-CoV-2 infection.
Organoid passaging by mechanical expansion transfers established 3D epithelial organoids from an extracellular matrix dome into fresh matrix after physical fragmentation. The readout is successful re-formation and expansion of organoid fragments into new organoids, reflecting survival of organoid-forming epithelial stem/progenitor cells and continued self-organization in a 3D matrix.
ECM-embedded organoid dome culture embeds epithelial stem cells, crypts, organoid fragments, or tumor-derived epithelial cells in a basement-membrane-like hydrogel such as Matrigel, allowing 3D growth, self-organization, lumen formation, budding or cystic morphogenesis, and lineage maintenance under defined niche-factor-containing medium. The primary readouts are organoid establishment efficiency, growth, morphology, passaging capacity, lineage-marker expression, and, when fluorescently labeled lines are used, microscopy- or flow-cytometry-based quantification of population behavior in 3D culture.
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
Hanging drop spheroid culture is a scaffold-free 3D culture method in which a small droplet of cell suspension is inverted so that suspended cells sediment by gravity toward the lowest point of the drop, aggregate, and form a multicellular spheroid with direct cell-cell contact. Spheroids generated by this method are used to study 3D cell cohesion, cell-ECM interactions, drug response, co-culture organization, and tumor-like microenvironmental behavior. The primary readouts are spheroid formation efficiency, spheroid size, circularity or compactness, viability, and treatment response; these can be measured by bright-field microscopy, fluorescence viability staining, ATP-, fluorescence-, or colorimetric-based assays, and image-based diameter or volume calculations.
