Collagen is the major structural protein of the extracellular matrix in many tissues. Hydroxyproline, a major component of collagen, comprises around 13.5% of its amino acid composition. Due to its highly restricted distribution in collagen, the hydroxyproline content accurately reflects the amount of collagen in the sample. Therefore, quantitating hydroxyproline has been utilized for evaluating tissue fibrosis or collagen deposition (1, 2, 3). However, classic hydroxyproline assays are not useful since it requires cumbersome procedures and special tools. This hydroxyproline assay kit employs an improved assay system that can be operated with ease and precision using 96-well plates. This kit works for quantitation of total collagen of any type and species in tissue specimens and tissue homogenates.
Contents of Kit
1. Hydroxyproline Standard: 1 vial, 4 mg/ml x 0.5 ml 2. 10X Chloramine T Concentrate: 1 vial, 1 ml 3. 2X DMAB (dimethylaminobenzaldehyde) Concentrate: 1 vial, 5 ml 4. Solution A- Chloramine T Dilution Buffer: 1 bottle, 10 ml 5. Solution B - DMAB Dilution Buffer: 1 vial, 5 ml 6. ELISA Plate: 1 each, 8-well strips x 12
Storage
-20°C
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Background
As a hydroxylated proline derivative, hydroxyproline (Hyp) is found in many proteins, although it is most prevalent in collagen. It is created during the translation and modification processes of proteins. The main structural protein that makes up connective tissue in the body is collagen, which is present in skin, bone, and muscle tissues. It takes hydroxyproline metabolism to sustain regular physiological processes. Proline is normally hydroxylated in the endoplasmic reticulum, where certain enzymes facilitate it. Trans-4-hydroxy-L-proline and trans-3-hydroxy-L-proline, two isomeric forms of hydroxyproline, contribute to collagen's triple-helical shape, which maintains the protein's strength and structural stability in tissues. Because of its function, hydroxyproline is a necessary component of collagen.
The importance of hydroxyproline in basic science and medicine cannot be overstated. Numerous illnesses, such as osteoporosis, rheumatoid arthritis, atherosclerosis, aortic aneurysms, and problems of the vitreous humor, are linked to abnormalities in the structure or function of collagen. As a result, hydroxyproline is a useful biomarker for determining the effectiveness of therapies and for creating new therapeutic strategies for various illnesses. Furthermore, hydroxyproline helps to maintain the structure and function of collagen in the skin, which is helpful in the treatment of diseases like systemic lupus erythematosus and in delaying the aging process of the skin. Hydroxyproline is a scaffold protein or substance used in regenerative medicine to create artificial tissues for tissue regeneration.
Hydroxyproline has potential uses in agriculture in addition to medicine. It strengthens soil structure, retains more water in the soil, and raises soil fertility as a soil conditioner. Hydroxyproline is a nutrient that improves drought resistance, growth stimulation, oxidative stress protection, and general plant health when administered to plants. When added to feed, hydroxyproline helps preserve the health of cattle in animal husbandry by lowering intestinal inflammation and preserving skin, bones, and joints. Enhancing the hardness and texture of shrimp, fish, and shellfish flesh with hydroxyproline addition in fishmeal can enhance product quality and market value in aquaculture.
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References
Effects of rabbit pinna-derived blastema cells on tendon healing
Objective(s): Tendon healing is substantially slow and often associated with suboptimal repair. Cell therapy is one of the promising methods to improve tendon repair. Blastema, a population of undifferentiated cells, represents characteristics of pluripotent mesenchymal stem cells and has the potentials to be used in regenerative medicine. The aim of this study was to investigate the use of blastema allotransplantation in rabbit tendon healing. Materials and Methods: In this study, one rabbit was used as a blastema donor, and twenty-four rabbits were divided into control and treatment groups. Blastema cells were obtained from ear pinna upon punch hole injury in the donor rabbit. Under general anesthesia, a complete transverse tenotomy was performed on the midsubstance of deep digital flexor tendon followed by suture-repair. In the treatment group, 1 x 10(6) blastema cells suspended in buffer saline were injected intratendinously at the repair site, while the control group received only the buffer saline. Cast coaptation was maintained for two weeks. Eight weeks after the operation, tendons were harvested, and histopathological, biomechanical, and biochemical assays were performed on samples. Results: Mechanical testing showed a significant increase in ultimate load, energy absorption, stiffness, yield load, stress, and strain in blastema-treated tendons compared to controls. Also, higher hydroxyproline content and improved collagen alignment along with lower inflammatory cell infiltration and decreased angiogenesis were observed in blastema-treated tendons. Conclusion: Increased levels of hydroxyproline and improved histopathological and biomechanical parameters in the treatment group suggest that blastema cells could be considered an adjunct to tendon repair in rabbits.
Animals have stone disease too. There are several animal models for the research of human stone disease. Rodents are the most frequently used for stone research, although they are not prone to forming crystals in the kidneys. Ethylene glycol (EG), sodium oxalate andl-hydroxyproline are common lithogenic agents. Dogs and pigs were also reported as a study animal for stone disease. However, the breeding costs and body size are too high. The most-used genetic study animal for stone disease was the mouse, but it was high-cost. Calcium oxalate (CaOx) crystals can also be light microscopically observed in the Malphigian tubules ofDrosophila melanogaster, induced by adding EG to the food. Genetic studies of flies can be done by cross-breeding, and this has a lower cost than using mice. The fly model also has several advantages, including minimal breeding equipment, the fact that it is easier to reach larger numbers in a short time with flies, that crystals can be observed under microscopy, and that they allow genetic study. We suggest the fly will be an ideal animal model for stone research in the future.
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