Collagen Modification
Collagen Modification - Related Videos
07:25
Collagen Hydrogels
0 Views •
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...
02:32
Histone Modification
0 Views •
2020
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression. Acetylation The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25
Spreading of Chromatin Modifications
0 Views •
2020
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex. Writers The writer is an enzyme that can...
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.
05:17
An Improved Method for the Preparation of Type I Collagen From Skin
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Cited by 23 •
2014
Traditional procedures for the isolation of soluble type 1 collagen (COL1) require about 10 days from start to finish because of lengthy buffer incubations and laborious resuspensions of fibrils. Here, we describe a means to purify COL1 from small dermal biopsies in less than 3 hr.
FAQs
Targeting amino acid side chains can introduce new functional groups or change existing chemical reactivity. These changes influence how collagen molecules interact with one another and with surrounding components, which can alter crosslinking, degradation, and biological performance. In bioengineering, this molecular control helps tune collagen for materials requiring different combinations of stability, stiffness, cell interaction, or delivery behavior.
Crosslinking adjusts the intermolecular connections that hold collagen networks together. Increasing or changing these connections can influence stiffness, structural stability, and degradation, while the selected modification determines how the network responds biologically. This makes crosslinking especially relevant when designing hydrogels or scaffolds whose physical persistence must match a particular regenerative, diagnostic, or therapeutic requirement.
A modification may be designed to retain collagen’s existing hierarchical organization or to intentionally alter it. Preserving that organization can maintain structural features important to the biomaterial, whereas changing intermolecular interactions can produce different network characteristics. This distinction allows engineers to balance the original protein architecture against newly required properties such as porosity, stability, or tunable stiffness.
These approaches act through different routes: chemical strategies alter collagen reactivity, enzymatic strategies modify the protein through biological catalysts, and genetic strategies change collagen at the level of its biological production. The overview supports treating them as complementary options rather than interchangeable steps. Their selection depends on whether the design priority is functional-group introduction, structural processing, or an altered collagen product.
Selection should begin with the required material and biological performance, then link that requirement to controllable features such as crosslinking, degradation, porosity, stiffness, or cell interaction. Engineers can choose modifications that preserve collagen organization when its structure is advantageous, or alter intermolecular interactions when a different network is needed. This property-driven approach supports more deliberate scaffold, hydrogel, and delivery-system design.
Modified collagen can support hydrogels, extracellular-matrix mimics, tissue scaffolds, and drug-delivery systems. In each format, chemical, enzymatic, or genetic changes provide ways to adjust the material rather than relying only on unmodified collagen behavior. The resulting designs can be tailored for combinations of stiffness, porosity, stability, degradation, and cell interactions suited to regenerative, diagnostic, or therapeutic applications.
Evaluation should focus on the properties the modification was intended to control: structural organization, reactivity, crosslinking, degradation, stiffness, porosity, stability, and cell interactions. These measurements connect molecular changes to the performance of the engineered material. Comparing those outcomes with the intended regenerative, diagnostic, or therapeutic requirement helps determine whether the modified collagen provides the needed biological and physical balance.