Sphere Formation Assay
Sphere Formation Assay - Related Videos
03:09
Sphere Formation Assay: An In Vitro Method to Identify Pancreatic Cancer Stem Cells and Screen Therapies
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08:39
Evaluation of Stem Cell Properties in Human Ovarian Carcinoma Cells Using Multi and Single Cell-based Spheres Assays
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In vitro spheres assays are commonly used to identify cancer stem cells. Here we compare single with multi cell-based spheres assays. The more laborious single cell-based assays or methylcellulose supplementation give more accurate results while multi cell-based assays performed in liquid medium can be highly influenced by cell density.
03:57
Microtiter Dish Biofilm Formation Assay
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10:51
Mammosphere Formation Assay from Human Breast Cancer Tissues and Cell Lines
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Floating mammosphere assays can investigate the subset of stem-like breast cancer cells that survive in suspension conditions and show enhanced tumorigenesis when implanted into mice. This protocol provides a convenient in vitro measure of sphere-forming ability, a proxy for in vivo tumorigenesis, while facilitating analysis of the stem-associated transcriptional landscape.
FAQs
Nonadherent culture changes which cells can expand: cells must persist without attachment and respond to the supplied growth factors in serum-free medium. Under these selective conditions, sphere production can enrich populations with self-renewal or progenitor-like properties rather than simply reflecting cells that grow well in standard attached culture. This makes the assay useful for probing cellular potential.
Sphere number, size, and performance after serial passaging provide complementary evidence about cellular behavior. Sphere number reflects how many cells generate colonies under the assay conditions, while size indicates the extent of expansion within those structures. Serial passaging tests whether sphere-forming capacity persists across rounds, helping assess clonogenicity and renewal more rigorously than a single measurement.
Sphere formation alone cannot establish stem-cell identity because the assay measures behavior under particular culture conditions, not a definitive cellular state. Cells may form spheres while differing in their underlying properties, and sphere-forming capacity can reflect clonogenic or progenitor-like potential without proving stemness. Researchers therefore interpret the result as functional evidence rather than a standalone identity test.
A basic workflow places cells in nonadherent vessels containing serum-free medium and defined growth factors, then allows sphere structures to develop under those conditions. Researchers subsequently evaluate sphere number and size and may dissociate or transfer spheres for serial passaging. Keeping the culture conditions defined is important because they shape which cellular properties the assay reveals.
The assay is useful when researchers need to examine self-renewal, clonogenicity, or progenitor-like behavior in biological systems. It supports investigations of neural stem cells, cancer stem cells, tumor heterogeneity, and developmental potential. Because the readouts compare sphere formation under defined conditions, the method can also help distinguish functional differences among cell populations.
Candidate drug studies can use changes in sphere number, size, or serial passaging performance as functional readouts of altered cellular capacity. A treatment that changes these measures may affect survival, proliferation, organization, or renewal under the assay conditions. In cancer biology, this approach connects drug response with properties associated with tumor heterogeneity and stem-like populations.