In Vitro Assay
In Vitro Assay - Related Videos
09:55
In vitro Cell Migration and Invasion Assays
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Cited by 627 •
2014
Commonly used, highly accessible methods for examining cell migration and invasion in vitro are described. The first method is the cell wound closure assay that measures cell motility. The second method is the transwell migration and invasion assay that assesses the chemotactic and invasive capacity of cells.
07:53
An In vitro FluoroBlok Tumor Invasion Assay
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Cited by 23 •
2009
This video demonstrates how to measure cell invasion through cell culture inserts using a fluorescence-based methodology.
10:17
Analysis of Schwann-astrocyte Interactions Using In Vitro Assays
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Cited by 6 •
2011
This article intends to describe in stepwise fashion the commonly used in vitro assays used in studying Schwann cell-asrtocyte interactions.
09:22
In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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Cited by 21 •
2015
Unmodified and hyperphosphorylated tau proteins were used in two in vitro aggregation assays to reveal the hyperphosphorylation-dependent fast aggregation kinetics. These assays pave the way for future screens for compounds that can modulate the propensity of hyperphosphorylated tau to form fibrils that underlie the progression of Alzheimer’s disease.
09:28
In Vitro Transcription Assays and Their Application in Drug Discovery
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Cited by 6 •
2016
In this manuscript, we describe a protocol to functionally examine transcription and the inhibitory activity of antibacterial agents targeting bacterial transcription.
FAQs
Controlled conditions let an investigator isolate a biochemical reaction, cell system, or tissue sample and expose it to defined substances or conditions. This reduces experimental complexity and makes changes in the measured biological response easier to attribute to the tested factor. The approach is particularly useful when precise comparisons are needed across treatments or experimental conditions.
The endpoint determines what the assay can reveal: enzyme activity indicates a reaction’s catalytic output, cell viability reflects whether cells remain viable, binding measures an interaction, and gene expression tracks changes in gene activity. Selecting among these readouts should match the biological response being investigated, so results can be interpreted in relation to the study question.
Appropriate controls provide the comparison needed to judge whether a measured endpoint changes under the tested substance or condition. They help distinguish the response associated with the experimental exposure from the level observed in the comparison condition. This strengthens precise comparisons and supports more meaningful interpretation of assay results.
A practical workflow begins by selecting a biochemical reaction, cell system, or tissue sample, then exposing it to defined substances or conditions. The investigator measures a suitable endpoint, such as enzyme activity, cell viability, binding, or gene expression, and evaluates that measurement against appropriate controls. This sequence links the experimental condition to a quantifiable biological response.
In vitro assay results can support studies of molecular mechanisms, disease processes, drug efficacy, and toxicity. By testing these questions under controlled conditions, researchers can make precise comparisons among defined substances or conditions and quantify a selected biological endpoint. This makes the method useful for evaluating biological responses before further cellular, animal, or clinical research.
An isolated reaction, cell system, or tissue sample does not fully reproduce the conditions of a living organism. Consequently, a result may show how a biological activity or response behaves under the assay’s defined conditions without capturing the full complexity of an intact system. Findings can therefore guide, rather than replace, cellular, animal, or clinical research.