Pulse Electric Current for Beta Myosin Heavy Chain Production
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Solution Overview
Problem
Current methods for producing β myosin heavy chain in cardiac muscle cells differentiated from induced pluripotent stem cells derived from Homo sapiens are inefficient, with existing techniques failing to achieve optimal production levels.
Innovation Solution
A method involving a substrate with insulative fibers oriented at specific angles between electrodes, where a liquid culture medium with cardiac muscle cells is applied and a pulse electric current is applied to the cells, enhancing the production of β myosin heavy chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional cell culture methods are used without oriented insulative fibers, then the device structure is simple, but the production ratio of β myosin heavy chain is low
Solution Approach 1:
The substrate is segmented into multiple functional components: electrodes for electrical stimulation, insulative fibers for mechanical orientation guidance, and culture medium for nutrient supply. This segmentation allows each component to independently contribute to cell differentiation and protein production, resolving the contradiction by enabling high productivity through structured complexity rather than monolithic design
Solution Approach 2:
Insulative fibers serve as an intermediary element between electrodes and cardiac muscle cells. These fibers provide mechanical orientation cues to cells while maintaining electrical insulation, thereby mediating the interaction between electrical stimulation and cell behavior. This intermediary role enables the substrate structure to enhance β myosin heavy chain production without requiring direct electrical contact between electrodes and cells, managing the complexity-productivity trade-off
2Productivity
If insulative fibers are oriented at specific angles (±20 degrees) between electrodes, then the production ratio of β myosin heavy chain increases to 57.9%, but the manufacturing precision requirement increases
Solution Approach 1:
The patent specifies a parameter range (±20 degrees) for fiber orientation angles rather than requiring exact precision. This parameter change approach transforms the manufacturing requirement from high-precision angular control to a broader acceptable range, thereby achieving high β myosin heavy chain production (57.9%) without excessively stringent manufacturing precision requirements
Solution Approach 2:
The insulative fibers exhibit local quality variation in their orientation, with different regions potentially having fibers at slightly different angles within the ±20 degree range. This local quality approach allows the system to maintain high overall productivity while accommodating natural variations in fiber alignment during manufacturing, reducing the burden of uniform precision across the entire substrate
3Productivity
If pulse electric current is applied through electrodes, then the production of β myosin heavy chain is enhanced, but the energy consumption increases
Solution Approach 1:
Pulse electric current is applied in periodic intervals rather than continuously to the cardiac muscle cells on the substrate. This periodic stimulation enhances β myosin heavy chain production by mimicking natural cardiac electrical activity patterns, while reducing overall energy consumption compared to continuous current application. The pulsed nature of the stimulation maintains productivity benefits while managing energy usage
Data Source
AI summary
The present invention provides a method for producing a β myosin heavy chain in cardiac muscle cells differentiated from induced pluripotent stem cells derived from Homo sapiens. In the present method, first, a liquid culture medium containing the cardiac muscle cells is supplied onto a substrate comprising a first electrode, a second electrode and insulative fibers on the surface thereof. At least a part of the insulative fibers is located between the first electrode and the second electrode in a top view of the substrate. Then, the substrate is left at rest. Finally, the cardiac muscle cells are cultivated, while a pulse electric current is applied to the cardiac muscle cells through the first electrode and the second electrode.