Motor Unit Chip With Grooved Bilayer Hydrogels for NMJ Formation
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Solution Overview
Problem
Existing in vitro neuromuscular junction models are time-and effort-intensive and lack a generalized, functional model suitable for a wide spectrum of applications, particularly for studying motor units in neuromuscular disorders.
Innovation Solution
A motor unit chip comprising a first hydrogel with parallel micro grooves, a muscle cell within these grooves, and a second hydrogel with a motor neuron plated on top, utilizing gelatin and Matrigel or basement membrane-like matrix, and incorporating Schwann cells for myelination, to simulate a physiological microenvironment for motor unit development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing in vitro neuromuscular junction models are used, then functional NMJ formation can be achieved, but the process is time-and effort-intensive and lacks a generalized model for wide spectrum applications
Solution Approach 1:
The model system is segmented into distinct functional layers: a bottom hydrogel layer containing muscle fibers and a top hydrogel layer containing motor neurons and Schwann cells. This segmentation allows independent optimization of each layer's properties while maintaining overall functional integration, reducing the complexity of creating fully functional NMJ models.
Solution Approach 2:
The bilayer hydrogel system serves multiple functions simultaneously: it provides structural support, enables cell differentiation, facilitates neuromuscular junction formation, and allows for various applications including drug screening and disease modeling. This multi-functionality reduces the need for multiple separate models for different purposes.
2Reliability
If dissociated explants and primary cells are used to create NMJ models, then physiological relevance is improved, but the time required for model establishment increases
Solution Approach 1:
Muscle fibers and motor neurons are pre-plated in their respective hydrogel layers before the complete model assembly is finalized. This preliminary action allows parallel processing of different model components, reducing the overall time required while maintaining physiological relevance through the use of primary cells and dissociated explants.
Data Source
AI summary
The present disclosure provides a motor unit chip, a method for manufacturing the motor unit chip, and a method for detecting pathological event using the motor unit chip. The motor unit chip comprises a first hydrogel having parallel micro grooves on a surface; a muscle cell disposed in the parallel micro grooves; a second hydrogel disposed on the first hydrogel and covering the muscle cell; and a motor neuron plated on top of the second hydrogel. With the motor unit in a 3D structure, the motor unit chip of the present application makes detecting pathological event easier.