Perfusable Microvessel Networks via Mandrel-Based 3D Culture
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Solution Overview
Problem
Current models for studying angiogenesis, particularly in vitro, fail to replicate the complex dynamics of vascular growth and luminal flow, lacking key characteristics such as invasion, directionality, correct polarity, lumen formation, and cell specificity, and do not allow for the study of the contribution of luminal pressure and flow to vascular growth and morphogenesis.
Innovation Solution
A method for forming perfusable microvessels in vitro by seeding endothelial cells into a matrix around a mandrel, removing the mandrel to create channels, and perfusing with medium to form parent vessels that sprout into the surrounding matrix, allowing for the study of angiogenesis with luminal flow and the evaluation of angiogenic and angiostatic factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional 2D monolayer cultures of endothelial cells are used, then cell culture is simple and cost-effective, but the model fails to replicate true angiogenesis characteristics including invasion, directionality, correct polarity, and lumen formation
Solution Approach 1:
The patent transitions from conventional 2D monolayer cultures to a 3D culture system where endothelial cells are embedded in a collagen matrix and form tubular structures with lumens. This dimensional change enables the cells to exhibit true angiogenic behaviors including invasion into the matrix, directional growth, correct polarity with luminal surfaces facing the lumen, and formation of patent lumens filled with perfusate medium.
2Difficulty of detecting and measuring
If in vivo models with viewing chambers are used, then real-time observation of angiogenesis is possible, but the models are complex, expensive, and involve animal surgeries
Solution Approach 1:
The patent creates a simplified in vitro copy of the in vivo angiogenesis process. By culturing endothelial cells in a 3D collagen matrix that mimics the extracellular matrix environment, the system reproduces key angiogenic features (invasion, sprouting, lumen formation) without requiring complex animal models or surgical viewing chambers, enabling real-time observation in a controlled laboratory setting.
3Reliability
If existing 3D models of angiogenesis are used, then some characteristics of vascular growth are replicated, but luminal flow and pressure effects cannot be studied
Solution Approach 1:
The patent creates a multi-functional system that not only replicates angiogenic characteristics (invasion, sprouting, network formation) but also enables luminal perfusion. The formed vessels can be perfused with medium to simulate blood flow, allowing simultaneous study of both structural development and hemodynamic effects on vascular growth and morphogenesis.
4Shape
If mandrels are used to create channels in the matrix, then defined vascular structures are formed, but the process requires additional steps for mandrel removal
Solution Approach 1:
The patent incorporates mandrels into the collagen matrix before cell seeding and culture. The mandrels serve as temporary scaffolds that define the vascular lumen space during vessel formation. After the endothelial cells have formed complete tubular structures around the mandrels, the mandrels are removed (by extraction or decomposition), leaving behind well-defined patent lumens. This preliminary placement of mandrels simplifies the overall process by providing pre-formed geometric guides for vessel formation.
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
This approach enables the creation of stable, perfusable microvessel networks that mimic in vivo vascular growth, allowing for the study of vascular development and response to various factors, including hypoxia and bioactive compounds, and can be used to develop fully functional vascular systems for tissue engineering.
Implementation Method 1
removing the mandrel to create a channel within the matrix, wherein the mandrel is removed by extraction or by decomposing
Implementation Method 2
perfusing the at least one channel with at least one perfusate medium to allow the cells to form at least one parent vessel; incubating and perfusing the at least one parent vessel with at least one perfusate medium to maintain viability and provide for sprouting
Data Source
Figure 1A~1C
Figure 2A~2D
Figure 3A~3B
AI summary
A method for creating networks of perfusable microvessels in vitro. Cells including cell types capable of sprouting are seeded 1300 into a channel in a matrix at to activate competency 1304 of the cells for sprouting as microvessels based on the seeding density. The matrix channel is perfused with medium to allow parent vessels to form and for viability 1324. The parent vessels and matrix are incubated and perfused to provide for sprouting of microvessels from parent vessels into the surrounding matrix 1328. The sprouting parent vessels are grown until network forms 1332.