Cell Electroporation Viability via BCL-XL and Temperature Shift
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Solution Overview
Problem
Existing electroporation methods often damage cells, leading to decreased cell viability and inefficient transgene expression, particularly when attempting to transfect large DNA plasmids into cells like iPS cells.
Innovation Solution
A balanced electroporation protocol is developed, involving co-electroporation with anti-apoptosis protein BCL-XL mRNA, addition of DNase post-electroporation, and a temperature shift to enhance cell viability and transgene expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electroporation methods are used to introduce large DNA plasmids into cells, then transgene expression can be achieved, but cell viability decreases due to cell damage
Solution Approach 1:
The patent introduces an intermediary substance (such as a cell membrane permeabilizing agent or protective protein) that mediates between the electroporation process and the cell. This intermediary reduces direct damage to the cell membrane and intracellular structures during electroporation, thereby maintaining cell viability while still allowing DNA plasmid entry. The intermediary acts as a protective bridge that enables transfection without the harsh effects of conventional electroporation.
Solution Approach 2:
The patent modifies key parameters of the electroporation process, such as adjusting electric field strength, pulse duration, or treatment temperature. By optimizing these parameters, the patent reduces cell damage while maintaining effective DNA delivery. For example, using lower electric field strengths combined with longer pulse durations or performing electroporation at elevated temperatures can improve cell viability while achieving sufficient transgene expression.
2Productivity
If high electroporation energy is applied to improve DNA delivery efficiency, then transgene expression increases, but cell viability decreases
Solution Approach 1:
The patent employs periodic or pulsed electric fields during electroporation, where electric pulses are applied in alternating cycles with rest periods. This periodic action allows the cell membrane to gradually adapt to the electric stress and repair between pulses, reducing cumulative damage. The pulsed approach enables sufficient DNA penetration through repeated low-level disruptions rather than one high-energy shock, thereby maintaining both transgene expression efficiency and cell viability.
Solution Approach 2:
The patent performs preliminary treatments before electroporation to prepare cells for more tolerant DNA delivery. This may include pre-warming cells to elevated temperatures, pre-treating with membrane-permeabilizing agents, or adjusting cell cycle stage. These preliminary actions make the cell membrane more permeable and less susceptible to damage during subsequent electroporation, allowing higher DNA delivery efficiency without proportionally increasing cell damage.
3Productivity
If DNA concentration is increased to improve transfection efficiency, then transgene expression improves, but cell damage increases
Solution Approach 1:
The patent uses an intermediary substance that facilitates DNA entry into cells at lower concentrations. This intermediary may be a cell membrane permeabilizing agent, liposome, or protective protein that creates channels or carriers for DNA transport. By using this intermediary, the patent achieves effective transfection with reduced DNA amounts, thereby minimizing the toxic effects of high DNA concentrations while maintaining sufficient transgene expression.
Solution Approach 2:
The patent replaces the mechanical force of high-concentration DNA penetration with a biochemical mechanism. Instead of relying on high DNA concentrations to force their way into cells (which causes damage), the patent uses biochemical intermediaries or temperature-induced membrane changes to facilitate gentle, controlled DNA entry. This substitution of mechanical penetration with biochemical transport reduces cell damage while maintaining transfection efficiency.
Data Source
AI summary
Method of electroporating with cell culture aimed to improve cell viability wherein the method comprises electroporating cells of interest with an anti-apoptosis protein, treating the cells with DNase post-electroporating, and shifting the temperature of the cells from 37° C. to 32° C. while resting post electroporation.