Growth Factor Anchoring Bone Graft via Collagen-Binding Peptide
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Solution Overview
Problem
Current bone graft materials face challenges in maintaining the retention of bone growth factors at the application site, achieving early bone union, and providing anatomical shape and mechanical strength, particularly in cases of artificial joint revision surgery and fracture treatment.
Innovation Solution
A growth factor anchoring type bone graft material is developed by binding a collagen-binding-site-containing growth factor, comprising a growth factor receptor agonist peptide and a collagen-binding peptide, to a bone graft substrate exposing collagen fibers, allowing for easy mixing without cross-linking reactions, thereby enhancing osteogenic ability and retention at the application site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bone graft materials are used, then anatomical shape and mechanical strength are maintained, but retention of bone growth factors at the application site is poor
Solution Approach 1:
A collagen-binding peptide acts as an intermediary between the bone growth factor and the bone graft substrate. The peptide contains a collagen-binding domain that specifically binds to collagen fibers in the substrate, while also binding to the growth factor, thereby mediating the attachment and improving retention without requiring complex cross-linking reactions
Solution Approach 2:
The invention creates a composite material system consisting of three components: the bone graft substrate (providing structural support), the collagen-binding peptide (providing binding functionality), and the bone growth factor (providing biological activity). This composite structure allows each component to fulfill its specific function while working together to achieve improved growth factor retention
2Reliability
If cross-linking reactions are used to fix growth factors, then retention is improved, but manufacturing complexity increases
Solution Approach 1:
The collagen-binding peptide functions as a temporary, easily replaceable binding agent that does not require permanent chemical modification of the substrate. The peptide can be simply mixed with the substrate and growth factor, forming a functional complex without needing durable cross-linking, thereby simplifying the manufacturing process
Solution Approach 2:
The invention changes the binding mechanism from covalent cross-linking (strong, permanent bonds requiring complex chemistry) to non-covalent peptide-collagen interactions (weaker, reversible bonds achieved through simple mixing). This parameter change in binding strength and chemistry complexity enables easier manufacturing while maintaining adequate retention
3Reliability
If autologous bone grafting is performed, then safety is high, but pain and recovery period increase
Solution Approach 1:
The collagen-binding peptide serves as a mediator that enables the use of allogeneic or synthetic bone substrates to achieve outcomes comparable to autologous grafting. By improving growth factor retention on these alternative substrates, the peptide allows patients to avoid the pain and recovery time associated with harvesting autologous bone while maintaining high safety through the use of purified, controlled substances
4Reliability
If growth factor concentration is increased, then osteogenic ability is improved, but retention at application site decreases due to body fluid circulation
Solution Approach 1:
The collagen-binding peptide acts as a local retention intermediary that captures growth factors at the application site through binding to collagen in the substrate. This local anchoring prevents systemic circulation and loss of the growth factor, allowing effective osteogenic concentrations to be maintained locally without rapid clearance by body fluids
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 growth factor anchoring type bone graft material exhibits superior osteogenic ability, facilitating early bone union and maintaining anatomical shape and mechanical strength, with improved retention of growth factors, making it suitable for challenging bone grafting procedures.
Implementation Method 1
a collagen-binding peptide (CBD)... binds to a collagen fiber
Data Source
AI summary
Provided is a growth factor anchoring type bone graft material, wherein a bone graft substrate exposing at least a collagen fiber is bound to a collagen-binding-site-containing growth factor which contains a growth factor receptor agonist peptide and a collagen-binding peptide. The same can be produced by mixing a bone graft substrate and a collagen-binding-site-containing growth factor which contains a growth factor receptor agonist peptide and a collagen-binding peptide, and is also superior in osteogenic ability.