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Directed Neural Stem Cell Differentiation with a Functionalized Graphene Oxide Nanocomposite.
Cassandra L Weaver1,2,3, Xinyan Tracy Cui1,2,3
1Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
Advanced Healthcare Materials
|May 7, 2015
Summary
This study shows that a graphene oxide-poly(3,4-ethylenedioxythiophene) nanocomposite material can be customized to guide neural stem cell differentiation. This engineered scaffold improves neural stem cell behavior for potential therapeutic applications.
Area of Science:
- Biomaterials Science
- Neuroscience
- Tissue Engineering
Background:
- Neural stem cell (NSC) transplantation holds promise for nervous system repair, but therapeutic success is hindered by challenges in controlling cell survival and differentiation.
- Conducting polymers offer electrical interfacing with cells but lack facile covalent modification for biomolecule patterning.
- Engineered scaffolds are needed to direct NSC behavior and overcome transplantation limitations.
Purpose of the Study:
- To investigate the neural stem cell (NSC) scaffolding performance of a poly(3,4-ethylenedioxythiophene) (PEDOT) and graphene oxide (GO) nanocomposite (GO/PEDOT).
- To assess the GO/PEDOT material's ability to support NSC differentiation and enable surface patterning of biomolecules for therapeutic applications.
Main Methods:
- A novel GO/PEDOT nanocomposite was synthesized and characterized for its biocompatibility and ability to support NSC differentiation.
- Carboxylic acid groups on GO were utilized for covalent cross-linking of biomolecules (interferon-γ and platelet-derived growth factor) via carbodiimide chemistry.
- NSC differentiation was evaluated on modified and unmodified GO/PEDOT surfaces to determine lineage-specific outcomes.
Main Results:
- The GO/PEDOT nanocomposite material demonstrated low toxicity and promoted NSC differentiation towards the neuronal lineage.
- Surface modification with interferon-γ (IFNγ) selectively enhanced neuronal differentiation.
- Surface modification with platelet-derived growth factor (PDGF) selectively promoted oligodendrocyte differentiation.
Conclusions:
- The GO/PEDOT nanocomposite is a customizable and effective material for NSC scaffolding applications.
- Covalent surface modification of GO/PEDOT allows for controlled differentiation of NSCs into specific neural lineages.
- This engineered material shows significant potential for enhancing NSC-based therapies for neurological disorders.
