Teratoma Formation Assessment
Teratoma Formation Assessment - Related Videos
08:56
Fate Mapping of Human Embryonic Stem Cells by Teratoma Formation
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Cited by 26 •
2010
Directed differentiation of hESCs into specific cells has generated much interest in regenerative medicine. We provide a concise, step-by-step protocol for determining the in vivo fate of selected hESCs that provides a valuable tool for characterizing tissue-specific reagents for cell-based therapy.
05:24
Teratoma Generation in the Testis Capsule
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Cited by 25 •
2011
Human pluripotent stem cells (hPSCs) have the potential to treat a myriad of different diseases. The utility of these cells lies in the fact that they can differentiate into any cell type in the body. Here we describe the teratoma assay, which is used to demonstrate the pluripotence of hPSCs.
03:47
Microscopic Assessment of Enzyme-Mediated Inhibition of Biofilm Formation
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2026
Source: Tay, S. B., et.al. Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases. J. Vis. Exp. (2016)This video demonstrates the process of inhibiting biofilm formation by introducing an enzyme that disrupts bacterial cell signaling. The enzyme prevents the bacteria from producing extracellular polymeric substances, thereby reducing biofilm development on a glass-bottomed microdish. Finally, the biofilm structure is visualized using fluorescent lectins and...
11:17
A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development
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Cited by 32 •
2012
We provide a simple, semi-quantitative method to investigate biofilm formation in vitro. This method takes advantage of the Zeiss stemi 2000-C Dissecting Microscope (with camera attachment) to monitor both the timing and pattern of biofilm formation, as assessed by the development of wrinkled colonies.
04:07
A Solid Phase Adherence Assay to Assess Biofilm Formation
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2025
The video demonstrates a solid-phase adherence assay for assessing biofilm formation. In a multi-well plate, bacteria in bile salt-supplemented media adhere to solid surfaces, forming biofilms, which is confirmed by colorimetry through crystal violet staining and ethanol treatment.
FAQs
The critical principle is breadth of differentiation, not simply tumor formation. A convincing result requires histological evidence of derivatives representing ectoderm, mesoderm, and endoderm within the growth. Because these three germ layers encompass multiple developmental lineages, their presence supports multilineage potential in the tested cell population rather than demonstrating only one specialized fate.
Teratoma formation assessment provides a broad test of pluripotency, whereas directed differentiation assays examine whether cells efficiently produce a chosen lineage under defined conditions. A cell line may generate representatives of all three germ layers in vivo yet still perform poorly in a particular directed differentiation protocol. The assay therefore supports characterization but does not substitute for lineage-specific performance testing.
Histological analysis converts the in vivo growth into interpretable evidence. Tissue sections are examined for representative derivatives of each embryonic germ layer, allowing investigators to determine whether the candidate line displayed multilineage differentiation. The assessment depends on identifying these tissue types, so an enlarging mass alone is not sufficient evidence of pluripotency.
At a basic workflow level, investigators introduce candidate pluripotent stem cells into immunodeficient animals, allow an in vivo growth to develop, and then analyze the resulting material histologically. The readout is tissue composition rather than growth alone: investigators look for representative ectodermal, mesodermal, and endodermal derivatives to support the assay’s conclusion.
Researchers apply the assay when they need in vivo evidence to help characterize embryonic or induced pluripotent stem cell lines. It is especially relevant when a line’s capacity for broad developmental potential must be assessed across the three germ layers. The resulting evidence can complement other characterization approaches while remaining focused on multilineage potential rather than a specific directed differentiation outcome.
The assay has important interpretive limits. It is time-consuming, and teratoma formation does not fully predict how efficiently the same cells will undergo a directed differentiation protocol. It also does not establish clinical safety. Consequently, a positive result should be treated as evidence of pluripotency-related potential, not as a complete assessment of research or clinical suitability.