3D Microfluidic NVU-on-a-Chip Simulating Blood-Brain Barrier
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Solution Overview
Problem
Current 2D cell culture models inadequately simulate the complex spatial structure and biochemical interactions of brain cells, leading to incomplete simulation of the neurovascular unit (NVU) and blood-brain barrier (BBB), which limits the efficacy of drug testing and predictability for brain diseases.
Innovation Solution
A 3D microfluidic chip (NVU-on-a-chip) that co-cultures multiple types of human brain cells in a microfluidic platform with an extracellular matrix simulation material, mimicking the BBB by forming a brain microvessel endothelial cell lining and allowing direct contact between cells, while minimizing substrate-channel interactions to prevent drug absorption issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a 2D cell culture model is used to culture brain cells, then the culture process is simple and easy to operate, but the spatial structure and biochemical complexity of living cells cannot be simulated accurately
Solution Approach 1:
The patent transitions from 2D cell culture to 3D cell culture by stacking multiple PDMS layers (first, second, and third layers) to create a three-dimensional microfluidic environment. This dimensional change enables cells to be cultured in multiple layers with vertical stacking, accurately simulating the spatial structure and biochemical complexity of living brain tissue while maintaining microfluidic control for media perfusion.
2Measurement precision
If a neurovascular microfluidic bioreactor with multiple PDMS layers is used to simulate BBB, then the BBB structure can be formed, but the complete NVU including all cell types cannot be sufficiently implemented
Solution Approach 1:
The patent divides the NVU into functionally distinct segments located in different microfluidic compartments: endothelial cells forming BBB in the first PDMS layer, pericytes in the second PDMS layer, and neurons/astrocytes in the third PDMS layer. This segmentation allows each cell type to be cultured in its optimal environment while maintaining physiological interactions through the microfluidic system, achieving complete NVU implementation without excessive complexity.
Solution Approach 2:
The patent implements a nested structure where the second PDMS layer with pericytes is positioned between the first PDMS layer (endothelial cells) and the third PDMS layer (neurons and astrocytes). This nesting arrangement allows multiple cell types to be integrated in a compact three-dimensional configuration, with each layer contributing to the complete NVU structure while maintaining spatial organization.
3Ease of manufacture
If endothelial cells are cultured 2D on the membrane surface, then the culture is easy to perform, but the BBB in vivo structure and function cannot be sufficiently implemented
Solution Approach 1:
The patent transitions endothelial cells from 2D culture on the membrane surface to 3D culture within microfluidic channels. The endothelial cells are perfused through the first PDMS layer and form a continuous lining along the channel, creating a three-dimensional vascular structure that better mimics in vivo BBB architecture and improves functional reliability for drug testing.
Data Source
AI summary
Provided are a neurovascular unit (NVU)-on-a-chip and a method of fabricating the same, which 3-dimensionally integrates various human brain cells in a microfluidic platform by using a brain cell co-culture technique so as to simulate a similar environment to the human brain in vitro. The NVU-on-a-chip includes an extracellular matrix (ECM) simulation material (70) in a gel state; and at least one channel (75) which passes through the ECM simulation material (70) and perfuses a culture medium, in which the ECM simulation material (70) contains a plurality of types of human brain cells on an outer side of the channel (75), a brain microvessel endothelial cell lining (91) is formed on an inner side of the channel (75), and the plurality of types of human brain cells and the brain microvessel endothelial cell lining (91) contact each other through the channel (75) to simulate a blood brain barrier (BBB) of a human brain and a neurovascular unit (NVU) of the human brain including the BBB.