Apoptosis-Mimicking Scaffold Structures for Cell-Free Bone Regeneration
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Solution Overview
Problem
Existing tissue engineering scaffolds require the incorporation of cells to repair critical-sized bone defects, which can be challenging due to factors like cell origin, isolation, and manipulation outside the body.
Innovation Solution
Development of apoptosis-mimicking structures with a polymeric core and eat me signaling molecules that attract macrophages for phagocytosis, secreting chemokines to recruit endogenous stem/progenitor cells for bone regeneration without cell seeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cells are incorporated into scaffolding material to repair critical-sized bone defects, then bone regeneration is achieved, but cell manipulation complexity and potential unintended outcomes increase
Solution Approach 1:
The patent creates artificial apoptotic bodies that copy the essential signaling features of natural apoptotic cells without using actual cells. These synthetic structures contain phosphatidylserine molecules displayed on their surface to mimic the 'eat me' signals of apoptotic cells, thereby recruiting endogenous stem cells and macrophages to promote bone regeneration without the complexity of cell manipulation
Solution Approach 2:
The artificial apoptotic bodies serve as intermediary structures that mediate between the scaffolding material and the body's natural regenerative processes. They bridge the gap by providing external apoptotic signals that trigger endogenous stem cell recruitment and macrophage activation, eliminating the need for direct cell incorporation while maintaining reliable bone regeneration
2Reliability
If cells are incorporated into scaffolding material, then bone regeneration is promoted, but scaffold synthesis becomes more difficult
Solution Approach 1:
Instead of incorporating living cells which requires complex biomanufacturing processes, the patent copies the functional signaling molecules (phosphatidylserine) from apoptotic cells and displays them on synthetic particulate structures. This approach maintains bone regeneration effectiveness while dramatically simplifying scaffold synthesis to standard biomaterial fabrication processes
3Reliability
If cell incorporation is used for tissue repair, then critical-sized defects can be repaired, but factors like cell origin and isolation become challenging
Solution Approach 1:
The patent enables the body's own regenerative system to serve itself by providing artificial apoptotic bodies that trigger endogenous stem cell recruitment and macrophage activation. The scaffolding material itself provides the apoptotic signals needed to initiate the regenerative cascade, eliminating the need for external cell isolation, manipulation, and implantation procedures
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
Facilitates bone regeneration by simplifying scaffold synthesis and avoiding unintended outcomes associated with cell manipulation, enhancing osteoblastic function and tissue regeneration.
Implementation Method 1
a polymeric core including a polymer backbone that includes or is modified with a functional group to directly or indirectly bond to an eat me signaling molecule; and an eat me signaling molecule bonded directly or indirectly to the functional group
Implementation Method 2
eat me signaling molecules that attract macrophages for phagocytosis
Data Source
AI summary
An apoptosis-mimicking structure includes a polymeric core. The polymeric core includes a polymer backbone. The polymer backbone includes or is modified with a functional group to directly or indirectly bond to an eat me signaling molecule. An eat me signaling molecule is bonded directly or indirectly to the functional group. Other structures include a scaffold and the apoptosis-mimicking structure immobilized on or incorporated into the scaffold.