Gradient Crosslinking Scaffold for Epithelial Monolayer Stability
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Solution Overview
Problem
Existing 3D organotypic culture systems for intestinal epithelial cells, such as organoids, face limitations in studying molecular transport due to their spheroidal architecture, which exposes the basal rather than luminal surface to exogenously added compounds, hindering the study of metabolite-sensing GPCRs and directional molecular transport systems.
Innovation Solution
A method is developed to create a scaffold with a gradient of crosslinking density by diffusing a crosslinker from one side, preserving the native surface properties while strengthening the scaffold from the opposite side, using materials like collagen hydrogel and crosslinkers like glutaraldehyde, to facilitate the formation of a gradient of crosslinking, stiffness, or porosity, and support a monolayer of epithelial cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If uniform crosslinking is applied throughout the scaffold, then mechanical strength is improved, but native surface properties are lost
Solution Approach 1:
The patent applies local quality by creating a gradient crosslinking structure where the scaffold has different crosslinking densities in different regions. The base layer has higher crosslinking density for mechanical strength, while the top surface maintains lower crosslinking density to preserve native properties for cell interaction.
Solution Approach 2:
The scaffold is segmented into distinct regions with different crosslinking characteristics. The method divides the scaffold structure into a crosslinked base portion and a less-crosslinked surface portion, allowing each region to fulfill its specific functional requirements independently.
2Stability of the object's composition
If crosslinking density is increased throughout the scaffold, then scaffold stability is improved, but cell migration and differentiation are inhibited
Solution Approach 1:
The gradient crosslinking structure provides local quality by creating regions with different mechanical and biochemical properties. The less-crosslinked surface region allows cell migration and differentiation while the highly crosslinked base provides structural stability.
3Strength
If scaffold crosslinking is strengthened, then structural integrity is improved, but contractility increases causing monolayer disruption
Solution Approach 1:
The scaffold is segmented into a crosslinked base layer that provides structural integrity and a less-crosslinked surface layer that minimizes contractility. This segmentation prevents the harmful effect of excessive contractility while maintaining the beneficial structural support.
Solution Approach 2:
By applying different crosslinking densities to different regions, the scaffold achieves local quality where the base provides strength and the surface provides a compliant environment suitable for cell monolayer maintenance.
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 allows for the formation of a continuous epithelial cell monolayer without contraction, enabling effective basal-to-apical and apical-to-basal transport studies, and sustaining the monolayer for extended periods, suitable for toxicological and physiological screening.
Implementation Method 1
contacting a cross-linking agent to one surface of the support for a time sufficient to generate a gradient of cross-linking of the polymer in the intermediate portion
Data Source
AI summary
The present invention is directed to a method of making a live cell construct or a support, comprising: (a) providing a non-cellular organic polymer support having a top surface, a bottom surface, and an intermediate portion there between, and (b) contacting a cross-linking agent to one surface of said support for a time sufficient to generate a gradient of cross-linking of said polymer in said intermediate portion. Also provided are live cell constructs, supports, and methods of use of the supports and live cell constructs.