Peripheral Sensory Neuron Differentiation from Stem Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for differentiating human induced pluripotent stem cells (hiPSCs) into peripheral sensory neurons (PSNs) are inefficient, time-consuming, and prone to errors, with low yield and heterogeneity, limiting their application in drug discovery and cosmetic testing.
Innovation Solution
A method involving SMAD pathway inhibitors, mitogens, neurotrophic factors, and cell transduction inducers in specific culture conditions to differentiate hiPSCs into neural crest progenitor cells (NCPCs) and subsequently PSNs, using a 3N medium supplemented with polyornithine/laminin and conditioned medium from human epidermal keratinocytes, which reduces labor and increases reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods using murine stromal cells and co-culture are used to differentiate hiPSCs into PSNs, then neural differentiation is promoted, but cell type heterogeneity increases and differentiation yield decreases
Solution Approach 1:
The patent extracts and eliminates murine stromal cells from the culture system, using only human epidermal keratinocytes as feeder cells. This removal of heterogenous murine cells eliminates the source of cell type heterogeneity while maintaining neural differentiation through human cell-derived signals
Solution Approach 2:
The patent changes the cultural parameters by using defined media supplemented with specific growth factors (FGF-2, EGF, BDNF, GDNF, NGF, NT-3) and transitioning from serum-containing to serum-free conditions. This parameter optimization achieves homogeneous PSN differentiation without requiring murine stromal cells
2Reliability
If extended culture periods of 30 days or more are used to derive PSNs from hiPSCs, then neuronal maturation is achieved, but productivity decreases and time is consumed
Solution Approach 1:
The patent applies preliminary action by pre-treating hiPSCs with SMAD inhibitors (LDN-193189 and SB-431542) during days 0-10 to establish neural crest commitment before the main differentiation phase. This preliminary conditioning accelerates subsequent maturation, reducing total culture time from 30+ days to approximately 20-25 days while maintaining neuronal maturity
Solution Approach 2:
The patent maintains continuous useful action by using serum-free defined media with consistent growth factor supplementation throughout the entire differentiation process. This continuous provision of growth signals (FGF-2, EGF, BDNF, GDNF, NGF, NT-3) ensures uninterrupted neuronal maturation, eliminating the need for extended culture periods
3Reliability
If conventional differentiation protocols are used to generate PSNs, then differentiation can be achieved, but labor intensity increases and reproducibility decreases
Solution Approach 1:
The patent creates a universal differentiation protocol using a single human epidermal keratinocyte feeder cell line that can support PSN generation from multiple hiPSC sources. The standardized serum-free media formula with defined growth factors provides multi-functional support for neural induction, maintenance, and maturation, simplifying operations across different experiments
Solution Approach 2:
The patent implements self-service by using human epidermal keratinocytes as feeder cells that autonomously provide neurotrophic support and differentiation signals without requiring external murine stromal cell supplementation. The system self-regulates through keratinocyte-derived factors, eliminating the need for complex co-culture arrangements and improving reproducibility
Data Source
AI summary
The present invention relates to the field of stem cell biology, in particular the linage specific differentiation of pluripotent or multipotent stem cells. Specifically described are methods to direct the lineage specific differentiation of hiPSC to sensitive neurons or neuronal fibers innervating the human skin, such as neural crest stem cells (NCPCs) and here called peripheral sensory neurons (PSNs) using novel culture conditions. It is also described a method for screening a biological agent in vitro. The PSNs obtained using the methods of the present invention are further contemplated for various uses including, but limited to, use in in vitro tests or disease modelling, such as drug discovery assays, cell therapy on a higher scale, detecting a range of skin irritants and other compounds of interest, for studying skin aging mechanism, and for producing a dermocosmetic product. Also, it is contemplated the use of ligands in vitro for checking the differentiation and/or activation of the PSN cells, produced by the method of the invention, and the PSN cells, produced by the method of the invention.