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Bicyclic RGD peptides enhance nerve growth in synthetic PEG-based Anisogels
Sitara Vedaraman1, Dominik Bernhagen2, Tamas Haraszti1
1DWI Leibniz Institute for Interactive Materials, Forckenbeckstrasse 50, 52074 Aachen, Germany and Institute for Technical and Macromolecular Chemistry, RWTH Aachen, Worringerweg 1-2, 52074 Aachen, Germany. delaporte@dwi.rwth-aachen.de.
New bicyclic peptides improve nerve regeneration scaffolds. These Arg-Gly-Asp (RGD) peptides offer enhanced integrin selectivity and stability in poly(ethylene glycol) (PEG) hydrogels, promoting superior nerve cell growth and oriented outgrowth.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Nerve regeneration scaffolds utilize hydrogels with extracellular matrix (ECM) components.
- Linear Arg-Gly-Asp (RGD) peptides are common but lack stability and selectivity.
- Cyclic RGD peptides improve affinity but not selectivity for integrin subtypes.
Purpose of the Study:
- Investigate novel bicyclic peptides with RGD for enhanced cell growth in 3D synthetic hydrogels.
- Develop artificial extracellular matrix (aECM) hydrogels with improved integrin affinity and selectivity.
- Evaluate the impact of degradable crosslinkers on cell migration and proliferation.
Main Methods:
- Synthesized and conjugated bicyclic peptides to poly(ethylene glycol) (PEG)-based Anisogels.
- Incorporated proteolytic cleavable moieties for controlled degradation.
- Tested hydrogels with mouse fibroblasts and primary nerve cells from embryonic chick dorsal root ganglions (DRGs).
- Utilized magneto-responsive fibers for oriented nerve cell outgrowth.
Main Results:
- Bicyclic RGD peptides demonstrated high integrin selectivity for αvβ3 or α5β1 subunits.
- PEG hydrogels with bicyclic RGD peptides supported superior growth of fibroblasts and DRG neurons compared to linear/cyclic RGD.
- αvβ3 selective bicyclic peptides showed a slight preference for nerve regeneration.
- Oriented DRG outgrowth was achieved in Anisogels with aligned, magneto-responsive fibers.
Conclusions:
- Bicyclic RGD peptides represent a new class of biomolecules for enhanced cell growth and nerve regeneration.
- PEG hydrogels modified with these peptides show potential as advanced aECM models.
- Integrin selectivity is crucial for optimizing biomaterial performance in tissue engineering applications.
