Wound healing is a complex process involving various cellular and molecular mechanisms. It is crucial for restoring tissue integrity and preventing infections. Over the years, researchers have explored various approaches to improve the wound healing process, including the use of biomaterials from natural sources. One such biomaterial is fish collagen, which has attracted attention because of its structure and its behaviour in laboratory models of wound healing and tissue repair.
Fish Collagen: What It Is and Where It Comes From
What is Fish Collagen?
Fish collagen, also known as marine collagen, is a structural protein extracted from the skin, scales, or bones of fish. Collagen is a main component of the scaffolding between cells (the extracellular matrix) in tissues such as skin, tendons and bones, and gives them strength and elasticity. Because of its structure, fish collagen is increasingly being researched as a material for wound dressings. That research works with collagen applied to the wound, not with collagen taken by mouth.
How Does Fish Collagen Differ from Mammalian Collagen?
Compared to collagen from mammals, fish collagen has a smaller molecular size. Fish collagen has a lower molecular weight than collagen from beef or pork – in other words, its molecules are smaller.
The Role of Essential Amino Acids
Fish collagen is rich in glycine, proline, and hydroxyproline – amino acids that are essential for the stability of the collagen structure. They are the amino acids collagen itself is built from, and collagen peptides supply them as raw material.
Sustainability and Environmental Friendliness
Another advantage: The extraction of fish collagen utilizes parts of the fish that would otherwise be considered waste, such as skin and scales. This makes the process not only sustainable but also reduces the ecological footprint compared to other animal collagen sources.
Lines of Research
Marine collagen has been studied as a wound-care material along several lines. Research has examined:
1. Cell Multiplication and Movement
Laboratory studies have examined how fish collagen behaves with fibroblasts, keratinocytes and endothelial cells – cell types involved in the wound healing process. These cells build the structural proteins of tissue, and collagen peptides supply the amino acids they use as raw material.
2. Inflammatory Response
Inflammation is a crucial stage in the wound healing process as it helps remove debris and pathogens from the wound site. However, excessive or prolonged inflammation can impede the healing process. In cell and animal experiments, markers of the inflammatory response were recorded after collagen material was applied directly to the wound. These measurements come from preclinical models and say nothing about taking collagen powder.
3. Collagen Formation
Collagen synthesis is a crucial step in wound healing as it provides the structural framework for tissue regeneration. Fibroblasts are the cells that build collagen, and collagen peptides supply the amino acids they use as raw material. In these preclinical models, collagen fibre deposition and tissue tensile strength were the measured variables.
4. Tests with Bacteria
Infections are a common complication in wounds and can significantly delay the healing process. In laboratory testing, marine collagen has been examined against various bacterial strains, including both gram-positive and gram-negative ones. These observations come from cell-culture and material experiments and do not transfer to collagen taken by mouth.
Research Evidence: What Has Been Measured
A number of scientific studies have examined fish collagen in the context of wound healing and tissue regeneration. In these in-vitro and in-vivo models, wound closure, scar formation and tissue structure were the variables recorded.
Lab Studies on Cells: Cell Multiplication and Movement
In an in-vitro study, the effect of fish collagen on the proliferation and migration of fibroblasts was investigated. Fibroblasts are the cells that build new connective tissue; for a wound to close, they have to multiply and move into the wound. This was measured in cell culture, with the collagen in direct contact with the cells.
Animal Studies: Wound Healing
In an animal study, the effect of fish collagen on wound healing in rats was investigated. Standard measures in such experiments are how quickly the wound closes, how much collagen is laid down in the new tissue and how tear-resistant it becomes. Together they describe how quickly and how firmly a wound heals.
Fish Collagen in Wound Research: What Was Measured
These models mainly recorded the following:
- Cell proliferation and migration: recorded as measured variables in cell models.
- Modulation of inflammatory response: Cytokine levels were recorded as a measured variable in cell models.
- Collagen synthesis: fibroblast collagen output was the measured variable in these models.
- Antimicrobial activity: bacterial growth was measured in cell-culture and material tests.
Commercial Applications of Fish Collagen in Wound Healing
Fish collagen is used not only in research but also in practice as a biomaterial for wound dressings. Various companies process fish collagen into medical devices applied in clinical settings; these are not food supplements.
Kerecis Omega3 Wound: Innovation from Fish Skin
The Icelandic company Kerecis has developed "Omega3 Wound," a product derived from Atlantic cod skin. A special process removes the cells from the fish skin. What remains is a natural framework rich in omega-3 fatty acids that is used as a wound dressing.
Clinical Studies on the Fish-Skin Matrix
In a study run at several clinics, complicated wounds were treated with the Omega3 Wound matrix.
Another study, published in the New England Journal of Medicine Evidence, investigated fish skin grafts in diabetic foot ulcers. To put this in context: both studies were about a graft placed on the wound in a clinic; they say nothing about collagen taken by mouth.
Applications and Availability
Kerecis products are used worldwide in the treatment of chronic wounds, burns, and other tissue damage. They are an alternative to conventional wound dressings.
Future Research
How marine collagen behaves as a wound material, and what it is suited for therapeutically, still needs further research. Future studies should clarify which components of fish collagen matter in wound models and refine its formulation and application.
Furthermore, additional clinical studies are needed to evaluate the efficacy and safety of fish collagen-based products in humans. Long-term follow-up studies are required to assess the durability of healing outcomes and potential side effects.
Conclusion
Fish collagen is being researched as a biomaterial for wound care. Laboratory work on it has looked at biocompatibility, cell proliferation and migration, markers of the inflammatory response and bacterial growth. Those measurements come from cell and animal models and describe a material applied to the wound.
Whether marine collagen proves itself in practice is something further research and clinical studies will have to show. With further advances in biomaterials and in growing tissue in the lab (tissue engineering), fish-collagen wound dressings could play a larger role in wound care in future.
Image credits: Diana Polekhina, FlyD, UX Indonesia, CDC on Unsplash