Post-Print Peptide Functionalization of PPF Scaffolds
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Solution Overview
Problem
Traditional 3D printing methods are inhospitable to peptides and drugs, making it difficult to incorporate biologics into tissue scaffolds, and existing methods for immobilizing bioactive peptides on scaffolds are not effective for improving cell attachment and differentiation in tissue engineering.
Innovation Solution
The development of bioactive peptide-loaded poly(propylene fumarate) (PPF) tissue scaffolds formed through 3D printing, where bioactive peptides with thiol functional groups react with exposed alkene groups on the PPF polymer matrix via a thiol-ene 'click' reaction, tethering them to the scaffold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional photochemical 3D printing methods are used to fabricate tissue scaffolds, then the scaffolds can be produced with complex geometries and controlled porosity, but the light and heat intensive process damages peptides, proteins and drugs making it impossible to incorporate biologics during printing
Solution Approach 1:
The process is divided into two separate stages: (1) fabricate the PPF scaffold structure using photochemical 3D printing without biologics, and (2) subsequently load the fabricated scaffold with bioactive peptides through thiol-ene click chemistry. This segmentation allows each stage to be optimized independently, avoiding the conflict between light-intensive printing and peptide sensitivity.
Solution Approach 2:
The scaffold structure is prepared in advance with exposed alkene functional groups on its surface through photochemical polymerization. This preliminary action creates a reactive surface that can subsequently bind peptides under mild conditions, separating the structure formation (requiring light/heat) from the biologics incorporation (requiring gentle conditions).
2Reliability
If physical adsorption or encapsulation methods are used to load bioactive peptides onto scaffolds, then the process is simple and gentle for peptides, but the binding is not strong enough to effectively improve cell attachment and differentiation
Solution Approach 1:
The weak physical adsorption mechanism is replaced with covalent chemical bonding through thiol-ene click chemistry. The thiol groups on peptides form strong covalent bonds with alkene groups on the PPF scaffold surface, providing reliable and durable attachment that effectively improves cell attachment and differentiation outcomes.
Solution Approach 2:
The bonding mechanism is changed from physical (weak, reversible) to chemical (strong, covalent). The thiol-ene click reaction creates stable covalent bonds between peptides and the scaffold, fundamentally changing the binding strength parameter to achieve effective cell attachment and differentiation.
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
This method allows for the effective loading and binding of bioactive peptides to the scaffolds, enhancing cell attachment, proliferation, and differentiation, particularly useful for repairing bone defects.
Implementation Method 1
The thiol groups on the bioactive peptides or other compound will react with exposed alkene groups on the PPF polymer matrix via a thiol-ene 'click' reaction, thereby binding the These bioactive peptide or other compound to the tissue scaffolds
Implementation Method 2
forming a poly(propylene fumarate) polymer structure or matrix from the 3-D printable resin using 3-D printing technology
Data Source
AI summary
In various aspects, the present invention is directed to novel bioactive peptide loaded poly(propylene fumarate) (PPF) tissue scaffolds and related methods for their making and use. In various embodiments, these bioactive peptide loaded poly(propylene fumarate) tissue scaffolds are formed by forming a PPF structure or matrix using photochemical 3-D printing techniques and then loading that printed PPF structure or matrix with a bioactive peptides or other bioactive compounds that have, or have been functionalized to have, a thiol functional group at or near its terminus. The thiol groups on the bioactive peptides or other compound will react with exposed alkene functional groups on the PPF polymer matrix via a thiol-ene “click” reaction, thereby binding these bioactive peptides or other compounds to the tissue scaffolds. The bioactive peptide loaded PPF tissue scaffolds of the present invention are particularly useful in repairing bone defects.