Cardiotoxicity Testing via Microelectrode Array Cell Resolution
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Solution Overview
Problem
Conventional bioassays face challenges in accurately measuring the response of cardiomyocytes to agents due to averaging of cell data and the inability to replicate natural multi-cellular tissue interactions, leading to inaccurate assessment of cardiotoxicity.
Innovation Solution
A cardiotoxicity testing apparatus and method that measures the fluctuation of field potential duration (FPD) and short-term variability (STV) of cardiomyocytes using a microelectrode array and optical system, allowing for precise evaluation of membrane potential and pulsation propagation in a cellular network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bioassays use a plurality of cultured cells to perform assays, then the average of cell population values can be measured, but the fluctuation of individual cell responses cannot be detected and information is lost
Solution Approach 1:
The invention segments the cell population measurement into individual cell-level measurements. By using a microelectrode array where each electrode contacts a single cardiomyocyte, the system divides the measurement task into discrete units, allowing individual cell responses to be recorded separately rather than averaged, thus preventing information loss while maintaining measurement precision
Solution Approach 2:
The invention transitions from population-averaged measurement to single-cell resolution measurement by adding the dimension of spatial arrangement. The microelectrode array provides a one-to-one correspondence between electrodes and cells, creating a dimensional mapping that preserves individual cell information while enabling parallel measurement across multiple cells
2Stability of the object's composition
If synchronized culturing is used to obtain cells in the same stage, then fluctuation of cell responses can be reduced, but continuous supply of such cells becomes difficult and application is limited
Solution Approach 1:
The invention replaces the mechanical/biological process of synchronized culturing with an electrical measurement approach. Instead of attempting to control and maintain synchronized cell states through complex culturing protocols, the system directly measures individual cell membrane potentials and action potentials, making the measurement independent of cell synchronization status and greatly enhancing method adaptability
3Reliability
If tissue fragments are used to perform bioassays, then physical contact and cell-to-cell interaction problems can be resolved, but the data varies and information is buried in the population
Solution Approach 1:
The invention applies local quality by allowing cells to maintain their natural tissue-like interactions locally while enabling precise individual measurement. The microelectrode array configuration allows each electrode to measure a specific cell's membrane potential while the cells remain in a confluent monolayer, preserving local cell-to-cell interactions without sacrificing measurement precision
Solution Approach 2:
The microelectrode array serves as an intermediary between the cell population and the measurement system. It translates complex population-level biological interactions into resolvable individual cell electrical signals, allowing both tissue-like interactions and precise measurement to coexist by mediating the information transfer from cells to measurement device
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
Enables accurate assessment of cardiotoxicity by quantitatively evaluating changes in cardiomyocyte responses to agents, providing a more reliable prediction of cardiac toxicity through the combination of FPD and STV measurements.
Implementation Method 1
measuring means for measuring a membrane potential of the cardiomyocyte by placing the microelectrode in contact with the cardiomyocyte
Implementation Method 2
an optical system, allowing for precise evaluation of membrane potential and pulsation propagation
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(c)
AI summary
In the present invention, a cardiomyocyte cluster is disposed on a transparent substrate, and the quality of the cardiomyocytes is evaluated from the response of the cells to a forced pulsation stimulus applied to the cardiomyocytes. The cardiomyocyte cluster is disposed on the transparent substrate, and is exposed to the flow of a liquid containing an agent in a manner so that the agent acts on the cells, which configure a network. The extent of cardiac toxicity resulting from the agent is evaluated from measuring the fluctuations obtained from a comparison of adjacent cardiomyocytes of the network.