Naive Pluripotent Stem Cell Culture Without MEK Inhibition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for culturing human pluripotent stem cells are laborious and inconsistent, with MEK inhibitor-based protocols leading to genetic instability and poor tolerance to passaging, hindering the realization of their potential in regenerative medicine.
Innovation Solution
Culturing pluripotent stem cells in the presence of Tankyrase, Protein Kinase C, Rho-Associated Protein kinase, and additional inhibitors such as RAF, FGFR1, or ERK inhibitors, without MEK inhibitors, to maintain and passage the cells, promoting naïve pluripotency and reducing genetic instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MEK inhibitor-based protocols are used to culture human pluripotent stem cells, then pluripotency maintenance is achieved, but genetic instability and poor tolerance to passaging occur
Solution Approach 1:
The patent removes MEK inhibitors from the culture protocol and replaces them with a combination of other inhibitors (PKC, ROCK, TNKS, and optionally RAF, FGFR1, or ERK inhibitors). This extraction of the harmful element (MEK inhibitor) while maintaining the functional outcome (pluripotency maintenance) directly resolves the contradiction between reliability and genetic stability.
Solution Approach 2:
The patent changes the chemical parameters of the culture medium by substituting MEK inhibitors with alternative inhibitor combinations. Specifically, it uses PKC inhibitors (e.g., Gö6983), ROCK inhibitors (e.g., Y-27632), TNKS inhibitors (e.g., XAV939), and optionally RAF inhibitors (e.g., AZ628), FGFR1 inhibitors (e.g., PD166866), or ERK inhibitors (e.g., GDC-0994) at optimized concentrations to achieve the same pluripotency maintenance without the harmful genetic effects.
2Reliability
If MEK inhibitor-based protocols are used to culture human pluripotent stem cells, then pluripotency maintenance is achieved, but laborious culture requirements and inconsistencies in developmental potential occur
Solution Approach 1:
The patent extracts MEK inhibitors from the culture protocol, which were responsible for the laborious and inconsistent culture requirements. The alternative inhibitor combination simplifies the culture process while improving consistency in developmental potential across different cell lines.
Solution Approach 2:
The patent optimizes culture parameters by using a defined combination of inhibitors with specific concentrations (e.g., PKC inhibitor at 100 nM, ROCK inhibitor at 10 μM, TNKS inhibitor at 1 μM) to achieve consistent and reproducible pluripotent stem cell maintenance across different experimental conditions and cell lines.
3Reliability
If conventional culture methods are used, then cell survival is maintained, but slow growth and poor tolerance to passaging as single cells occur
Solution Approach 1:
The patent changes the biochemical parameters of the culture medium by incorporating ROCK inhibitor (e.g., Y-27632 at 10 μM) which specifically improves single-cell passaging tolerance and growth rate. This parameter change enables faster colony formation and cell proliferation while maintaining high survival rates during passaging.
Solution Approach 2:
The patent applies ROCK inhibitor during the critical passaging step to pre-protect cells from stress before they are subjected to single-cell dissociation. This preliminary protective action enables cells to survive and proliferate more efficiently after passaging, resolving the contradiction between survival and growth rate.
Data Source
AI summary
The present disclosure provides methods and compositions for inducing, maintaining and/or passaging naïve pluripotent stem cell. In some embodiments, the methods are performed in the absence of MEK inhibition which has been shown to result in genomic instability of naïve pluripotent stem cells.