Collagen Overlay
Collagen Overlay - Related Videos
07:25
Collagen Hydrogels
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2023
Collagen is another widely used biomaterial that has found popularity in commercial applications, such as photography. Collagen has more recently been used in tissue engineering applications, by creating hydrogels that provide structure to engineered tissue. This video introduces collagen as a biomaterial, demonstrates how it is harvested from porcine skin, and shows how the material is used to create a hydrogel for tissue engineering applications. Finally, several applications of the material...
04:33
Evaluation of a Liquid Overlay System for Viral Plaque Assays
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2026
Source: Baer, A. and Kehn-Hall, K. Viral Concentration Determination Through Plaque Assays: Using Traditional and Novel Overlay Systems. J. Vis. Exp. (2014).This video demonstrates the use of a liquid microcrystalline cellulose-based overlay in a plaque-based assay by comparing its effectiveness in viral plaque formation with that of a traditional semi-solid agarose overlay.
09:28
Viral Concentration Determination Through Plaque Assays: Using Traditional and Novel Overlay Systems
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Cited by 466 •
2014
Plaque assays are the gold standard for viral quantification, utilizing entrapping overlays on host cellular monolayers to determine viral titers. While various semisolid overlays have traditionally been used, here we demonstrate plaque techniques comparing semisolid overlays to a novel liquid microcrystalline cellulose among several families of viruses.
06:38
Use of the Soft-agar Overlay Technique to Screen for Bacterially Produced Inhibitory Compounds
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Cited by 141 •
2017
We describe a simple method for screening bacterial cultures for the production of compounds inhibitory towards other bacteria.
07:03
Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides
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Cited by 18 •
2014
This procedure demonstrates in vivo near IR fluorescence imaging of collagen remodeling activities in mice as well as ex vivo staining of collagens in tissue sections using caged collagen mimetic peptides that can be photo-triggered to hybridize with denatured collagen strands.
FAQs
The overlay changes the physical context around adherent cells by replacing a flat surface alone with a porous fibrillar network. This added structure can influence cell shape and migration, while the surrounding matrix also affects signaling and access to soluble molecules. These effects make cellular responses interpretable within a more tissue-like setting.
A conventional monolayer provides limited structural context, whereas Collagen Overlay adds an extracellular matrix-like environment above the cells. This difference can reveal behaviors that depend on three-dimensional surroundings, including altered movement, signaling, or responses to soluble factors. The approach therefore supports comparisons between simplified flat cultures and more tissue-relevant experimental conditions.
Polymerization converts the neutralized collagen solution into a fibrillar network that remains over the adherent cells. The resulting porous layer supplies the structural context needed to influence cell shape, migration, signaling, and molecular access. Without this network, the culture would not acquire the matrix-associated features that distinguish the overlay from a standard monolayer.
The workflow begins with cells attached to a culture surface. A collagen solution is neutralized and placed over those adherent cells, after which it polymerizes into a fibrillar gel. Once formed, the overlay surrounds the cells with a porous extracellular matrix-like layer, creating the conditions for examining cellular behavior in a more structured environment.
Researchers can apply the technique when tissue-like structure is important for examining leukocyte movement, epithelial barrier responses, microbial invasion, or host-pathogen interactions. The overlay provides more environmental context than a flat monolayer while preserving experimental control, helping investigators assess how immune or infectious processes operate within a matrix-associated setting.
A collagen overlay can support analysis of changes in cell shape, migration, signaling, and access to soluble molecules. In infection-focused experiments, it can also provide structural context for interpreting epithelial responses, microbial invasion, and interactions between hosts and pathogens. Results can be considered alongside standard monolayer observations to identify effects associated with the added matrix environment.