Novel Biomedical Applications of Crosslinked Collagen

Multiple crosslinking techniques have been developed to optimize the properties of fibrillar collagen for different biotechnological applications. Treatments based on modulating crosslinks within the collagen matrix of damaged tissues have received excellent clinic results for treating diseases such as keratoconus. Crosslinked collagen-based scaffolds have been extensively studied for tissue engineering to promote tissue regeneration or repair. Nanoparticles act as crosslinking agents for collagen stabilization as well as functionalized carriers for crosslinking to collagen scaffolds for novel biomolecular applications. Collagen is one of the most useful biopolymers because of its low immunogenicity and biocompatibility. The biomedical potential of natural collagen is limited by its poor mechanical strength, thermal stability, and enzyme resistance, but exogenous chemical, physical, or biological crosslinks have been used to modify the molecular structure of collagen to minimize degradation and enhance mechanical stability. Although crosslinked collagen-based materials have been widely used in biomedicine, there is no standard crosslinking protocol that can achieve a perfect balance between stability and functional remodeling of collagen. Understanding the role of crosslinking agents in the modification of collagen performance and their potential biomedical applications are crucial for developing novel collagen-based biopolymers for therapeutic gain. Collagen is one of the most useful biopolymers because of its low immunogenicity and biocompatibility. The biomedical potential of natural collagen is limited by its poor mechanical strength, thermal stability, and enzyme resistance, but exogenous chemical, physical, or biological crosslinks have been used to modify the molecular structure of collagen to minimize degradation and enhance mechanical stability. Although crosslinked collagen-based materials have been widely used in biomedicine, there is no standard crosslinking protocol that can achieve a perfect balance between stability and functional remodeling of collagen. Understanding the role of crosslinking agents in the modification of collagen performance and their potential biomedical applications are crucial for developing novel collagen-based biopolymers for therapeutic gain. a substance made of living cells that is used for 3D printing of complex tissue models. Bioinks are materials that mimic an extracellular matrix environment to support the adhesion, proliferation, and differentiation of living cells. They are different from traditional hydrogels, polymer networks, and foam scaffolds because of their ability to be deposited as filaments during an additive manufacturing process. Unlike traditional additive manufacturing materials such as thermoplastic polymers, ceramics, and metals, which require the use of harsh solvents, crosslinking modalities, and high temperatures to be printed, bioinks are processed under much milder conditions. These mild conditions are necessary to preserve compatibility with living cells and prevent degradation of bioactive molecules and macroscopical proteins. automated generation of biologically functional products with structural organization from living cells, bioactive molecules, biomaterials, cell aggregates, or hybrid cell-material constructs, through bioprinting or bioassembly and subsequent tissue maturation processes. Bioprinting is a technique which produces 2D or 3D organization by using computer-aided patterning and assembly of living and non-living materials. Bioassembly relies on automated assembly of preformed cell-containing fabrication units generated via cell-driven self-organization or through preparation of hybrid cell-material building blocks. progressive thinning of the cornea that is associated with alterations of the stromal collagen matrix, resulting in irregular protrusion of the cornea. Primary forms include keratoconus, pellucid marginal degeneration, and keratoglobus, while secondary forms are mainly related to refractive surgery. As a kind of corneal ectasia, keratoconus is caused by local collagen matrix weakness, where tissue bulging occurs under ocular pressure. induction of chemical or physical links among biopolymer chains of the substance or between exogenous molecules and biopolymers. While the former is still a homogeneous system after crosslinking, the latter is rendered a composite system by incorporating exogenous molecules. This technique is often used to modify the properties of proteins, including collagen. the interface between dentin, the predominant hard tissue in a tooth, and the tooth filling that is placed over the dentin. The hybrid layer consists of a collagen network that is exposed by acid or acidic resin monomers by partial or complete removal of carbonated apatite, the inorganic component of dentin. The collagen network is subsequently infiltration by adhesive resin monomers which polymerize in situ, thereby connecting the plastic tooth filling material to the tooth. The hybrid layer is the most vulnerable portion of the bonded interfaces where stress tends to concentrate and most failures occur. a branch of medicine that promotes regeneration/repair of diseased or damaged organs by devising replacements that seamlessly interact with the living body, providing elements required for in vivo repair and stimulating the body’s intrinsic capacities to regenerate, instead of directly replacing what is malfunctioning. the characteristic feature of different types of fibrillar collagen, comprising three left-handed polyproline-type helices twisted into a right-handed superhelix and stabilized by hydrogen bonding and van der Waals attractions between the imino residues on different chains within the triple helix.