Mouse CTX-1 ELISA Kit (Colorimetric)

Sample reference curve

ELISA: Mouse CTX-1 ELISA Kit (Colorimetric) [NBP3-11802] - Samples were spiked with high concentrations of Mouse CTX-1 and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

ELISA: Mouse CTX-1 ELISA Kit (Colorimetric) [NBP3-11802] - Standard Curve Reference

• Reactivity: Mu
• Applications: ELISA
• Suitable Sample Type: Serum, plasma and other biological fluids
• Standard Curve Range: 31.25 - 2000 pg/mL
• Sensitivity: 18.75 pg/mL

Mouse CTX-1 ELISA Kit (Colorimetric) Summary

• Standard Curve Range: 31.25 - 2000 pg/mL
• Sensitivity: 18.75 pg/mL
• Assay Type: Sandwich-ELISA
• Inter-Assay: %CV < 5.73
• Intra-Assay: %CV < 5.45
• Spike Recovery: 86 - 108%
• Sample Volume: 100 uL
• Kit Type: ELISA Kit (Colorimetric)

Applications/Dilutions

• Dilutions:
  • ELISA

Packaging, Storage & Formulations

• Storage: Storage of components varies. See protocol for specific instructions.

Alternate Names for Mouse CTX-1 ELISA Kit (Colorimetric)

• Collagen Type 1 C-Telopeptide
• Cross Linked C-telopeptide of Type I Collagen
• CTX
• CTXI

Background

CTX-1, also referred to as either carboxy-terminal cross-linked telopeptide of type 1 collagen or C-terminal end of the telopeptide of type I collagen, is a marker of osteoporosis and bone resorption (1,2). CTX-1 is a common bone turnover marker (BTM) that can easily be measured in the plasma, serum, or urine (1-3). Bone turnover refers to the removal of old bones by resorption followed by generation of new bones (3). CTX-1 is released from intact collagen type 1 by cathepsin K cleavage and can be detected by an antibody against the eight amino acid sequence EKAHDGGR (2,4). Levels of CTX-1 show circadian rhythm variabilities altered by food intake, which makes timing of sample collection an important consideration and is typically done in a fasted state (1,3). Studies show that increased levels of CTX-1 along with bone-specific alkaline phosphatase (BSALP) is associated with increased risk for bone fractures and osteoporosis (3). The most common treatment for osteoporosis is bisphosphonates, which are classified as anti-resorptive drugs that slow the removal of bone (1,3). Another treatment is the Denosumab, a monoclonal antibody for receptor activator of NFkappaB ligand, which shows decreased levels of CTX-1 and other markers within the first 24-hours of treatment (1-3). Conversely, anabolic therapies add bone by focusing on the osteoclast and osteoblast populations. Romosozumab is one specific anabolic drug that showed quick decrease in CTX-1 levels following treatment (2,3).

References

1. Williams, C., & Sapra, A. (2020). Osteoporosis Markers. In StatPearls. StatPearls Publishing.

2. Szulc P. (2018). Bone turnover: Biology and assessment tools. Best Practice & Research. Clinical Endocrinology & Metabolism. https://doi.org/10.1016/j.beem.2018.05.003

3. Park, S. Y., Ahn, S. H., Yoo, J. I., Chung, Y. J., Jeon, Y. K., Yoon, B. H., Kim, H. Y., Lee, S. H., Lee, J., & Hong, S. (2019). Position Statement on the Use of Bone Turnover Markers for Osteoporosis Treatment. Journal of Bone Metabolism. https://doi.org/10.11005/jbm.2019.26.4.213

4. Cremers, C., Garnero, P., Seibel, M. J. (2008). Chapter 87- Biochemical Markers of Bone Metabolism. Principles of Bone Biology (Third Edition). https://doi.org/10.1016/B978-0-12-373884-4.00020-3.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. ELISA Kits are guaranteed for 6 months from date of receipt.