Cell Pluripotency Maintenance via Membrane Potential Regulation

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Solution Overview

Problem

Current methods fail to effectively maintain pluripotency in cells, particularly during embryonic development, as they do not adequately control the exit from pluripotency factors, which is crucial for cellular differentiation and tissue formation.

Innovation Solution

The method involves reducing the membrane potential of cells by subjecting them to high potassium ion concentrations, inhibiting potassium channels, or using potassium selective ionophores, and activating voltage-gated calcium channels to increase calcium ion concentrations, thereby maintaining pluripotency in stem cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cells are subjected to conventional culture conditions, then cellular differentiation is activated, but pluripotency is lost

Engineering Contradiction:

Improvepluripotency maintenanceVSAvoidcellular state

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by modifying the extracellular potassium ion concentration from conventional levels (approximately 5.9 mM) to elevated levels (10-80 mM). This parameter change depolarizes the membrane potential, preventing the activation of voltage-gated calcium channels and subsequent calcium signaling cascades that would otherwise trigger differentiation. The change in ionic parameter directly maintains pluripotency by altering the electrophysiological state of the cell.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs preliminary anti-action by pre-depolarizing the membrane potential through elevated extracellular potassium concentrations before differentiation signals can take effect. This preemptive depolarization blocks the activation of voltage-gated calcium channels, thereby preventing the calcium-dependent signaling pathways that lead to pluripotency exit. The anti-differentiation effect is established before the differentiation process can initiate.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If membrane potential is reduced to maintain pluripotency, then pluripotency is maintained, but cellular differentiation is inhibited

Engineering Contradiction:

Improvepluripotency maintenanceVSAvoiddifferentiation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies dynamics by enabling reversible control of membrane potential and cellular state. By dynamically adjusting extracellular potassium concentration, the system can switch between maintaining pluripotency (high K+, depolarized state) and allowing differentiation (low K+, hyperpolarized state). This dynamic control allows the same cell population to be toggled between undifferentiated and differentiated states based on cultivation conditions, providing temporal and conditional regulation of cell fate.

Inventive Principle:

Principle #15Dynamics

3Reliability

If potassium channels are inhibited to depolarize membrane, then pluripotency is maintained, but channel function is blocked

Engineering Contradiction:

Improvepluripotency maintenanceVSAvoidchannel inhibition side effects

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent uses elevated extracellular potassium ions as an intermediary mechanism to achieve membrane depolarization without directly inhibiting potassium channels. Instead of blocking channel function with inhibitors (which may have off-target effects), the high extracellular potassium concentration passively depolarizes the membrane by reducing the potassium gradient, thereby maintaining pluripotency through a non-inhibitory, physiologically gentler mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This approach effectively maintains pluripotency in stem cells by regulating membrane potential and calcium levels, allowing for controlled differentiation and tissue formation, as demonstrated in both Xenopus embryos and human embryonic stem cells.

Implementation Method 1

reducing the membrane potential of the cell comprises subjecting the cell to an extracellular environment having a high concentration of potassium ions

Methodology Applied

Scientific EffectIon gradient:

Implementation Method 2

contacting the cell with a potassium selective ionophore

Methodology Applied

Scientific EffectIonophore:

Implementation Method 3

inhibiting a potassium channel on the plasma membrane of the cell

Methodology Applied

Scientific EffectIon channel inhibition:

Implementation Method 4

activating a voltage gated calcium channel on the plasma membrane of the cell; increasing the calcium ion concentration in the cell

Methodology Applied

Scientific EffectVoltage-gated channel activation:

Data Source

PatentUS20240018470A1Method of manipulating pluripotency in cells

Publication Date: 2024.01.18 YALE UNIVERSITY

AI summary

Described herein is a method of maintaining pluripotency in a cell. The method includes in one aspect reducing a membrane potential of the cell. Also described herein is a culture medium for performing certain aspects of the method, as well as a composition in which the pluripotency of a cell is maintained by the culture medium.