Patch Graft Hydrogel for Solid Organ Cell Engraftment
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Solution Overview
Problem
Existing methods for transplanting cells into solid organs face challenges due to low efficiency, rapid cell aggregation leading to emboli, and inefficient engraftment, with most cells either dying or being transported to ectopic sites, resulting in adverse effects.
Innovation Solution
A novel patch graft composition and method involving grafting biomaterials that incorporate donor cells, such as epithelial and mesenchymal stem cells, with specific MMP expression, supported by a hydrogel matrix and biocompatible backing, allowing direct application to target sites to enhance engraftment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells are delivered via vascular channel or direct injection, then cells can be transported to target sites, but most cells die or are transported to ectopic sites resulting in low engraftment efficiency
Solution Approach 1:
The patent introduces a patch graft as an intermediary carrier that directly delivers cells to the target site. The patch graft serves as a mediator between the donor cells and the target organ, providing a controlled delivery mechanism that prevents ectopic transport and improves engraftment efficiency by placing cells in the correct location at the correct time.
Solution Approach 2:
The patch graft is prepared in advance with cells embedded in a biomaterial matrix before transplantation. This preliminary preparation ensures that cells are pre-positioned and protected, allowing for efficient engraftment upon application to the target site without requiring complex delivery systems or risking ectopic transport.
2Productivity
If cells are delivered vascularly, then cells can reach target sites, but rapid cell aggregation generates life-threatening emboli
Solution Approach 1:
The patch graft acts as an intermediary that prevents direct vascular injection of cells. By embedding cells in a biomaterial matrix and applying the patch directly to the target site, the system eliminates the harmful rapid aggregation and emboli formation that occurs with direct vascular delivery, while still achieving efficient cell delivery to the correct location.
3Productivity
If grafts are designed for internal organs, then cells can be transplanted into solid organs, but mechanical forces from tissue interactions challenge graft stability
Solution Approach 1:
The patent employs composite materials by combining donor cells with a biomaterial matrix to form the patch graft. This composite structure provides mechanical stability to withstand tissue interactions while maintaining biological functionality. The biomaterial matrix serves as a structural scaffold that protects cells and enables them to survive mechanical forces during and after transplantation.
Solution Approach 2:
The patch graft functions as a flexible thin film or shell that can be applied to the target site. This flexible structure allows the graft to accommodate mechanical forces from tissue interactions while maintaining cell integrity and graft stability. The thin film design enables the graft to conform to the target site geometry while providing sufficient mechanical support.
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
The method achieves rapid and efficient engraftment of donor cells into target organs, with significant integration within weeks, minimizing adverse effects and maximizing cell survival and functionality.
Implementation Method 1
supported in a medium present in a hydrogel matrix having a viscoelasticity sufficient to allow for migration of said mixed population
Implementation Method 2
a hydrogel matrix having a viscoelasticity sufficient to allow for migration of said mixed population
Data Source
AI summary
Compositions and methods of transplanting cells by grafting strategies into solid organs (especially internal organs) are provided. These methods and compositions can be used to repair diseased organs or to establish models of disease states in experimental hosts. The method involves attachment onto the surface of a tissue or organ, a patch graft, a “bandaid-like” covering, containing epithelial cells with supporting early lineage stage mesenchymal cells. The cells are incorporated into soft gel-forming biomaterials prepared under serum-free, defined conditions comprised of nutrients, lipids, vitamins, and regulatory signals that collectively support stemness of the donor cells. The graft is covered with a biodegradable, biocompatible, bioresorbable backing used to affix the graft to the target site. The cells in the graft migrate into and throughout the tissue such that within a couple of weeks they are uniformly dispersed within the recipient (host) tissue. The mechanisms by which engraftment and integration of donor cells into the organ or tissue involve multiple membrane-associated and secreted forms of MMPs.