Neural Plate Border Stem Cell Differentiation via Signaling Pathway Control
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Solution Overview
Problem
Current methods lack the ability to induce pluripotent stem cells to differentiate into early precursor cells capable of self-renewal and differentiation into both central nervous system (CNS) and peripheral nervous system (PNS) neurons, which are essential for disease modeling and drug discovery.
Innovation Solution
A method involving the differentiation of mammalian pluripotent stem cells using specific signaling pathways, including inhibition of activin/TGF-β and BMP pathways, and activation of canonical WNT and Hedgehog pathways, followed by expansion in a medium with WNT and Hedgehog activators and oxidation inhibitors, to produce neural plate border stem cells (NPBSCs) that can differentiate into CNS and PNS neurons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current differentiation methods are used on pluripotent stem cells, then some neural cell types can be produced, but the ability to generate early precursor cells capable of self-renewal and differentiation into both CNS and PNS neurons is lost
Solution Approach 1:
The patent applies parameter changes by systematically modifying signaling pathway activities (WNT activation, BMP inhibition, SHH activation, TGF-β inhibition) to transition pluripotent stem cells into NPBSCs that maintain both self-renewal and dual differentiation capacity. This involves changing the biochemical parameters of the culture medium to achieve the desired cell state.
Solution Approach 2:
The patent employs preliminary action by inducing neural plate border specification before committing to definitive neural lineage differentiation. This intermediate state allows cells to maintain self-renewal capacity while being primed for both CNS and PNS differentiation potentials.
2Productivity
If pluripotent stem cells are differentiated into specific neural lineages, then neuronal cell types are produced, but batch-to-batch variability increases and production cost increases
Solution Approach 1:
The patent replaces complex mechanical and manual differentiation protocols with a defined chemical signaling approach. By using specific small molecule inhibitors and activators of signaling pathways, the method achieves consistent results across batches without relying on variable mechanical manipulation or undefined serum components.
Solution Approach 2:
The patent uses precisely controlled concentrations of signaling pathway modulators (WNT activators, BMP inhibitors, SHH activators, TGF-β inhibitors) to standardize the differentiation process. This parameter-based control ensures reproducible generation of NPBSCs across different batches.
3Adaptability or versatility
If existing methods are used to produce neural precursor cells, then some neuronal types can be obtained, but the ability to model both CNS and PNS diseases is limited
Solution Approach 1:
The patent creates a universal NPBSC platform that can differentiate into both CNS and PNS neuronal types, enabling a single cell type to serve multiple disease modeling applications. This multi-functional approach replaces the need for separate differentiation protocols for different nervous system regions.
Solution Approach 2:
The patent segments the differentiation process into distinct phases: neural plate border specification, NPBSC expansion, and subsequent differentiation into CNS or PNS lineages. This segmented approach simplifies the overall complexity by breaking down the multi-lineage differentiation into manageable stages.
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
The method successfully generates NPBSCs that can robustly expand and differentiate into both CNS and PNS neurons, providing a valuable source for disease modeling and drug discovery applications with reduced batch-to-batch variability and cost.
Implementation Method 1
The neural tube and neural crest cell lineages are specified during gastrulation from the neural plate through a combination of WNT and bone morphogenetic protein (BMP) signals. Sonic hedgehog (SHH) signaling antagonizes the specification of neural crest cells by BMPs and WNT.
Implementation Method 2
culturing mammalian pluripotent stem cells in pluripotent stem cell medium for about 24 to about 96 hours, wherein the pluripotent stem cell medium comprises: (i) an inhibitor of the activin/TGF-β signalling pathway; (ii) an inhibitor of the BMP signalling pathway; (iii) an activator of the canonical WNT signalling pathway; and (iv) an activator of the Hedgehog signalling pathway
Implementation Method 3
an inhibitor of oxidation
Data Source
AI summary
The present invention relates to a method for producing mammalian neural plate border stem cells (NPBSCs), comprising: (a) differentiation of mammalian pluripotent stem cells by (a-i) culturing mammalian pluripotent stem cells in pluripotent stem cell medium for about 24 to about 96 hours, wherein the pluripotent stem cell medium comprises: (i) an inhibitor of the activin/TGF-β signalling pathway; (ii) an inhibitor of the BMP signalling pathway; (iii) an activator of the canonical WNT signalling pathway; and (iv) an activator of the Hedgehog signalling pathway; subsequently (a-ii) culturing the cells obtained in step (a-i) for about 24 to about 96 hours in a neural medium, wherein the neural medium comprises: (i) an inhibitor of the Activin/TGF-β signalling pathway; (ii) an inhibitor of the BMP signalling pathway; (iii) an activator of the canonical WNT signalling pathway; and (iv) an activator of the Hedgehog signalling pathway; subsequently (a-iii) culturing the cells obtained in step (a-ii) for about 24 to about 96 hours in a neural medium, wherein the neural medium comprises: (i) an activator of the canonical WNT signalling pathway; (ii) an activator of the Hedgehog signalling pathway; and (iii) an inhibitor of oxidation; and (b) plating the obtained differentiated mammalian pluripotent stem cells in NPBSCs expansion medium, wherein the NPBSCs expansion medium comprises (i) an activator of the canonical WNT signalling pathway; (ii) an activator of the Hedgehog signalling pathway; and (iii) an inhibitor of oxidation; and expanding the cells in the NPBSCs expansion medium for about 24 to about 96 hours; (c) splitting the cells obtained in (b) and further expanding the cells in the NPBSCs expansion medium; and (d) repeating step (c) at least two times. The present invention further relates to neural plate border stem cells obtainable by the method of the invention and the use of the cells of the invention in medicine.