Hydroxyproline Assay Kit (DEIA-XY2132)

Regulatory status: For research use only, not for use in diagnostic procedures.

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tissue specimens, tissue homogenates
Species Reactivity
Intended Use
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


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Effects of rabbit pinna-derived blastema cells on tendon healing


Authors: Ghayemi, Nooshin; Sarrafzadeh-Rezaei, Farshid; Malekinejad, Hassan; Behfar, Mehdi; Farshid, Amir-Abbas

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.

Animal Models for Studying Stone Disease


Authors: Chen, Szu-Ju; Chiu, Kun-Yuan; Chen, Huey-Yi; Lin, Wei-Yong; Chen, Yung-Hsiang; Chen, Wen-Chi

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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