Perfusable Microvessel Networks for Angiogenesis Observation
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Solution Overview
Problem
Current models for studying angiogenesis, both in vivo and in vitro, face limitations such as opacity of tissues, difficulty in observing vascular growth in real-time, and inability to replicate the dynamic nature of vascular growth, particularly in 3D environments, which hampers the understanding of angiogenic processes and their regulation.
Innovation Solution
A method for creating perfusable microvessel networks in vitro by seeding cells into a channel within a matrix, activating them for sprouting, and maintaining viability through luminal perfusion, allowing for the study of angiogenesis with angiogenesis-modulatory compounds and evaluation of various experimental parameters like hypoxia and bioactive compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional histology methods are used to study angiogenesis, then tissue structure can be examined, but real-time dynamic observation of vascular growth is impossible due to tissue opacity and the static nature of fixed sections
Solution Approach 1:
The patent creates an in vitro model that copies the essential features of in vivo angiogenesis (endothelial cell sprouting, vascular tube formation, and network development) in a transparent, accessible environment. This allows real-time observation of dynamic processes that cannot be captured in opaque tissues, while maintaining the biological relevance of angiogenic sprouting and vessel maturation.
2Ease of operation
If 2D monolayer cultures of endothelial cells are used, then cell behavior can be studied, but the 3D architecture and invasive sprouting characteristic of true angiogenesis cannot be replicated
Solution Approach 1:
The patent transitions from 2D monolayer culture to 3D angiogenic sprouting by embedding endothelial cells in extracellular matrix gels and providing luminal perfusion. This dimensional change enables cells to form invasive tubular structures that grow into the matrix, replicating the 3D architecture of in vivo blood vessels while maintaining experimental controllability.
3Device complexity
If static culture models are used, then experimental control is maintained, but vessel stability and maturation are compromised without luminal flow
Solution Approach 1:
The patent introduces luminal perfusion through the endothelial cell-formed vessels, applying hydraulic flow to stabilize and mature the vascular structures. The continuous fluid flow through the lumens reinforces vessel walls, promotes proper endothelial cell alignment, and enhances overall vessel stability, mimicking physiological blood flow conditions.
4Reliability
If in vivo models are used to study angiogenesis, then physiological relevance is achieved, but costs, animal welfare concerns, and surgical complexities increase significantly
Solution Approach 1:
The patent creates an intermediary in vitro system that bridges the gap between simple 2D cultures and complex in vivo models. By using extracellular matrix gels, luminal perfusion, and endothelial cell sprouting, the model achieves physiological relevance for studying angiogenesis mechanisms while avoiding the complexities and ethical concerns of animal experimentation.
Data Source
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.