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Published on: March 14, 2016
An optical biosensor for kinetic analysis of soluble Interleukin-1 receptor I binding to immobilized
Bao-Yan Wu1, Yan-Yan Wang, Jing Li
1College of Life Sciences, Nankai University, Tianjin 300071, China.
Insights
This study developed a resonant mirror biosensor for analyzing Interleukin-1 receptor I (sIL-1R I) kinetics. The biosensor accurately measures sIL-1R I binding to Interleukin-1alpha (IL-1alpha), demonstrating its utility in real-time kinetic analysis.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Immunology
Background:
- Interleukin-1alpha (IL-1alpha) plays a crucial role in inflammatory responses.
- Soluble Interleukin-1 receptor I (sIL-1R I) acts as a natural antagonist to IL-1alpha.
- Accurate kinetic analysis of their interaction is vital for understanding inflammation.
Purpose of the Study:
- To develop and validate an optical biosensor for real-time kinetic analysis of sIL-1R I binding to immobilized IL-1alpha.
- To determine the binding affinity (K(D)) between sIL-1R I and IL-1alpha.
- To assess the reusability of the biosensor surface.
Main Methods:
- Development of a resonant mirror-based optical biosensor.
- Immobilization of IL-1alpha onto a carboxymethyl dextran (CMD) modified cuvette surface via amine groups.
- Real-time monitoring of sIL-1R I binding to immobilized IL-1alpha.
- Kinetic analysis using binding curves and Scatchard plot.
Main Results:
- The biosensor achieved a linear range for sIL-1R I detection from 100-1600nM (R=0.9962).
- The equilibrium dissociation constant (K(D)) for sIL-1R I binding to IL-1alpha was determined to be 2.6x10(-6)M.
- The sensing surface was successfully regenerated with 10mM HCl and reused multiple times.
Conclusions:
- The developed resonant mirror biosensor is effective for real-time kinetic analysis of sIL-1R I and IL-1alpha interactions.
- The biosensor provides accurate kinetic parameters and demonstrates surface reusability.
- This technology offers a valuable tool for studying IL-1 signaling pathways.
Abstract:
We report here the development of an optical biosensor based on the resonant mirror for kinetic analysis of soluble Interleukin-1 receptor I (sIL-1R I) in solution binding to immobilized Interleukin-1alpha (IL-1alpha). IL-1alpha was immobilized through its surface amine groups via amide bonds with the carboxyl groups of the carboxymethyl dextran (CMD) on cuvette surface. The interaction of sIL-1R I and IL-1alpha was monitored in real time. Evaluation of the binding curves allowed the analysis of the binding kinetics. The linear range of sIL-1R I in solution was over a range of 100-1600nM (R=0.9962). Equilibrium dissociation constant (K(D)) was derived by Scatchard plot analysis for sIL-1R I binding to immobilized IL-1alpha. For this assay, the K(D) was 2.6x10(-6)M. The CMD cuvette modified by IL-1alpha was successfully regenerated using 10mM HCl, and the same sensing surface was used repeatedly for the interaction analysis.
