Planar Intestinal Crypts with Distinct Substrate Regions
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Solution Overview
Problem
Current in vitro culture systems for intestinal tissues fail to recapitulate the in vivo microenvironment and cell compartmentalization, making it difficult to assay or image, especially in high throughput assays, due to their three-dimensional nature and inability to effectively separate biochemical cues for proliferation and differentiation.
Innovation Solution
A method and apparatus for producing tissue constructs with two or more distinct regions on a flat surface, using a support substrate with physically distinct regions of different porosity, permeability, or stiffness, where cells convert to different populations in response to these properties, and can be exposed to various stimuli to study their effects on cell growth and differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-dimensional intestinal organoid cultures are used, then cell compartmentalization and microenvironment are better preserved, but the ability to assay and image cells in high throughput is reduced
Solution Approach 1:
The patent transitions from three-dimensional organoid cultures to two-dimensional planar tissue constructs. By flattening the tissue architecture while preserving cellular compartmentalization through specialized substrate designs (such as micropatterned surfaces and controlled stiffness gradients), the invention enables high-throughput imaging and assaying while maintaining physiological relevance of cell organization
2Ease of manufacture
If uniform support substrates are used, then manufacturing is simplified, but the ability to create distinct cell populations with different physical cues is reduced
Solution Approach 1:
The patent implements substrates with spatially varying physical properties including stiffness gradients, porosity variations, and micropatterned topographies. These local variations in substrate characteristics guide cells to differentiate into specific populations in different regions, creating physiologically relevant tissue zones while maintaining a relatively simple overall manufacturing process
Solution Approach 2:
The invention employs composite substrate structures combining multiple materials with different mechanical and physical properties. By integrating materials with varying stiffness, porosity, and biochemical functionality into a single substrate system, the patent achieves complex cell differentiation patterns without requiring multiple separate substrates
Data Source
AI summary
A method for producing tissue constructs comprising two or more distinct regions, each of which comprises a different cell population or lineage is described. The method involves providing a support substrate or substrate assembly comprising two or more physically distinct regions, wherein the two or more physically distinct regions of the support substrate or substrate assembly are different from each other; and depositing/positioning one or more cells on the support substrate or substrate assembly. The cells can form a continuous monolayer with at least two zones, e.g., a proliferative zone and a nonproliferative zone, that can act as in vitro intestinal models. The models are two-dimensional, thus facilitating rapid and facile imaging. Systems comprising the tissue constructs and methods of using the constructs to study the effects of pharmaceuticals, nutraceuticals, and metabolites on intestinal cells are also described.