Bone-Targeting Peptide Coatings for Osteoinduction
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Solution Overview
Problem
Demineralized bone matrix (DBM) has a limited ability to induce osteoinduction, which restricts its use as an effective alternative for bone repair and implants due to its low osteoinductive properties.
Innovation Solution
A coating composition comprising a peptide with binding specificity for bone, coupled to a pharmaceutically active agent, which includes a peptide sequence rich in aromatic amino acids and lacks the collagen sequence Gly-Ile-Ala, is applied to bone implants or surfaces to enhance osteoinduction, osteoconduction, and osteogenesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If demineralized bone matrix (DBM) is used as bone implant material, then it provides structural support and osteoconduction, but it has low osteoinductive ability
Solution Approach 1:
The patent combines DBM with synthetic peptides having specific amino acid sequences (rich in aromatic amino acids like phenylalanine, tryptophan, and tyrosine) to create a composite material. This composite enhances the osteoinductive properties of DBM while maintaining its structural support and osteoconductive capabilities, directly addressing the low osteoinductive ability limitation.
Solution Approach 2:
The patent modifies the chemical composition parameters of DBM by incorporating specific peptide sequences with defined amino acid compositions. These parameter changes (adding specific aromatic amino acid motifs) transform the material's biological properties to enhance osteoinduction while preserving other essential functions.
2Reliability
If conventional bone implant materials are used, then they provide mechanical strength, but they lack enhanced osteoinductive and osteogenic properties
Solution Approach 1:
The invention creates a composite system where peptides with specific binding domains are integrated with bone implant materials. This composite approach enables the material to simultaneously provide mechanical strength (from the implant matrix) and enhanced osteoinductive/osteogenic properties (from the peptide components), resolving the contradiction between strength and biological activity.
Solution Approach 2:
The peptide-based coating or implant material is designed to perform multiple functions: providing mechanical support, enabling osteoconduction, inducing osteogenesis, and promoting osteoinduction. This multi-functionality allows a single material system to address both mechanical strength requirements and enhanced biological properties without compromise.
3Reliability
If peptide sequences rich in aromatic amino acids are used, then binding specificity for bone is enhanced, but the peptide structure becomes more complex
Solution Approach 1:
The patent applies local quality by concentrating aromatic amino acid residues (phenylalanine, tryptophan, tyrosine) at specific locations within the peptide sequence, particularly in the N-terminal region. This localized arrangement of specific amino acids provides bone binding specificity without requiring the entire peptide structure to be complex, thus achieving high affinity with controlled complexity.
Solution Approach 2:
The peptide is segmented into functional domains: an N-terminal region rich in aromatic amino acids for bone binding, and a C-terminal region for pharmaceutically active agent binding. This segmentation allows each domain to be optimized independently, achieving specific binding functions without unnecessary overall complexity.
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 peptide-based coating composition effectively targets and localizes pharmaceutically active agents to bone, promoting enhanced bone growth and repair by improving osteoinductive, osteoconductive, and osteogenic processes.
Implementation Method 1
The at least one binding domain that binds specifically to bone comprises a peptide... having binding specificity for bone
Implementation Method 2
at least one binding domain that binds specifically to a pharmaceutically active agent... having binding specificity for a pharmaceutically active agent
Data Source
AI summary
Compositions are provided comprising a family of peptides having binding specificity for bone, and their use to produce coating compositions. The coating compositions are used to deliver a pharmaceutically active agent to bone, and are used in methods related to bone implants, bone repair, and bone-related diseases.