3D Bioprinted Cerebral Cortical Organoid Chip for Long-Term Culture
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Solution Overview
Problem
Existing organ-on-a-chip technologies face challenges in constructing human cerebral cortical organoids due to complex structures, difficulty in medium renewal, accumulation of toxic substances, and inability to support long-term culture, particularly for soft tissues like the human cerebral cortex, which requires a specific living environment.
Innovation Solution
A human cerebral cortical organoid chip with a three-layer structure, comprising a mixed-flow channel layer, liquid pool layer, microporous array layer, and culture medium recovery layer, allows for in situ 3D bioprinting of human cerebral cortical organoids using a bioink composed of alginate, gelatin, and hyaluronic acid, with a culture medium recovery system to simulate cerebrospinal fluid circulation and support neural cell survival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex organ chip structure is used to culture biological tissue, then tissue cultivation capability is improved, but device complexity increases and practical application becomes difficult
Solution Approach 1:
The chip is divided into five functional layers: mixed-flow channel layer, liquid pool layer, microporous array layer, culture layer, and recovery layer. Each layer performs a specific function, allowing the complex cultivation system to be modularized and easier to manufacture while maintaining tissue cultivation capability.
Solution Approach 2:
The culture medium renewal function is extracted and implemented through a dedicated recovery layer with microporous arrays that enable medium exchange without requiring complex external intervention, simplifying the overall system operation.
2Duration of action of moving object
If traditional organ chip structure is used, then initial culture is possible, but medium renewal is difficult and toxic substances accumulate
Solution Approach 1:
The recovery layer with microporous arrays enables the system to automatically renew culture medium and remove toxic substances through passive diffusion and flow, without requiring frequent manual intervention, thus extending culture duration while maintaining ease of operation.
Solution Approach 2:
The chip design includes a recovery layer that continuously removes used culture medium and accumulates toxic substances, replacing them with fresh medium, thereby extending the viable culture period and maintaining operational simplicity.
3Ease of manufacture
If existing printing methods are used, then general tissue printing is possible, but soft tissue like cerebral cortex cannot be printed
Solution Approach 1:
A specialized bioink formulation with optimized rheological parameters is developed, containing specific concentrations of gelatin, hyaluronic acid, and alginate, allowing the printing system to successfully deposit and maintain soft cerebral cortical tissue structures that previous methods could not handle.
Solution Approach 2:
The bioink is formulated as a composite material combining gelatin, hyaluronic acid, and alginate, providing the necessary mechanical properties, biocompatibility, and printability for soft cerebral cortical tissue, enabling manufacturing capability for previously unprintable soft tissues.
4Manufacturing precision
If bioink with good comprehensive properties is used, then printing quality improves, but formulation becomes difficult for cerebral cortical organoids
Solution Approach 1:
The bioink formulation parameters are optimized to specific values: gelatin 2-5% (w/v), hyaluronic acid 0.1-0.5% (w/v), and alginate 1-3% (w/v), with crosslinking agents at controlled concentrations, achieving printing precision suitable for cerebral cortical organoids while maintaining a relatively simple formulation process.
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 chip enables the direct printing of human cerebral cortical organoids with adjustable elastic modulus and porosity, facilitating long-term culture and drug screening, while maintaining neural cell viability and functionality.
Implementation Method 1
the mixed-flow channel mixes the different components of culture medium evenly
Implementation Method 2
the microporous array layer is used for allowing the medium to pass slowly
Implementation Method 3
a 3D bioprinter is used for constructing 3D bioprinting tissue-like
Implementation Method 4
the drive system is used for driving the medium to flow in the organ chip
Data Source
AI summary
A method of rapid constructing human cerebral cortical organoids by 3D bioprinting and an application including preparing microfluidic chips, preparation of hydrogel of human cerebral cortical organoids, and printing of human cerebral cortical organoids. The microfluidic chip comprises a mixed-flow channel layer, liquid pool layer, microporous array layer, human cerebral cortical organoid culture layer, and culture medium recovery layer; the human cerebral cortical organoid hydrogel has gelatin, alginate, and hyaluronic acid; printing directly human cerebral cortical organoids in microfluidic chips by FRESH printing method, obtaining human cerebral cortical organoid chips after packaging. The application directly constructs large-scale human cerebral cortex-like with three layers of mutually connected structures in situ in organ chip through 3D bioprinting, simulates cerebrospinal fluid circulation through perfusion culture.