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    Engineered Biomaterials for Human Neural Stem Cell Applications

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    Genre
    Thesis/Dissertation
    Date
    2019
    Author
    Ma, Weili
    Advisor
    Suh, Won H.
    Committee member
    Lelkes, Peter I.
    Pleshko, Nancy
    Hu, Wenhui
    Department
    Bioengineering
    Subject
    Bioengineering
    Materials Science
    Hyaluronic Acid
    Hydrogel
    Neural Stem Cells
    Peptide
    Retinoic Acid
    Stem Cell Differentiation
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/3248
    
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    DOI
    http://dx.doi.org/10.34944/dspace/3230
    Abstract
    Within the last decade, neurodegenerative diseases such as Alzheimer’s and Parkinson’s have emerged as one of the top 5 leading causes of death globally, and there is currently no cure. All neurodegenerative diseases lead to loss of the functional cells in the nervous system, the neurons. One therapeutic approach is to replace the damaged and lost neurons with new, healthy neurons. Unfortunately, this is a difficult endeavor since mature neurons are not capable of cell division. Instead, researchers are turning to neural stem cells, which are able to self-renew and be rapidly expanded before being differentiated into functional cell phenotypes, such as neurons, allowing for large numbers of cells to be generated in vitro. Controlled differentiation of human neural stem cells into new neurons has been of interest due to the immense potential for improving clinical outcomes. Adult neural stem cell behavior, however, is not well understood and the transplanted stem cells are at risk for tumorigenesis. The focus of this dissertation is the development of engineered biomaterials as tools to study human neural stem cell behavior and neurogenesis (differentiation). A novel cell penetrating peptide was developed to enhance intracellular delivery of retinoic acid, a bioactive lipid known to induce differentiation. A hydrogel platform fabricated from hyaluronic acid, a naturally-occurring polysaccharide found in brain extracellular space, was designed to serve as a biomimetic soft substrate with similar mechanical properties to the brain. The biological behavior of the stem cells was characterized in response to chemical and physical cues.
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