TSH Receptor Autoantibody Measurement via cAMP Biosensor Cells
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Solution Overview
Problem
Existing methods for measuring TSH receptor autoantibody activity are time-consuming and require pretreatment or medium adaptation steps, limiting their efficiency and accuracy in diagnosing thyroid diseases like Basedow's disease.
Innovation Solution
A method involving incubation of mammal cells expressing a cAMP biosensor and TSH receptor with a blood sample, followed by measuring the activation level of the cAMP biosensor to determine autoantibody activity, eliminating the need for pretreatment and medium adaptation, and completing the process within 3 hours using commercially available equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bioassay methods using CHO cells or swine thyroid cells are used to measure TSAb activity, then measurement accuracy can be maintained, but the total measurement time becomes excessively long (44 hours or more for CHO cells, 5-6 hours for swine thyroid cells)
Solution Approach 1:
The patent introduces a cAMP biosensor as an intermediary component that translates the biological interaction between TSAb and TSH receptor into a rapidly detectable light signal. This biosensor mediator enables the measurement to be completed in 3 hours or less while maintaining accuracy, resolving the contradiction between measurement precision and time consumption
Solution Approach 2:
The patent replaces the conventional mechanical/cellular assay system (requiring cell proliferation and long incubation) with a biochemical sensing system based on cAMP detection and light emission. This substitution eliminates the need for lengthy cell culture steps while preserving the ability to accurately measure autoantibody activity
2Measurement precision
If CHO cells are used for TSAb measurement with confluent monolayer formation, then background value is reduced for better precision, but the requirement for 24-hour cell proliferation and 16-hour medium adaptation extends measurement time to 44 hours or more
Solution Approach 1:
The patent performs preliminary actions by pre-expressing both the TSH receptor and cAMP biosensor in the mammal cells before the actual measurement. This preparation is done once during cell line development, allowing subsequent measurements to be completed rapidly without requiring repeated cell proliferation or medium adaptation steps
Solution Approach 2:
The patent changes the fundamental parameters of the measurement system by switching from conventional cAMP detection methods to a light-emission-based biosensor system. This parameter change enables rapid detection without the time-consuming steps of cell confluency formation and medium adaptation
3Loss of time
If swine thyroid cells are used for rapid TSAb measurement, then measurement time is reduced to 5-6 hours, but endogenous cAMP in serum requires pretreatment with active carbon and measurement precision is compromised
Solution Approach 1:
The cAMP biosensor acts as a selective intermediary that specifically detects cAMP produced by TSH receptor activation in response to TSAb. This biosensor-mediated detection system distinguishes between endogenous and stimulus-induced cAMP, eliminating the need for active carbon pretreatment and preserving measurement precision
Solution Approach 2:
The patent replaces the chemical pretreatment method (active carbon adsorption) with a biological sensing method using cAMP biosensor. This substitution allows direct measurement of serum samples without pretreatment, maintaining both speed and precision
4Loss of time
If light emission-mediated cAMP detection systems are used, then measurement time is shortened to approximately 4 hours, but pretreatment steps are still required and measurement accuracy for thyrotoxic ophthalmopathy determination remains uncertain
Solution Approach 1:
The mammal cells expressing the TSH receptor and cAMP biosensor perform the detection function autonomously without requiring external pretreatment of the serum sample. The cells themselves provide the necessary detection capability, eliminating the need for separate pretreatment steps and simplifying the overall操作流程
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method allows for rapid and accurate determination of TSH receptor autoantibody activity, reducing false negatives and enabling precise differentiation between Basedow's disease patients and healthy individuals, facilitating timely and appropriate treatment decisions.
Implementation Method 1
a bioassay system of detecting signals of cAMP, etc. by light emission mediated by calcium ions
Data Source
AI summary
Provided herein is a method and kit that accurately measure autoantibody activity against a TSH receptor without pretreating a blood sample. The autoantibody activity against a TSH receptor in a blood sample is measured by using a kit for measurement of autoantibody activity against a TSH receptor in a mammal cell, comprising a mammal cell expressing both a cAMP biosensor and the TSH receptor, and a substrate capable of visualizing and/or quantifying the CAMP biosensor as constituents, and performing the steps of: (a) incubating a mammal cell expressing both a cAMP biosensor and the TSH receptor in the presence of a blood sample collected from a test subject; (b) measuring an activation level of the CAMP biosensor after the step (a); and (c) comparing the activation level measured in the step (b) with an activation level in a control to calculate the autoantibody activity.