Skin Appendage-Inducible Cells via Transcription Factor Reprogramming

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Solution Overview

Problem

Current methods are inadequate for efficiently regenerating skin appendages such as hair follicles and sebaceous glands, as they require grafting from fetal or neonatal skin and struggle to achieve sufficient regeneration in a short period, and there is no direct conversion method for skin appendage-inducible cells from skin appendage-uninducible somatic cells.

Innovation Solution

The production of skin appendage-inducible cells by transfecting genes like LEF1, DNP63A, GRHL2, TFAP2A, and SHH into adipose tissue-derived mesenchymal cells, which are then transplanted into an immunodeficient animal to regenerate hair follicles and sebaceous glands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fetal or neonatal skin cells are transplanted to regenerate skin appendages, then skin appendage regeneration is achieved, but the treatment period is extended and the complexity of cell source acquisition increases

Engineering Contradiction:

Improveskin appendage regenerationVSAvoidtreatment period

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention changes the key parameter of cell differentiation state by introducing specific transcription factors (LEF1, DNP63A, GRHL2, TFAP2A, SHH) to convert fully differentiated somatic cells into induced skin appendage-inducible cells. This parameter change enables the cells to regain developmental potential and form skin appendages, resolving the contradiction by providing a reliable regeneration method using readily available adult somatic cells rather than time-constrained fetal or neonatal cells

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention performs preliminary action by pre-differentiating somatic cells into induced skin appendage-inducible cells through transfection with specific genes before transplantation. This preliminary differentiation step prepares the cells in advance to possess the necessary developmental capabilities, eliminating the need to use fetal or neonatal cells and reducing the overall treatment time

Inventive Principle:

Principle #10Preliminary action

2Reliability

If conventional skin grafting methods are used, then skin appendages are regenerated, but the procedural complexity and surgical intervention requirements increase

Engineering Contradiction:

Improveskin appendage regenerationVSAvoidsurgical procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts the essential function of skin appendage formation from complex surgical procedures by isolating and introducing specific transcription factor genes (LEF1, DNP63A, GRHL2, TFAP2A, SHH) that control skin appendage development. This extraction simplifies the overall treatment by replacing complex grafting surgeries with a targeted genetic intervention approach followed by simple cell transplantation

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical surgical intervention of skin grafting with a biological approach using gene transfection and induced cell differentiation. Instead of mechanically transferring tissue flaps or grafts, the method uses molecular biology techniques to reprogram cell fate, substituting mechanical complexity with biochemical precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If direct conversion of skin appendage-inducible cells from somatic cells is attempted, then the cell source availability improves, but the technical feasibility was previously unestablished

Engineering Contradiction:

Improvecell source availabilityVSAvoidconversion method feasibility

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention segments the complex process of skin appendage formation into distinct molecular components by identifying and introducing five specific transcription factors (LEF1, DNP63A, GRHL2, TFAP2A, SHH) that individually and collectively control different aspects of skin appendage development. This segmentation makes the previously infeasible direct conversion possible by breaking down the complex differentiation pathway into manageable genetic elements

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite cellular product by combining multiple transcription factors within somatic cells to generate induced skin appendage-inducible cells. This composite approach, integrating five different genetic elements, achieves the desired cell type conversion that none of the individual factors could accomplish alone, thereby establishing feasible direct conversion from somatic cells

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20240368555A1Cells having ability to induce skin appendages, and production method thereof

Publication Date: 2024.11.07 KURITA MASAKAZU

AI summary

[Problem] To directly convert somatic cells into cells that have an ability to form a stratified epithelial tissue capable of acting as the body outer skin and also have an ability to induce skin appendages.[Solution] A production method of cells that have an ability to induce skin appendages, said method comprising a step for introducing into somatic cells at least one gene that is relatively strongly expressed in cells having the ability to induce skin appendages.